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1 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 general description the aat2400/2401 is a highly integrated, high efficiency white led backlight solution for large size lcd panels used in lcd tvs. to accommodate power requirements, the solution consists of two devices, a master device (aat2400) and a slave device (aat2401). the devices operate from a regulated 24v dc power supply. the master device supplies a 40v rail to drive 10 series leds with a typical v f of 3.6v. 16 precision current sinks split evenly between the master and slave devices provide constant current drive for up to 160 white leds. a spi compatible interface operates up to 30mhz, allow - ing fast, independent digital control of each current sink. full scale led current is programmed from 30ma to 100ma using an external resistor. led brightness varia - tion is compensated by setting relative current sink mag - nitudes with an 8-bit dot correction register for each led current sink. the aat2400/2401 provides a 12-bit programmable phase delay per led current sink that can be used to synchronize the leds to v sync . device addressing pro - vides for up to 256 led strings. a 12-bit programmable gray scale pwm brightness setting is generated via a clock from a pll synchronized to v sync , or from the external gsclk pin. the aat2400/2401 provides fault handling and fault reporting through the interface. if leds are shorted on one or more strings, the current sinks will maintain operation due to the high voltage rating of the outputs. however, a fault condition will be reported on the open drain fault pin. similarly, if an open circuit is detected or an over-temperature condition arises, the fault is report - ed on the fault pin. when a fault is reported, the nature of the fault condition can be read through the serial interface. the aat2400 boost converter provides an output voltage regulated by the string with the highest voltage require - ment allowing a wide range of led characteristics, while maintaining the lowest possible power dissipation. the boost switching frequency is 600khz to allow for opti - mum efficiency with the smallest external filter. alternatively, the device may be synchronized to an external clock. current mode control provides fast response to line and load transients. thermal protection circuitry shuts down the boost converter and the current sinks in the event of an over-temperature condition. the aat2400 and aat2401 are available in pb-free, ther - mally enhanced 36-pin 5x5mm tqfn packages. features? v in range: 10.8v C 28v ? integrated boost converter ? v out(max) : 40v ? i out(max) : 1.6a ? up to 95% efficiency ? switching frequency options ? 600 khz ? sync to external clock (optional) ? 16 led current sinks up to 100ma/ch ? 2.5% accuracy (60ma) ? 2.0% matching (60ma) ? spi interface ? digitally programmable individual channels ? up to 30mhz clock speed ? read/write registers ? precision pwm digital brightness control ? 12-bit individual gray scale pwm brightness ? 12-bit individual channel phase delay ? 8-bit individual current setting (dot correction) ? v sync derived internal oscillator ? v sync pwm and delay synchronization ? device addressing ? 16 possible address settings ? up to 256 current sinks ? fault reporting ? integrated fault protection ? open/short led(s) ? current limit protection ? over-voltage protection ? over-temperature protection ? soft-start to minimize inrush current ? tqfn55-36 low profile package ? -40c to +85c temperature range applications ? large size lcd tv, panels ? white led backlight downloaded from: http:///
2 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 typical application circuit csfbo cs9 cs10 cs11 cs12 cs13 cs14 cs15 cs16 sdi sclk rset spi vsync gsclk r7 cs sdo addr0 addr1 fault 2k vcc v in 24v 2.2 f 4. 7 f vinvcc en lx 12 .1 k ovp d1 60v 3a v in 24v aat2400 aat2401 2k 18nf 44 2k cs1 cs2 cs3 cs4 cs5 cs6 cs7 cs8 l1 10h v out comp sdi sclk sync 4.7 f 50v pgnd sgnd rset spi vin 2.2 f vcc agnd vsync gsclk r1 en cs sdo addr0 addr1 4. 7 f csfb fault 2k vcc 0.68 f pll 0.68 f pll dgnd pgnd sgnd agnd dgnd 10f 12 .1 k 10f 12 .1 k ovp 2.2 f vccio vccio 2.2 f 10k csfbi downloaded from: http:///
3 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 1. unused current sink channels must be terminated. refer to the channel disable paragraph in the application information section of this datasheet. aat2400 pin descriptions pin # symbol function description 1 cs5 o output current sink 5 1 . 2 cs6 o output current sink 6 1 . 3 cs7 o output current sink 7 1 . 4 cs8 o output current sink 8 1 . 5 sgnd gnd current sink ground. connect to gnd as closely as possible to the device. 6 cs4 o output current sink 4 1 . 7 cs3 o output current sink 3 1 . 8 cs2 o output current sink 2 1 . 9 cs1 o output current sink 1 1 . 10 rset i resistor for setting maximum current sink dc level. connect a resistor between this pin and agnd pin. 11 en i logic high enable pin. apply a logic high voltage after power is applied to vin or connect to vin through a rc time delay network to enable the device. 12 fault o open drain fault signal. pull up to logic supply with external resistor. 13 pll i/o pll compensation. connect associated network between this pin and agnd. 14, 32 agnd gnd analog ground. connect to gnd with one single connection. 15 dgnd gnd digital ground. connect to gnd as closely as possible to the device. 16 vin i ic and boost converter power supply. 17 vcc i/o internally regulated power supply. decouple with 2.2f/6.3v capacitor to agnd. 18 vccio i/o internally regulated power supply (3.3v) for sdo. decouple with 2.2f/6.3v capacitor to dgnd. 19 sdo o spi interface serial data output. 20 comp i boost converter compensation. connect external resistor and capacitor to this pin and agnd. 21 csfb i current sink feedback. connect to slave device csfbo with a 10k pull-down resistor. 22 sync i connect to an external clock for synchronization connect to pgnd if not used. 23 n/c no connect 24, 25 lx o switching node of boost converter. connect a 10h inductor between this pin and vin. connect a schottky diode between this pin and the boost output capacitor. 26, 27 pgnd gnd power ground of boost converter integrated nmos switching device. boost output capacitor must be placed very close to this pin. 28 addr1 i msb device address. connect to vcc, gnd, sdi or leave unconnected to set address. 29 addr0 i lsb device address. connect to vcc, gnd, sdi or leave unconnected to set address. 30 vsync i vertical sync. pwm operation synchronization and reset. 31 gsclk i pwm clock. apply clock or connect to gnd if not used. 33 sclk i spi interface serial clock. 34 sdi i spi interface serial data input. 35 csb i spi interface active low chip select. 36 ovp i over-voltage protection pin. connect resistive divider between vout and gnd. ep exposed paddle. connect to pcb gnd plane. pcb paddle heat sinking should maintain accept- able junction temperature. downloaded from: http:///
