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cost effective green pwm controller ap3105/v/l/r data sheet 1 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited general description the ap3105/v/l/r is a low startup current, current mode pwm controller with green-mode power-saving operation. the pwm switching frequency at normal operation is set with 65khz typically and the dithering of frequency will also improve the emi feature. when the load decreases, the frequency will reduce and when at a very low load, the ic will enter the burst mode to minimize switching loss. about 20khz frequency switching is to avoid the audi- ble noise as well as reducing the standby loss. the skip mode point can be adjusted through the external resis- tor connected to the cu rrent sense resistor. the ap3105/v/l/r features a lot of functions such as the leading-edge blanking (leb) of the current sens- ing, internal slope compensation and several protection functions including cycl e-by-cycle current limit (ocp), vcc over voltage protection (vovp), otp and olp protection. the versatile latch function can be set by the customer through few components. this ic is availabl e in sot-23-6 package. features very low start-up current current mode control non-audible-noise green-mode control skip mode adjustable internal slope compensation soft start during startup process frequency fold back for high average effi- ciency secondary short winding protection with focp soft switching for reducing emi vcc maintain mode latch function for otp/ovp useful pin fault protection: sense pin floating ctrl pin short to ground fb/opto-coupler open/short comprehensive system protection feature: vcc over voltage protection (vovp) over load protection (olp) mini size with packages pin to pin compatible with ap3103 applications switching ac-dc adapter/charger atx/btx auxiliary power set-top box(stb) power supply open frame switching power supply figure 1. package type of ap3105/v/l/r sot-23-6
cost effective green pwm controller ap3105/v/l/r data sheet 2 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited pin configuration pin number pin name function 1 gnd signal ground. current return for driver and control circuits 2 fb feedback. directly connected to the opto-coupler 3ctrl latch trigger if this pin voltage drops be low a threshold or over another threshold, leave ctrl pin open if this function is not needed. connecting a ntc thermistor to gnd can achieve otp protection 4 sense current sense 5 vcc supply voltage of driver and control circuits 6 gate gate driver output pin description (sot-23-6) gate gnd k package figure 2. pin configuration of ap3105/v/l/r (top view) 1 2 34 5 pin 1 mark 6 fb ctrl vcc sense
3 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited data sheet cost effective green pwm controller ap3105/v/l/r functional block diagram figure 3. functional blo ck diagram of ap3105/v/l/r gnd gate 250ns leb driver 13v q d clk rb dff osc with frequency jitter 0.85v vcc_ovp olp vcc 32v 28v vcc_ovp ovp uvlo uvlo 15.5v 8.6v internal bias 0.5v auto recovery protection ap3105 /v/l/r 100 u a line compensation fb r 2r burst pwm 1.1v soft start 0.5v ctrl_ h 1.8v latch-off protection ocp 32 ms delay olp focp focp 2.5v 3.6v 0.6v 10k ctrl_h ctrl_l ctrl_l 1 2 5 3 6 ctrl sense 4
cost effective green pwm controller ap3105/v/l/r data sheet 4 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited ordering information circuit type package k: sot-23-6 g1: green ap3105 - tr: tape and reel package part number marking id packing type sot-23-6 AP3105KTR-G1 ghn tape & reel ap3105vktr-g1 gho tape & reel ap3105lktr-g1 ghp tape & reel ap3105rktr-g1 ghq tape & reel bcd semiconductor's products, as designa ted with "g1" suffix in the part number, are rohs compliant and green. product version* blank: ap3105 v: ap3105v l: ap3105l r: ap3105r product version frequency vovp olp& socp ctrl (low) ctrl (high) ap3105 65khz auto-recoverable auto-re coverable latch auto-recoverable ap3105v 65khz latch auto-recoverable latch latch ap3105l 65khz latch latch latch latch ap3105r 65khz auto-recoverable auto-re coverable auto-recoverable latch * product version classification (with different protection functions)
5 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited data sheet cost effective green pwm controller ap3105/v/l/r parameter symbol value unit power supply voltage v cc 30 v gate output current i o 350 ma input voltage to fb, sense, ctrl v fb, v sense ,v ctrl -0.3 to 7 v thermal resistance (junction to ambient) ja 250 o c/w power dissipation at t a <25 o c p d 500 mw operating junction temperature t j -40 to150 o c storage temperature range t stg 150 o c esd (human body model) 3000 v esd (machine model) 300 v note 1: stresses greater than those listed under "a bsolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. exposure to "absolute max- imum ratings" for extended periods may affect device reliability. recommended operating conditions parameter symbol min max unit supply voltage v cc 10 25 v absolute maximum ratings (note 1)