4 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 1. unused current sink channels must be terminated. refer to the channel disable paragraph in the application information section of this datasheet. aat2401 pin descriptions pin # symbol function description 1 cs5 o output current sink 5 1 . 2 cs6 o output current sink 6 1 . 3 cs7 o output current sink 7 1 . 4 cs8 o output current sink 8 1 . 5 sgnd gnd current sink ground. connect to gnd as closely as possible to the device. 6 cs4 o output current sink 4 1 . 7 cs3 o output current sink 3 1 . 8 cs2 o output current sink 2 1 . 9 cs1 o output current sink 1 1 . 10 rset i resistor for setting maximum current sink dc level. connect a resistor between this pin and agnd pin. 11 en i logic high enable pin. apply a logic high voltage after power is applied to the vin. or con- nect to vin through a rc time delay network to enable the device. 12 fault o open drain fault signal. pull up to logic supply with external resistor. 13 pll i/o pll compensation. connect associated network between this pin and agnd. 14, 32 agnd gnd analog ground. connect to gnd with one single connection. 15 dgnd gnd digital ground. connect to gnd as closely as possible to the device. 16 vin i ic and boost converter power supply. 17 vcc i/o internally regulated power supply. decouple with 2.2f/6.3v capacitor to agnd. 18 vccio i/o internally regulated power supply (3.3v) for sdo. decouple with 2.2f/6.3v capacitor to dgnd. 19 sdo o spi interface serial data output. 20, 22, 24, 25, 26, 27 agnd gnd connect to gnd with one single connection. 21 csfbo o current sink feedback output. connect to master device csfb with a 10k pull-down resistor 23 csfbi i current sense feedback input. connect to vcc if not used. 28 addr1 i msb device address. connect to vcc, gnd, sdi or leave unconnected to set address. 29 addr0 i lsb device address. connect to vcc, gnd, sdi or leave unconnected to set address. 30 vsync i vertical sync. pwm operation synchronization and reset. 31 gsclk i pwm clock. apply clock or connect to gnd if not used. 33 sclk i spi interface serial clock. 34 sdi i spi interface serial data input. 35 csb i spi interface active low chip select. 36 ovp i over-voltage protection pin. connect resistive divider between vout and gnd. ep exposed paddle. connect to pcb gnd plane. pcb paddle heat sinking should maintain ac- ceptable junction temperature. downloaded from: http:///
5 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. based on long-term current density limitation. 3. mounted on an fr4 board. 4. derate 23mw/c above 25c. pin configuration aat2400 aat2401 tqfn55-36 tqfn55-36 (top view) (top view) 12 3 4 5 6 36 35 34 33 32 28 10 11 12 13 14 15 2726 25 24 23 22 cs5 cs6cs7 cs8 sgnd cs4 rset en fault pll agnd dgnd lx lxn/c sync pgnd pgnd agnd addr1 sclk sdi csb ovp 31 30 29 addr0 vsync gsclk 16 17 18 vin vcc vccio 2120 19 csfb compsdo 78 9 cs3 cs2cs1 12 3 4 5 6 36 35 34 33 32 28 10 11 12 13 14 15 2726 25 24 23 22 cs5 cs6cs7 cs8 sgnd cs4 rset en fault pll agnd dgnd agnd agndcsfb1 agnd agnd agnd agnd addr1 sclk sdi csb ovp 31 30 29 addr0 vsync gsclk 16 17 18 vin vcc vccio 2120 19 csfbo agndsdo 78 9 cs3 cs2cs1 absolute maximum ratings 1 t a = 25 o c unless otherwise noted. symbol description value units v lx lx voltage to gnd 45 v v in,en input voltage, en to gnd -0.3 to 30 v csx output current sinks cs1 C cs16 to gnd -0.3 to 35 v cc low voltage pin to gnd -0.3 to 6.0 ovp, comp, sync, vsync, gsclk, rset, sdi, sdo, sclk, cs b, pll, flaut, csfb, csfbi, csfbo, addr0, addr1 ovp, comp, sync, vsync, gsclk, rset, sdi, sdo, sclk, cs b, pll, flaut, csfb, csfbi, csfbo, addr0, addr1 voltage to gnd -0.3 to v cc + 0.3 i out maximum dc output current 2 1800 ma t j maximum junction operating temperature -40 to +150 c t lead maximum soldering temperature (at leads, 10 sec) 300 thermal information 3 symbol description value units ja thermal resistance 4 23 o c/w p d maximum power dissipation 4.3 w downloaded from: http:///
6 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 electrical characteristics 1 v in =24v; c in = 4.7f, c out = 4.7f; c vcc = 2.2f; l 1 = 10h; r set =10.2k (i csx = 60ma); t a = -40 o c to 85 o c unless otherwise noted. typical values are at t a = 25 o c. symbol description conditions min typ max units power supply, current sinks v in input voltage range 10.8 28.0 v v uvlo under-voltage threshold v in rising 10 v hysteresis 500 mv v in falling 8.5 v v out output voltage range v in = 10.8 to 28.0v v in + 3v 40 v i q_2400 quiescent current of aat2400 (no switching) i csx = 0ma, v csx = 1v 3 ma i q_2401 quiescent current of aat2401 i csx = 0ma, v csx = 1v 5 ma i sd vin pin shutdown current csn = in, en = logic low; includes csx + lx leakage current 25 a i en_leakage enable leakage current en = 5v 5 a i addr0 , i addr1 input current to addr0 and addr1 addr0 = 5v, addr1 = 5v 100 a v ovp over-voltage threshold v out rising 1.1 1.2 1.3 v over-voltage hysteresis v out falling 100 mv r ds(on)lo low side switch on-resistance 180 m? i limit low side switch current limit 4.5 6.5 a f osc oscillator frequency 500 600 700 khz f sync sync frequency 300 900 khz t ss soft-start v out = 35v 1 ms i csx / i rset current set ratio i csx /i rset , v rset = 0.6v nom, full scale dot correction 1024 a/a v cx current sink voltage en = logic high, i csx = 60ma (r set = 10.2k ?) 0.8 v i csx current sink accuracy i csx = 60ma -2.5 +2.5 % i csx-matching current matching between any sink channel i csx = 60ma -2 +2 % v cx(short) shorted diode(s) detection threshold i csx = 60ma 3v logic level inputs: en, sync, vsync, gsclk, sdi, sclk, csb v i(l) input logic threshold low 0.4 v v i(h) input logic threshold high 1.4 v v i(h)_en enable logic threshold high 2.5 v downloaded from: http:///
7 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 electrical characteristics 1 v in =24v; c in = 4.7f, c out = 4.7f; c vcc = 2.2f; l 1 = 4.2h; r set =10.2k (i csx = 60ma); t a = -40 o c to 85 o c unless otherwise noted. typical values are at t a = 25 o c. symbol description conditions min typ max units logic level outputs: sdo, fault vccio vcc i/o voltage range no load 2.97 3.3 3.63 v v o(h) output logic level high i source = 4ma, v ccio = 3.3v 2.4 v v o(l) output logic level low i sink = -4ma 0.4 v v faultlow fault logic output low 0.4 v i sink fault logic hi leakage v fault = 5.5v 1 a interface: vsync, gsclk f vsync vsync maximum frequency 55 250 hz f gsclk gsclk frequency 1 mhz t setup(su_vs) minimum vsync setup time gsclk, vsync 24 ns t hold(h_vs) minimum vsync hold time gsclk, vsync 24 ns t gs(hi/lo_ min) minimum gsclk clock high/low time 32 ns t sclk(hi/lo_ min) minimum sclk clock high/low time 32 ns t vs(hi/lo_ min) minimum vsync clock high/low time 32 ns spi interface: sdi, sdo, sclk, csb f max maximum clock frequency 30 mhz t setup(su_ sdi) minimum sdi setup time sdi, sclk 24 ns t setup(su_cs) minimum csb setup time csb, sdi 24 ns t hold(h_ sdi) minimum sdi hold time sdi, sclk 24 ns thermal protection t j2(sd) t j thermal shutdown threshold reset thermal threshold 140 c t j2(hys) t j thermal shutdown hysteresis ctl1 and ctl2 registers are reset to 0 15 c t j1(sd) t j thermal warning threshold warning thermal threshold 120 c t j1(hys) t j thermal warning hysteresis 15 c downloaded from: http:///
8 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 spi timing diagram t se tu p(su-cs) cs b sc lk t se tu p( su -s di ) t hold (h -s di ) sd i / sd o downloaded from: http:///
9 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 typical characteristics aat2400 boost converter efficiency vs. output current (v out = 38v) output current (a) efficiency (%) 0. 00 .2 0. 40 .6 0. 81 .0 1. 21 .4 1. 61 .8 2.0 86 88 90 92 94 96 98 v in = 26v v in = 24v v in = 22v led current vs. input voltage (60ma/ch) input voltage (v) led current (ma) 21.6 22.4 23.2 24.0 24.8 25.6 26.4 27.2 28.0 59.80 59.85 59.90 59.95 60.00 60.05 60.10 60.15 60.20 sum of aat2400 and aat2401 quiescent current vs. temperature (v in = 24v) temperature (c) quiescent current (ma) -4 01 06 0 -1 53 58 5 0 1 2 3 4 5 6 7 8 9 sum of aat2400 and aat2401 shutdown current vs. temperature (v in = 24v) temperature (c) shutdown current (a) -4 01 06 0 -1 53 58 5 0 5 10 15 20 25 30 35 40 output current matching vs. temperature (60ma/ch) temperature (c) output current (ma) -4 01 06 0 -1 53 58 5 55 56 57 58 59 60 61 62 63 64 65 aat2400 boost converter low side on-resistance vs. temperature temperature (c low side on resistance (m? -4 01 06 0 -1 53 58 5 0 50 100 150 200 250 300 350 downloaded from: http:///
10 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 typical characteristics switching frequency vs. temperature temperature (c) switching frequency (khz) -4 01 06 0 -1 53 58 5 560 570 580 590 600 610 620 630 640 turn on (v in = 24v; 50ma/ch) time (1ms/div) sdi (2v/div) v out (10v/div) i out (500ma/div) v sink (5v/div) 800mv 0ma 24v 0v turn off (v in = 24v; 50ma/ch) time (1ms/div) sdi (2v/div) v out (10v/div) i out (500ma/div) v sink (10v/div) 0v 34v 800mv 0ma uvlo falling vs. temperature temperature (c) uvlo falling (v) -4 01 06 0 -1 53 58 5 8.4 8.6 8.8 9.0 9.2 9.4 9.6 9.8 10.0 uvlo rising vs. temperature temperature (c) uvlo rising (v) -4 01 06 0 -1 53 58 5 8.4 8.6 8.8 9.0 9.2 9.4 9.6 9.8 10.0 v ccio vs. i vccio (v in = 12v) i cc (ma) v ccio (v) 20 04 0 10 50 30 3.00 3.10 3.20 3.30 3.40 3.50 3.60 85c25c -40c downloaded from: http:///
11 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 functional block diagram aat2400 (master) te m perature de te ct sp i inte rf ac e 7- bi t dot co rre ct io n fa ul t condi ti on r epor ti ng 4096 x pl l mu x co nt ro l co nt ro l co nt ro l cont ro l co nt ro l co nt ro l co nt ro l co nt ro l cs 1 cs 2 cs 3 cs 4 cs 5 cs 6 cs 7 cs 8 8x31 7- bi t dot co rre ct io n 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 8-bi t dot co rre ct io n 7- bi t dot co rre ct io n 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 12 -b it de la y ti me 7- bi t dot co rre ct io n 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 12 -b it gr ay sc ale pw m 8 pw m logi c co mp ov p en lx sc lk sd i cs b sd o a ddr 0 a ddr 1 vsyn c gs cl k rset sg nd vf b fa ul t de te ct syn c cs fb 16 pg nd ag nd fa ul t pl l dgnd v cci o vi n linear re gu la to r vc c downloaded from: http:///
12 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 aat2401 (slave) te m perature de te ct sp i inte rf ac e 7-bi t dot co rre ct io n fa ul t condi ti on re por ti ng 4096 x pl l mu x cont ro l co nt ro l cont ro l cont ro l co nt ro l co nt ro l co nt ro l co nt ro l cs 9 cs 10 cs 11 cs 12 cs 13 cs 14 cs 15 cs 16 8x31 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 7-bi t dot co rr ec ti on 7-bi t dot co rre ct io n 7-bi t dot co rre ct io n 8- bi t dot co rre ct io n 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 7-bi t dot co rr ec ti on 7-bi t dot co rre ct io n 7-bi t dot co rre ct io n 12 -b it de la y ti me 7-bi t dot co rre ct io n 7- bi t dot co rr ec ti on 7-bi t dot co rr ec ti on 7- bi t dot co rre ct io n 7-bi t dot co rr ec ti on 7-bi t dot co rre ct io n 7-bi t dot co rre ct io n 12 -b it gr ay sc ale pw m 8 en sc lk sd i cs b sd o addr 0 addr 1 vsyn c gs cl k rset sg nd vf b fa ul t de te ct 16 ag nd cs fb cs fb o fa ul t vcci o vi n linear re gu la to r pl l dgnd ov p vc c cs fb i downloaded from: http:///
13 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 functional description the aat2400 consists of a high efficiency dc/dc boost controller, an integrated slew rate controlled input dis - connect mosfet switch, and a mosfet power switch. a high voltage rectifier, power inductor, output capacitor, feedback compensation network, and ovp resistor divid - er network are required to implement a dc/dc boost converter. the aat2400s boost controller is designed to deliver 1600ma up to 40v. it can drive a total of 16 current regulated sinks (8 from its own and 8 from aat2401) with 10 hb white leds connected in series at each channel. the maximum led sink current can be set by an exter - nal resistor. each current sink can be programmed through the spi interface. each sink allows independent control with different registers (dot correction, gray scale, delay, on/off control configuration). aat2400 and aat2401 both provide one linear regulator for vccio supply. control loop the aat2400 provides the benefits of current mode con - trol with a simple feedback loop. the device maintains exceptional dc regulation, transient response, and cycle- by-cycle current limit with additional rc compensation components. the aat2400 modulates the power mosfet switching current in response to changes in output volt - age (led voltage). this allows the voltage loop to directly program the required inductor current in response to changes in the output load. the switching cycle initiates when the n-channel mosfet is turned on and current ramps up in the inductor. the on interval is terminated when the feedback signal crossover the falling edge of the saw wave from the pwm modulator. during the off inter - val, the inductor discharges the energy (inductor ramps down) until the lower threshold, or zero inductor current, is reached. the lower current is equal to the peak current minus a preset hysteresis threshold which determines the inductor ripple current. the peak current is adjusted by the controller until the output current requirement is met. the magnitude of the feedback error signal determines the average input current. therefore, the aat2400 con - troller implements a programmed current source con - nected to the output capacitor and load resistor. there is no right-half plane zero, and loop stability is achieved with simple rc compensation components. soft start / enable the input disconnect switch is activated when a valid supply voltage is present and the en/set pin is strobed high. slew rate control on the input disconnect switch ensures minimal inrush current as the output voltage is charged to the input voltage, prior to switching of the n-channel power mosfet. a monotonic turn-on is guar - anteed by the built-in soft-start circuitry, which elimi - nates output current overshoot across the full input volt - age range and over all load conditions. current limit and over-temperature protection the switching of the n-channel mosfet terminates when a current limit of 6.5a (max) is exceeded. this minimizes power dissipation and component stresses under over - load and short-circuit conditions. switching resumes when the current decays below the current limit. thermal protection disables the aat2400/aat2401 when the internal power dissipation causes the junction tempera - ture to reach the thermal limit threshold (140c, nomi - nal). when the thermal threshold is reached, the control register, ctl1 or ctl2, is reset to 00h and all current sinks are disabled. when the aat2400's thermal thresh - old is reached, the boost converter is also disabled. over-voltage protection over-voltage protection prevents damage to the aat2400 during open-circuit on any led channel sinks causing high output voltage conditions. an over-voltage event is defined as a condition where the voltage on the ovp pin exceeds the over-voltage threshold limit (v ovp = 1.2v typical). when the voltage on the ovp pin has reached the threshold limit, the converter stops switching and the output voltage decays. switching resumes when the voltage on the ovp pin drops below the lower hysteresis limit, maintaining an average output voltage between the upper and lower ovp thresholds multiplied by the resistor divider scaling factor. under-voltage lockout internal bias of all circuits is controlled via the v in input. under-voltage lockout (uvlo) guarantees sufficient vin bias and proper operation of all internal circuitry prior to soft start. downloaded from: http:///