cost effective green pwm controller ap3105/v/l/r data sheet 6 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited v cc =16v, t a =25 o c, unless otherwise specified. parameter symbol conditions min typ max unit supply voltage (vcc pin) startup current i startup 2525 a operating supply current i cc v fb =0v, c l =1nf 0.5 0.85 1.2 ma v fb =3v, c l =0nf 0.6 1.2 2.0 uvlo (on) 14.5 15.5 16.5 v vcc maintain 9.7 10.2 10.7 v uvlo (off) 7.6 8.6 9.6 v vcc ovp 27 28.5 30 v vcc clamp i cc =5ma 31 34 v pwm section/oscillator section maximum duty cycle 70 75 80 % oscillation frequency 60 65 70 khz green mode frequency 20 30 khz frequency temperature stability -20 o c to 125 o c (note 2) 5% frequency voltage stability v cc =12v to 30v 3% frequency dithering 4 6 8% current sense section (sense pin) maximum sense voltage v cs v fb =3.6v 0.800 0.850 0.900 v focp voltage 1.65 1.8 1.95 v leb time of sense 150 250 350 ns delay to output (note 2) 100 ns soft-start time 3 5 8 ms feedback input section (fb pin) the ratio of input voltage to current sense voltage 2.533.5v/v input impedance 7 10 13 k ? source current v fb =0v -0.75 -0.5 -0.25 ma green mode threshold 2 v input voltage for zero duty 1.3 1.55 1.8 v electrical characteristics
7 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited data sheet cost effective green pwm controller ap3105/v/l/r electrical characteristics v cc =16v, t a =25 o c, unless otherwise specified. parameter symbol conditions min typ max unit output section (gate pin) output low level i o =20ma, v cc =12v 1 v output high level i o =20ma, v cc =12v 8 v output clamping 11 13 15 v rising time (note 2) c l =1nf, v cc =13v 150 250 ns falling time (note 2) c l =1nf, v cc =13v 50 100 ns protection section (ctrl pin) source current 90 100 110 a internal refere nce voltage 1.5 v low threshold trigger for latch 0.47 0.5 0.53 v high threshold trigger for latch 2.35 2.5 2.65 v pull-up current (note 3) 2ma delay time section delay of short circui t protection 22 32 40 ms delay of hiccup protection vcc ovp 25 s note 2. guaranteed by design. note 3. the sourcing current of ctrl pin must be li mited below 5ma.otherwise it may cause permanent damage to the device.
cost effective green pwm controller ap3105/v/l/r data sheet 8 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited typical performance characteristics figure 4. startup voltage vs. ambient temperature figure 5. shutdown voltage vs. ambient temperature figure 6. startup current vs. ambient temperature figure 7. operating current vs. ambient temperature -40 -20 0 20 40 60 80 100 120 140 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 startup voltage (v) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 7.0 7.5 8.0 8.5 9.0 9.5 10.0 shutdown voltage (v) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 startup current ( a) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 operating current (ma) ambient temperature ( o c)
cost effective green pwm controller ap3105/v/l/r data sheet 9 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited ctrl utilization for latch ovp and otp ovp otp ctrl vcc ntc option ctrl vcc ntc option vcc ctrl ntc option
cost effective green pwm controller ap3105/v/l/r data sheet 10 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited operation description the ap3105/v/l/r is specifically designed for off-line ac-dc power supply used in lcd monitor, notebook adapter and battery charger ap plications. it offers a cost effective solution with a versatile protection function. start-up current and uvlo the start-up current of ap3105/v/l/r is optimized to realize ultra low current (5 a typical) so that vcc capacitor can be charged more quickly. the direct benefit of low start-up current is the availability of using large start-up resistor, which minimizes the resistor power loss for high voltage ac input. an uvlo comparator is included in ap3105/v/l/r to detect the voltage on vcc pin. it ensures that ap3105/ v/l/r can draw adequate energy from hold-up capacitor during power-on. the turn-on threshold is 15.5v and the turn-off threshold is 8.6v. current sense comparator and pwm latch the ap3105/v/l/r operates as a current mode controller, the output switch conduction is initiated by every oscillator cy cle and is terminated when the peak inductor current reaches the threshold level established by the fb pin. the inductor current signal is converted to a voltage signal by inserting a reference sense resistor r s . the inductor current under normal operating conditions is controlled by the voltage at fb pin. the relation between peak inductor current (i pk ) and v fb is: moreover, focp with 1.8v threshold is only about 100ns delay, which can avoid some catastrophic damages such as secondary rectifier short test. few drive cycles can alleviate th e destruction range and get better protection. leading edge blanking a narrow spike on the lead