14 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 current sink control each current sink has an independent property pro - grammed by the following registers. the aat2400 con - tains current sinks 1 through 8. the aat2401 contains current sinks 9 through 16. dot correction each current sink can have a separate current setting to compensate for relative led brightness. this register has a default setting of half scale. addr: 00h to 1eh dotn: dot correction current setting bit bit name default access description 7:0 dotn 7:0 7fh r/w 8-bit dot word table 1: dot correction current setting. gray scale each current sink has a unique pwm duty cycle setting to provide a given brightness. the gray scale register is a 12-bit word divided into an 8-bit word and a 4-bit word. this register has a default setting of ? scale, or 0400h. only even register addresses are used starting from 40h to 7eh. addr: 40h to 7eh gsn lsb: gray scale setting lsb bit bit name default access description 7:0 gsn 7:0 00h r/w 8 lsbs of 12-bit gs word table 2: gray scale setting lsb. addr: 40h to 7eh gsn msb: gray scale setting msb bit bit name default access description 3:0 gsn 11:8 04h r/w 4 msbs of 12-bit gs word table 3: gray scale setting msb. delay each current sink has a unique delay time from the start of v sync to when the current sink pwm cycle begins. the delay register is a 12-bit word divided into an 8-bit word and a 4-bit word. this register has a default setting of 0. only even register addresses are used. starting from 80h, every other even register is programmed up to beh. addr: 80h to beh dlyn lsb: delay setting lsb bit bit name default access description 7:0 dlyn 7:0 00h r/w 8 lsbs of 12-bit gs word table 4: delay setting lsb. addr: 80h to beh dlyn msb: delay setting msb bit bit name default access description 3:0 dlyn 11:8 00h r/w 4 msbs of 12- bit gs word table 5: delay setting msb. current sink on/off each current sink can be independently enabled or dis - abled. in the event of an over temperature condition, this register is reset to 00h and must be reprogrammed to resume operation. it has a default setting of 00h (all sinks are off). addr: c0h ctl1: this register enables or disables each current sink independently bit bit name default access description 7:0 cs8:cs1 00h r/w 0 = current sink off, 1= current sink on table 6: ctl1 setting. addr: c2h ctl2: this register enables or disables each current sink independently bit bit name default access description 7:0 cs16:cs9 00h r/w 0 = current sink off, 1= current sink on table 7: ctl2 setting. downloaded from: http:///
15 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 pwm timing the pwm on time of a given current sink is set by the gray scale and delay registers according to the following timing diagram. t vsync is the period of the v sync signal, typically 1/120 hz, or 8 1/3 ms, but t vsync can be as short as 500 s. gsclk is either derived from v sync , where f gsclk = 4096 x f vsync , or supplied by an external signal at the gsclk pin. t dly is the number between 0 and 4095 of the dly register, and is the number of gsclk rising edges between the rising edge of v sync and the rising edge of the pwm signal. likewise, t pwm is the number between 0 and 4095 of the gs register, and is the number of gsclk periods of the pwm on time. the current sink conducts during the pwm on time (shown high in the following timing diagram). if t pwm is not met by the end of t vsync , the pwm on time will overflow onto the next t vsync period. led % brightness = t pwm /4096 x 100. device address setup the device address is set by the two address pins, addr1 and addr0. each address pin has four decode levels resulting in 16 possible address settings. the address is programmed by connecting addr1 and addr0 to vcc, gnd, sdi, or by leaving the addr pin unconnected. the master and slave devices can be pro - grammed with the same device address. the register addressing will automatically select the appropriate mas - ter/slave device for the addressed current sink. pw m gs cl k v sy nc t vsync t dl y t pwm 1 4 096 figure 1: pwm timing diagram. device address spi address: addr1 addr0 decoding of address set resistors bit bit name description 1:0 addr0 00: connect to vcc; 01: open; 10: connect to sdi; 11: connect to gnd 3:2 addr1 00: connect to vcc; 01: open; 10: connect to sdi; 11: connect to gnd table 8: device address settings. downloaded from: http:///
16 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 coniguration bits address (hex) addr1 addr0 6 5 4 3 2 1 0 w vcc vcc 1 0 1 0 0 0 0 0 a0 vcc open 1 0 1 0 0 0 1 0 a2 vcc sdi 1 0 1 0 0 1 0 0 a4 vcc gnd 1 0 1 0 0 1 1 0 a6 open vcc 1 0 1 0 1 0 0 0 a8 open open 1 0 1 0 1 0 1 0 aa open sdi 1 0 1 0 1 1 0 0 ac open gnd 1 0 1 0 1 1 1 0 ae sdi vcc 1 0 1 1 0 0 0 0 b0 sdi open 1 0 1 1 0 0 1 0 b2 sdi sdi 1 0 1 1 0 1 0 0 b4 sdi gnd 1 0 1 1 0 1 1 0 b6 gnd vcc 1 0 1 1 1 0 0 0 b8 gnd open 1 0 1 1 1 0 1 0 ba gnd sdi 1 0 1 1 1 1 0 0 bc gnd gnd 1 0 1 1 1 1 1 0 be table 9: device address write table and configuration. coniguration bits address (hex) addr1 addr0 6 5 4 3 2 1 0 r vcc vcc 1 0 1 0 0 0 0 1 a1 vcc open 1 0 1 0 0 0 1 1 a3 vcc sdi 1 0 1 0 0 1 0 1 a5 vcc gnd 1 0 1 0 0 1 1 1 a7 open vcc 1 0 1 0 1 0 0 1 a9 open open 1 0 1 0 1 0 1 1 ab open sdi 1 0 1 0 1 1 0 1 ad open gnd 1 0 1 0 1 1 1 1 af sdi vcc 1 0 1 1 0 0 0 1 b1 sdi open 1 0 1 1 0 0 1 1 b3 sdi sdi 1 0 1 1 0 1 0 1 b5 sdi gnd 1 0 1 1 0 1 1 1 b7 gnd vcc 1 0 1 1 1 0 0 1 b9 gnd open 1 0 1 1 1 0 1 1 bb gnd sdi 1 0 1 1 1 1 0 1 bd gnd gnd 1 0 1 1 1 1 1 1 bf table 10: device address read table and configuration. downloaded from: http:///
17 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 fault reporting each device possesses fault reporting registers and a fault flag. an open or short condition on each current sink is reported in one of four fault registers. an open fault condition is only monitored for led current sink on- times of greater than 10s. an over-temperature condi - tion is reported in one of two registers. these conditions may selectively be reported on the open drain fault pin. bits in separate fault reporting registers can be set or reset to enable or disable a particular fault condition. the shorted led fault condition is handled in a special way because of the uncertainty associated with shorted leds and the led forward voltage variation. to detect a shorted led fault in the system, all led channels should be programmed to be conducting for at least 1ms. the fault flag will only be valid 1ms after a given led string has begun conducting. if the fault flag becomes active, the fault registers must be read while the channels remain conducting. the fault reporting register defaults to the condition of reporting the short detect, so this register must be cleared prior to checking for shorted leds. severe led forward voltage (v f ) mismatches between channels will also be reported as a short fault condition with the lower v f channels indicating the fault condition. fault registers the fault registers can be read anytime during opera - tion. addr: e0h fault1: this register reports fault conditions and high voltage cs pins bit bit name default access description 1:0 cs1 fault 00h r 00: no fault, 01: open, 10: short 3:2 cs2 fault 00h r 00: no fault, 01: open, 10: short 5:4 cs3 fault 00h r 00: no fault, 01: open, 10: short 7:6 cs4 fault 00h r 00: no fault, 01: open, 10: short table 11: fault1 register settings. addr: e2h fault2: this register reports fault conditions and high voltage cs pins bit bit name default access description 1:0 cs5 fault 00h r 00: no fault, 01: open, 10: short 3:2 cs6 fault 00h r 00: no fault, 01: open, 10: short 5:4 cs7 fault 00h r 00: no fault, 01: open, 10: short 7:6 cs8 fault 00h r 00: no fault, 01: open, 10: short table 12: fault2 register settings. addr: e4h fault3: this register reports fault conditions and high voltage cs pins bit bit name default access description 1:0 cs9 fault 00h r 00: no fault, 01: open, 10: short 3:2 cs10 fault 00h r 00: no fault, 01: open, 10: short 5:4 cs11 fault 00h r 00: no fault, 01: open, 10: short 7:6 cs12 fault 00h r 00: no fault, 01: open, 10: short table 13: fault3 register settings. addr: e6h fault4: this register reports fault conditions and high voltage cs pins bit bit name default access description 1:0 cs13 fault 00h r 00: no fault, 01: open, 10: short 3:2 cs14 fault 00h r 00: no fault, 01: open, 10: short 5:4 cs15 fault 00h r 00: no fault, 01: open, 10: short 7:6 cs16 fault 00h r 00: no fault, 01: open, 10: short table 14: fault4 register settings. downloaded from: http:///
18 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 temperature fault conditions two thermal limits are reported in each aat2400/2401 device. the first thermal limit serves as a warning that the device is heating up. when this condition is reported, the system can compensate by lowering the current lev - els of the current sinks. the second thermal limit is the maximum temperature allowed. when this temperature is reached, the control registers are reset to 0 which dis - ables all current sinks. in addition, the boost converter in the master device is disabled. to resume operation, the control registers must be reset, and all of the configura - tion registers must be reprogrammed, since data reten - tion at the maximum temperature is not guaranteed. addr: e8h otmp1: reports the temperature condition of the master ic (cs8 to cs1) bit bit name default access description 1:0 otmp 1 00h r 00: tj < t1 01: t1 < tj < t2 11: t2 < tj 2 conig 0h r/w 0: report t1 and t2 thermal limits on fault pin 1: report only t2 ther - mal limit on fault pin table 15: otmp1 settings. addr: eah otmp2: reports the temperature condition of the slave ic (cs16 to cs9) bit bit name default access description 1:0 otmp 2 00h r 00: tj < t1 01: t1 < tj < t2 11: t2 < tj 2 conig 0h r/w 0: report t1 and t2 thermal limits on fault pin 1: report only t2 ther - mal limit on fault pin table 16: otmp2 settings. fault reporting registers each individual sinks fault reporting can be configured to the following cases: led string becomes open, led string becomes short completely, reporting both or report none. to turn this feature off, set two bits to 11. setting the two bits to 01 and 10 means reporting short condition only or reporting open condition only accordingly. to report both faulty conditions, set the two bits to 00. addr: f0h fault reporting 1: individual sink fault reporting bit bit name default access description 1:0 cs1 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 3:2 cs2 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 5:4 cs3 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 7:6 cs4 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. table 17: fault reporting register 1 settings. downloaded from: http:///
19 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 addr: f2h fault reporting 2: individual sink fault reporting bit bit name default access description 1:0 cs5 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 3:2 cs6 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 5:4 cs7 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 7:6 cs8 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. table 18: fault reporting register 2 settings. addr: f4h fault reporting 3: individual sink fault reporting bit bit name default access description 1:0 cs9 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 3:2 cs10 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 5:4 cs11 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 7:6 cs12 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. table 19: fault reporting register 3 settings. addr: f6h fault reporting 4: individual sink fault reporting bit bit name default access description 1:0 cs13 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 3:2 cs14 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 5:4 cs15 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. 7:6 cs16 fault 10h r/w 00: report both; 01: report short only; 10: report open only; 11: report none. table 20: fault reporting register 4 settings. serial peripheral interface (spi) the serial peripheral interface is a synchronous serial interface for address and data transfer at bit rates of up to 30mhz. it is configured in 8-bit bytes designed to interface with a standard spi bus on many microcon - trollers. four pins are used to communicate on the spi: sclk (synchronous clock), cs (chip select, to signify the start of a transfer), sdi (data input to the aat2400/2401 for write operations, latched on the rising edge of sclk), and sdo (data output from the aat2400/2401 for read operations, presented on the falling edge of sclk). data and address are always sent msb first. the first 8-bit byte of a transfer is always the device address. the second byte of a transfer is always the address of the register to be written to or read from. the subsequent bytes are one or more bytes of data. the lsb (bit 0) of the device address byte contains a bit that signifies a read or a write operation. if r/w is 0, one or more write cycles occur, and if r/w is 1, one or more read cycles occur. multi-byte transfers are similar to single byte transfers, except that the cs pin is held low, and additional sclk cycles are sent until the end of the burst. in multi-byte transfers, the registers are written to or read from in sequential order. after the end of the address space, the multi-byte transfer is terminated. downloaded from: http:///
20 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 spi single-byte write sd i sc lk sd o cs hi gh im pedanc e ?0 ? ?1 ? 7- bi t de vice ad dres sw ?1 ? ?0 ? 8- bi t re gi st er a ddres s r7 r6 r2 r0 r5 r1 r4 r3 a3 a2 a1 a0 d7 d6 d2 d0 d5 d1 d4 d3 8- bi t da ta wr i tt en in spi single-byte read ?0 ? ?1 ? a3 a2 a1 a0 ?1 ? r7 r6 7- bi t de vice ad dres s8 -b it re gi st er a ddres s r 8- bi t da ta r ead out sd i sc lk sd o cs hi gh im pedanc e hi gh im pedance or don? t ca re ?1 ? r2 r0 r5 r1 r4 r3 d7 d6 d2 d0 d5 d1 d4 d3 spi multi-byte write transfer sd i sc lk sd o cs hi gh im pedanc e de vice ad dr & w re gi st er ad dres s da ta byte n da ta byte n+ 1 da ta byte n+ m spi multi-byte read transfer sd i sc lk sd o cs hi gh im pedanc e de vice a ddr & r re gi st er a ddres s da ta byte n da ta byte n+ 1 da ta byte n+ m hi gh im pedan ce or don? t ca re downloaded from: http:///
21 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 application information channel disable if current sink channels on either the aat2400 or aat2401 are not used, they must be terminated. unused channels should have their corresponding bit in the ctl1 or ctl2 register set to zero. in applications where the aat2400/ aat2401 pair are used, unused channels may be tied to gnd or to vcc. in applications where the aat2401 is used alone, unused channels must be tied to vcc. led selection although the aat2400 and 2401 are specifically designed to drive high current white leds, the device can also be used to drive most types of leds with forward voltages ranging between 2.0v and 4.7v. since all current sinks are matched with low voltage dependence, the led-to- led brightness will be matched regardless of the indi - vidual led forward voltage (v f ) levels. it makes the aat2400 and 2401 a perfect combination for large lcd tv backlighting led applications. constant current setting the led current is controlled by the r set resistor. for maximum accuracy, a 1% tolerance resistor is recom - mended. table 21 shows the r set resistor value for aat2400 and 2401 for various led full-scale current levels. 1024(a/a) 0.6v i csx r set = i csx (ma) r set (k) 40 15.4 50 12.3 60 10.2 70 8.76 80 7.68 90 6.81 100 6.12 table 21: maximum led current and r set resistor values (1% resistor tolerance). over-voltage protection the over-voltage protection circuit consists of a resistor network connected from the output voltage to the ovp pin (see figure 2). this over voltage protection circuit prevents damage to the device when one of the 16 chan - nels has an open led circuit. the rest of the channels of aat2400 and aat2401 continue to operate. the resistor divider can be selected such that the over- voltage threshold occurs prior to the output reaching 45v (v out(max) ). the value of r5 should be selected from 10k to 20k to minimize switching losses without degrading noise immunity. v out(protection) v ovp r 4 = r 5 - 1 aat 2400 ov p ag nd c ou t r4 r5 v ou t figure 2: over-voltage protection circuit. if 10 leds are connected in series on one channel sink, the total v f from the wleds could be as high as 42v. therefore, using r5 = 12.1k and setting v out(protection) = 45v is recommended. selecting a 1% resistor, this results in r4 = 442k (rounded to the nearest standard 1% value). it is always recommended to use the same num - ber of wleds on each channel and set the appropriate over-voltage protection. failure to do so may cause any one of the 16 sink pins to exceed the absolute maximum rating voltage and permanently damage the device in case the channel is disconnected (open circuit failure). led brightness control the aat2400 and 2401 uses the spi interface to program and control led brightness. each channel sink current of the aat2400 and aat2401 can be changed successively to brighten or dim the led string in smooth transitions (i.e. dynamic local dimming or zone dimming), giving the user complete programmability and real-time control of led brightness to tune the picture background to a true- black and a true-white from the led technology. downloaded from: http:///
22 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 minimum and maximum practical settings for gray scale and delay registers when using the internally generated pll derived pwm timebase, the stability of the frequency on v sync defines the practical minimum and maximum settings for the gray scale and delay registers. as a rule, the minimum and maximum settings should be 4 counts away from full scale. in other words, the register settings should lie between 04h and 0ffbh. otherwise, the natural phase delay between jitter on v sync and the internal timebase may result in unexpected pwm timing. gray scale set to zero, however, always results in zero on time. selecting the schottky diode to ensure minimum forward voltage drop and no recov - ery, high voltage schottky diodes are recommended for the aat2400 boost converter. the output diode is select - ed to maintain acceptable efficiency and reasonable operating junction temperature under full load operating conditions. forward voltage (v f ) and package thermal resistance ( ja ) are the dominant factors in selecting a diode. the diode non-repetitive peak forward surge cur - rent rating (i fsm ) should be considered for high pulsed load applications. i fsm rating drops with increasing con - duction period. manufacturers datasheets should be reviewed carefully to verify reliability under peak loading conditions. the diodes published current rating may not reflect actual operating conditions and should be used only as a com - parative measure between similarly rated devices. 60v/3a rated schottky diodes are recommended for out - put voltages less than 45v (total v f and 100ma/sink application).estimating schottky diode power dissipation the switching period is divided between on and off time intervals: 1 f s = t on + t off = d + d during the on time, the n-channel power mosfet is conducting and storing energy in the boost inductor. during the off time, the n-channel power mosfet is not conducting. stored energy is transferred from the input battery and boost inductor to the output load through the output diode. duty cycle is defined as the on time divided by the total switching interval: t on t on + t off d = = t on f s the maximum duty cycle can be estimated from the relationship for a continuous mode boost converter. maximum duty cycle (d max ) is the duty cycle at minimum input voltage (v in(min) ): v out - v in(min) v out d max = the average diode current during the off time can be estimated: i out 1 - d max i av g(off) = the v f of the schottky diode can be estimated from the average current during the off time. the average diode current is equal to the output current: i av g(tot) = i out the average output current multiplied by the forward diode voltage determines the loss of the output diode: p loss(diode) = i av g(tot) v f = i out v f for continuous led currents, the diode junction tem - perature can then be estimated: t j(diode) = t amb + ja p loss(diode) external schottky diode junction temperature should be below 110c, and may vary depending on application and/or system guidelines. the diode ja can be mini - mized with additional metal pcb area on the cathode. however, adding additional heat-sinking metal around the anode may degrade emi performance. the reverse leakage current of the rectifier must be considered to maintain low quiescent (input) current and high effi - ciency under light load. the rectifier reverse current increases dramatically at elevated temperatures. downloaded from: http:///
23 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 manufacturer part number rated foward current (a) rated voltage (v) thermal resistance, ja , (c/w) case diode, inc. b360a 3a 60 100 sma on semi mbrd360 3a 60 80 dpak table 22: typical surface mount schottky rectifiers for various output loads (select t j < 110c in application circuit). selecting the boost inductor the aat2400 controller utilizes pwm control and the switching frequency is fixed. to maintain 600khz switch - ing frequency and stable operation, a 10h inductor is recommended. manufacturers specifications list both the inductor dc current rating, which is a thermal limita - tion, and peak inductor current rating, which is deter - mined by the saturation characteristics. measurements at full load and high ambient temperature should be per - formed to ensure that the inductor does not saturate or exhibit excessive temperature rise. the output inductor (l) is selected to avoid saturation at minimum input voltage and maximum output load condi - tions. worst-case peak current occurs at minimum input voltage (maximum duty cycle) and maximum load. at high load the switching frequency is somewhat dimin - ished, resulting in higher i peak . bench measurements are recommended to confirm actual i peak and to ensure that the inductor does not saturate at maximum led current and minimum input supply voltage. the rms current flowing through the boost inductor is equal to the dc plus ac ripple components. under worst case rms condi - tions, the current waveform is critically continuous. the resulting rms calculation yields worst case inductor loss. the rms current value should be compared against the inductor manufacturers temperature rise, or thermal degrading, guidelines: i peak 3 i rms = for a given inductor type, smaller inductor size leads to an increase in dcr winding resistance and, in most cases, increased thermal impedance. winding resistance degrades boost converter efficiency and increases the inductors operating temperature: p loss(l) = i 2 rms dcr manufacturer part number inductance (h) saturated rated current (a) dcr (m?) size (mm) lxwxh type cooper bussmann dr1040-100-r 10 4.4 26 10.3 x 10.5 x 4.0 shielded drum core cooper bussmann dr1050-100-r 10 4.58 18 10.3 x 10.5 x 5.0 shielded drum core sumida cdr12d43rnp-100m 10 6.3 18 12.4 x 12.4 x 4.5 shielded drum core sumida cdr10d48mnnp-100mc 10 5.5 32 10.3 x 10.3 x 5.0 shielded drum core sumida cdrh10d43rnp-100nc 10 5.2 26.1 10.5 x 10.8 x 4.5 shielded drum core sumida cdrh105rnp-100nc 10 4.45 26 10.3 x 10.5 x 5.0 shielded drum core tdk vlf10045t-100m4r3-pf 10 4.3 25 9.7 x 10.0 x 4.5 shielded drum core tdk rlf12545t-100m5r1-pf 10 6 12.4 12.8 x 12.5 x 4.7 shielded drum core wrth elektronik we-pd type ls - 100 10 4.2 25 12 x 12 x 4.5 shielded drum core table 23: typical suggested surface mount inductors. downloaded from: http:///
24 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 aat2400/2401 input capacitors in general, it is good design practice to place a decou - pling capacitor (input capacitor) between the in and gnd pins. an input capacitor in the range of 2.2f to 10f is recommended. a larger input capacitor in this application may be required for stability and transient response. multi-layer ceramic (mlc) capacitors provide small size and adequate capacitance, low parasitic equivalent series resistance (esr) and equivalent series inductance (esl). mlc capacitors of type x7r or x5r are good to ensure capacitance stability over the full operating tem - perature range. boost converter output capacitor selection for best performance, a low-esr aluminum electrolytic type capacitor is suggested for use with the aat2400 boost converter output. other capacitor dielectric types are compatible and may be used such as polymer cath - ode tantalum chip capacitors or low esr os-con (organ - ic semiconductor) capacitors. the voltage rating for a selected capacitor should exceed the greatest operating output voltage for the aat2400 boost converter. best engineering practices would recommend a capacitor volt - age rating of two times the maximum operating voltage, although any voltage rating above the maximum operat - ing output voltage of the boost converter is acceptable. pcb layout guidelines boost converter performance can be adversely affected by poor layout. possible impact includes high input and output voltage ripple, poor emi performance, and reduced operating efficiency. every attempt should be made to optimize the layout in order to minimize para - sitic pcb effects (stray resistance, capacitance, and inductance) and emi coupling from the high frequency lx node. a suggested pcb layout for the aat2400 boost converter is shown in figures 4 and 7. the following pcb layout guidelines should be considered: 1. minimize the distance from capacitor c1 and c2s negative terminals to the pgnd pins. this is espe - cially true with output capacitor c2, which conducts high di/dt current from the output diode back to the pgnd pins. 2. minimize the distance between l1 to d1 and switch - ing pin sw; minimize the size of the pcb area con - nected to the sw pin. 3. maintain a ground plane and connect to the ic pgnd pin(s) as well as the pgnd connections of cin and cout. 4. consider additional pcb metal area on d1s cathode to maximize heat sinking capability. this may be necessary when using a diode with a high v f and/or thermal resistance. 5. consider additional pcb exposed area for the aat2400 to maximize heat sinking capability. this may be necessary when using high output voltage and high current with minimum input voltage appli - cation. connect the exposed paddle (bottom of the die) to pgnd or gnd. connect agnd, dgnd to sgnd as close as possible to the package and maxi - mize the heat sinking space for overall. 6. to maximize package thermal dissipation and power handling capacity of the aat2400 and aat2401 tqfn55-36 package, solder the exposed paddle of the ic onto the thermal landing of the pcb, where the thermal landing is connected to the ground plane. if heat is still an issue, multi-layer boards with dedicated ground planes are recommended. also, adding more thermal vias on the thermal land - ing would help transfer heat to the pcb effectively. downloaded from: http:///
25 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 manufacturer part number capacitance (f) voltage rating (v) temp co. case size murata grm185r60j225ke26 2.2 6.3 x5r 0603 murata grm188r71a225ke15 2.2 10 x7r 0603 taiyo yuden jmk107bj225kk-t 2.2 6.3 x7r 0603 taiyo yuden lmk107bj225ka-t 2.2 10 x7r 0603 murata grm31cr61h225ka88l 2.2 50 x5r 1206 tdk c3225x7r2a225k 2.2 100 x5r 1210 murata grm31cr71h475ka12l 4.7 50 x5r 1206 panasonic eev-ha1h2r2r 2.2uf 50v elect smd 4x4x5.4 sanyo 50ce4r7be 2.2uf 50v elect smd 4x4x5.4 table 24: typical suggested surface mount capacitors. 60v/3a d1 l1 10h vin c1 4.7f 50v vout c2 2.2f c32.2f 24v r3 12.1k c6 10f c50.68f c4 18nf r2 2k r16.04k r4442k r512.1k lx c8 4.7f 50v c9 2.2f c102.2f vin r8 12.1k c12 10f c110.68f r6 2k r9 2k vcc vcc1 r7 6.04k lx vcc vcc1 gnd gnd gnd gnd gnd gnd gnd gnd 1 2 3 jp4csfb vcc gnd 1 2 3 4 jp7 addr0 1 2 3 4 jp8 addr1 addr0 addr1 addr0addr1 addr0 addr1 vcc gnd sdi vcc gnd sdi 1 2 3 4 5 jp5sp1 gnd sdo sclk sdi csb 1 2 3 jp1 enable gnd lx 1 2 jp2sync vin 1 2 jp3 gsclk 1 2 3 4 5 6 7 8 9 10 header1 header 5x2 en en d2red led d3red led cs1cs3 cs5 cs7 out cs4cs6 cs8 out out cs2 1 2 3 4 5 6 7 8 9 10 header2 header 5x2 cs9cs11 cs13 cs15 out cs12cs14 cs16 out cs10 vin csbsdi sclk csbsdi sclk gsclkvsync gsclkvsync sd0 sdo c74.7f 50v r1010k 1 2 3 4 5 jp6sp1 gnd sdo sclk sdi csb vsync cs3 7 cs4 6 cs8 4 sgnd 5 cs2 8 rset 10 en 11 fault 12 pll 13 vin 16 vccio 18 sdo 19 comp 20 csfb 21 lx 24 lx 25 cs7 3 cs5 1 cs6 2 cs1 9 agnd 14 dgnd 15 vcc 17 pgnd 27 sync 22 nc 23 pgnd 26 addr1 28 addr0 29 vsync 30 gsclk 31 sdi 34 ovp 36 agnd 32 sclk 33 csb 35 u1tqfn55-36 aat2400 1 2 jp9csfbi vcc1 cs11 7 cs12 6 cs16 4 sgnd 5 cs10 8 rset 10 en 11 fault 12 pll 13 vin 16 vccio 18 sdo 19 gnd 20 csfbo 21 gnd 24 gnd 25 cs15 3 cs13 1 cs14 2 cs9 9 agnd 14 dgnd 15 vcc 17 gnd 27 gnd 22 csfbi 23 gnd 26 addr1 28 addr0 29 vsync 30 gsclk 31 sdi 34 ovp 36 agnd 32 sclk 33 csb 35 u2tqfn55-36 aat2401 gnd gnd gnd figure 3: aat2400 and aat2401 db1 evaluation board schematic. downloaded from: http:///
26 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 figure 4: aat2400 and aat2401 evaluation board top side layout. figure 5: aat2400 and aat2401 evaluation board middle-1 layer layout. downloaded from: http:///
27 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 figure 6: aat2400 and aat2401 evaluation board middle-2 layer layout. figure 7: aat2400 and aat2401 evaluation board bottom side layout. downloaded from: http:///
28 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 evaluation board component lists component part number description manufacturer u1 aat2400iih 8 channel white led driver with current and timing control (master); 36 pin, 5x5 tqfn package skyworks r1 chip resistor 6.04k?, 1%, 1/4w; 0603 vishay r2 chip resistor 2k?, 1%, 1/4w; 0603 vishay r3, r5 chip resistor 12.1k?, 1%, 1/4w; 0603 vishay r4 chip resistor 442k?, 1%, 1/4w; 0603 vishay r6 chip resistor 2k?, 5%, 1/4w; 0603 vishay c1 grm31cr71h475k 4.7f, 10%, 50v, x7r, 1206, 1.6mm murata c2, c3 grm185r60j225ke26 2.2f, 10%, 6.3v, x5r, 0603, 0.5mm murata c4 grm155r71h183ka12d 18nf, 10%, 50v, x7r, 0402, 0.5mm murata c5 grm188r71a684ka61d 0.68f, 10%, 10v, x7r, 0603, 0.8mm murata c6 grm188r60j106m 10f, 10%, 6.3v, x5r, 0603, 0.8mm murata c7 50ce4r7be 4.7f 50v aluminum electrolytic capacitor sanyo l1 rlf12545t-100m5r1-pf shield drum core, 10h, 6a, 12.4m? tdk d1 mbrd360g 3.0a, 60v, sma schottky barrier rectiier on-semi d2 ltst-c190ckt red led; 0603 lite-on inc. jtag1 hrp10h-nd low proile 5x2 con. header, 2.54mm assmann jp1 - jp7 prpn401paen conn. header, 2.54mm zip sullins electronics table 23: aat2400 evaluation board component listing. component part number description manufacturer u2 aat2401iih 8 channel white led driver with current and timing control (slave); 36 pin, 5x5 tqfn package skyworks r7 chip resistor 6.04k?, 1%, 1/4w; 0603 vishay r8 chip resistor 12k?, 1%, 1/4w; 0603 vishay r9 chip resistor 2k?, 5%, 1/4w; 0603 vishay r10 chip resistor 10k?, 5%, 1/4w; 0603 vishay c8 grm31cr71h475k 4.7f, 10%, 50v, x7r, 1206, 1.6mm murata c9, c10 grm185r60j225ke26 2.2f, 10%, 6.3v, x5r, 0603, 0.5mm murata c11 grm188r71a684ka61d 0.68uf, 10%, 10v, x7r, 0603, 0.8mm murata c12 grm188r60j106m 10f, 10%, 6.3v, x5r, 0603, 0.8mm murata d3 ltst-c190ckt red led; 0603 lite-on inc. jtag2 hrp10h-nd low proile 5x2 conn. header, 2.54mm assmann table 24: aat2401 evaluation board component listing. component part# description manufacturer led ssc-zwt715 60ma lcd backlighting led seoul semiconductor cable h3ccs--1006g-nd double ended socket cable assmann table 25: component listing for led board. downloaded from: http:///
29 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 register summary table name addr default d7 d6 d5 d4 d3 d2 d1 d0 dot1 00h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot2 02h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot3 04h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot4 06h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot5 08h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot6 0ah 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot7 0ch 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot8 0eh 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot9 10h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot10 12h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot11 14h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot12 16h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot13 18h 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot14 1ah 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot15 1ch 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dot16 1eh 7fh bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs1 lsb 40h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs1 msb 42h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs2 lsb 44h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs2 msb 46h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs3 lsb 48h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs3 msb 4ah 04h x x x x bit 11 bit 10 bit 9 bit 8 gs4 lsb 4ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs4 msb 4eh 04h x x x x bit 11 bit 10 bit 9 bit 8 gs5 lsb 50h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs5 msb 52h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs6 lsb 54h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs6 msb 56h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs7 lsb 58h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs7 msb 5ah 04h x x x x bit 11 bit 10 bit 9 bit 8 gs8 lsb 5ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs8 msb 5eh 04h x x x x bit 11 bit 10 bit 9 bit 8 gs9 lsb 60h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs9 msb 62h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs10 lsb 64h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs10 msb 66h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs11 lsb 68h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs11 msb 6ah 04h x x x x bit 11 bit 10 bit 9 bit 8 gs12 lsb 6ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs12 msb 6eh 04h x x x x bit 11 bit 10 bit 9 bit 8 gs13 lsb 70h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs13 msb 72h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs14 lsb 74h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs14 msb 76h 04h x x x x bit 11 bit 10 bit 9 bit 8 gs15 lsb 78h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs15 msb 7ah 04h x x x x bit 11 bit 10 bit 9 bit 8 gs16 lsb 7ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 gs16 msb 7eh 04h x x x x bit 11 bit 10 bit 9 bit 8 downloaded from: http:///
30 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 register summary table (continued) name addr default d7 d6 d5 d4 d3 d2 d1 d0 dly1 lsb 80h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly1 msb 82h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly2 lsb 84h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly2 msb 86h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly3 lsb 88h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly3 msb 8ah 00h x x x x bit 11 bit 10 bit 9 bit 8 dly4 lsb 8ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly4 msb 8eh 00h x x x x bit 11 bit 10 bit 9 bit 8 dly5 lsb 90h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly5 msb 92h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly6 lsb 94h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly6 msb 96h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly7 lsb 98h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly7 msb 9ah 00h x x x x bit 11 bit 10 bit 9 bit 8 dly8 lsb 9ch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly8 msb 9eh 00h x x x x bit 11 bit 10 bit 9 bit 8 dly9 lsb a0h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly9 msb a2h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly10 lsb a4h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly10 msb a6h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly11 lsb a8h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly11 msb aah 00h x x x x bit 11 bit 10 bit 9 bit 8 dly12 lsb ach 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly12 msb aeh 00h x x x x bit 11 bit 10 bit 9 bit 8 dly13 lsb b0h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly13 msb b2h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly14 lsb b4h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly14 msb b6h 00h x x x x bit 11 bit 10 bit 9 bit 8 dly15 lsb b8h 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly15 msb bah 00h x x x x bit 11 bit 10 bit 9 bit 8 dly16 lsb bch 00h bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 dly16 msb beh 00h x x x x bit 11 bit 10 bit 9 bit 8 ctl1 c0h 00h cs8 on cs7 on cs6 on cs5 on cs4 on cs3 on cs2 on cs1 on ctl2 c2h 00h cs16 on cs15 on cs14 on cs13 on cs12 on cs11 on cs10 on cs9 on fault1 e0h 00h cs4 cs4 cs3 cs3 cs2 cs2 cs1 cs1 fault2 e2h 00h cs8 cs8 cs7 cs7 cs6 cs6 cs5 cs5 fault3 e4h 00h cs12 cs12 cs11 cs11 cs10 cs10 cs9 cs9 fault4 e6h 00h cs16 cs16 cs15 cs15 cs14 cs14 cs13 cs13 otmp1 e8h 00h x x x x x conig bit 1 bit 0 otmp2 eah 00h x x x x x conig bit 1 bit 0 fault reporting 1 f0h aah cs4 cs4 cs3 cs3 cs2 cs2 cs1 cs1 fault reporting 2 f2h aah cs8 cs8 cs7 cs7 cs6 cs6 cs5 cs5 fault reporting 3 f4h aah cs12 cs12 cs11 cs11 cs10 cs10 cs9 cs9 fault reporting 4 f6h aah cs16 cs16 cs15 cs15 cs14 cs14 cs13 cs13 test modes feh 00h tm7 tm6 tm5 tm4 tm3 tm2 tm1 tm0 downloaded from: http:///
31 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn, and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. ordering information package marking 1 part number (tape and reel) 2 tqfn55-36 7wxyy aat2400iih-t1 tqfn55-36 7xxyy AAT2401IIH-T1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?nition of green? , document number sq04-0074. package information tqfn55-36 3 0.750 0.050 0.000 + 0.050 - 0.000 0.203 ref 0.200 0.050 0.450 0.050 0.40 bsc 5.000 0.050 5.000 0.050 3.600 0.050 detail "a" 3.600 0.050 to p view sie view detail "a" botto view e aea d2 e2 r 0. c 0.3 all dimensions in millimeters. downloaded from: http:///
32 aa t2400/2401 da ta sheet sixteen-channel white led driver solution with full led current and timing control skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202307a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 24, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (skyworks) pr oducts or services. these materials, including the information contained herein, are provided by sky works as a service to its customers and may be used for informational purposes only by the customer. skyworks a ssumes no responsibility for errors or omissions in these materials or the information contained her ein. sky- works may change its documentation, products, services, speciications or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conlicts, incompatibilities, or other dificulties arising from any fut ure changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual prope rty rights by this document. skyworks assumes no liability for any materials, products or informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or ma terials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether e xpress, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual proper ty right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, i ncluding without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, o r other equipment in which the failure of the skyworks products could lead to personal injury, death , physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applicatio ns do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may dev iate from published speciications as a result of design defects, errors, or operation of products ou tside of pub- lished parameters or design speciications. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, custom er product design, or damage to any equipment resulting from the use of skyworks products outside of stated pub lished speciications or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identiication purposes only, and are the property of their respective owners. additional information , including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by refere nce. downloaded from: http:///

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