ing edge of the current waveform can usually be observed when the power mosfet is turned on. a 250ns leading-edge blank is built-in to prevent the false-triggering caused by the turn-on spike. during this period, the current limit comparator is disabled and the gate driver can not be switched off. at the time of turning on the mosfet, a negative undershoot (maybe larger than -0.3v) can occur on the sense pin. so it is strongly recommended to add a small rc filter or at least connect a resistor r on this pin to protect the ic (shown as figure 8). figure 8 built-in slope compensation it is well known that a continuous current mode smps may become unstable when the duty cycle exceeds 50%. the built-in slope co mpensation can improve the stability, so there is no n eed for design engineer to spend much time on that. fb pin and short circuit protection this pin is normally connected to the opto-coupler and always paralleled wi th a capacitor for loop compensation. when the voltage at this pin is greater than 4.2v and lasts for about 32ms, the ic will enter the protection mode. for ap3105/v/r, the system will enter hiccup mode to wait the v cc decreasing to low uvlo level, then the ic will try to restart until the failure removed. and when this voltage is less than 1.55v, the ic will stop the drive pulse immediately. therefore, this feature can be used for short circuit protection, which makes the system immune from damage. normally, output short makes the v fb value to the maximum because th e opto-coupler is cut off. v cc maintain mode during light load or step load , v fb will drop and be s fb pk r v i 3 / ) 8 . 0 ( ? = fb sense gate gnd ctrl 6 1 3 4 ap3105 vcc 5 2 large undershoot (more than -0.3v) may damage the sense pin r c necessary
cost effective green pwm controller ap3105/v/l/r data sheet 11 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited operation description (continued) lower than 1.55v, thus the pwm drive signal will be stopped, and there is no more new energy transfered due to no switching. therefore, the ic supply voltage may reduce to the shutdown threshold voltage and system may enter the une xpected restart mode. to avoid this, the ap3105/v/l/r hold a so-called v cc maintain mode which can supply energy to vcc. when v cc decreases to a set ting threshold, the v cc maintain comparator will output some drive signal to make the system switch and provide a proper energy to vcc pin. the v cc maintain function will cooperate the pwm and burst mode loop which can make the output voltage variation be within the regulation. this mode is very useful for reducing startup resistor loss and achieve a better standb y performance with a low value vcc capacitor. the v cc is not easy to touch the shutdown threshold during the startup process and step load. this will also simplify the system design. the normal vcc voltage is suggested to be designed a little higher than v cc maintain threshold thus can achieve the best balance between the standby and step load performance. system protection and pin fault protection the ap3105/v/l/r provides versatile system and pin fault protections. the ocp comparator realizes the cycle-by-cycle current limi ting (ocp). in universal input line voltage, the ic realizes the constant over load protection (olp). vcc over voltage protection can be applied as the pr imary ovp or opto-coupler broken protection. the ap3105/v/l/r also has pin fault connection protection including floating and short connection. the floating pin protection include the sense, fb, etc.. the short pin protection includes the ctrl pin short protection. when these pins are floated or ctrl pin is shorted to ground, pwm switching will be disabled, thus protecting the power system. latch protection function for some applications, the system requires the latch protection function. the ctrl pin has two kinds of modes to trigger the latch protection: high level trigger and low level trigger. the low threshold is 0.5v and high threshold voltage is 2.5v. some version will have only one mode. once the latch protection is triggered, the ic will disable the output signal, and the bulk capacitor provides the energy to ic through the startup resistor to ensure the ic disable the output (latch mode). this mode will be not released until the ac input is shut off. so, the de-latch time is mainly depending on the hv startup bulk capacitor value. therefore, if the system want a short de-latch time, it is better for the startup resistor take power from the point before the rectifier bridge as illustrated in below figure. vcc gnd fb ctrl ap3105v/l/r sense ac mains (90v to 265v) c bus gate 1 2 3 4 5 6
cost effective green pwm controller ap3105/v/l/r data sheet 12 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited figure 9. typical application of ap3105/v/l/r typical application ~ ~ + - vcc gnd gate fb sense ctrl ~ az431 ap3105/v/l/r l2 t1 r13 c7 c6 c8 r14 r15 r16 r17 r18 c9 u2 c10 r12 r11 r10 r9 r8 c5 r6 r19 c4 r5 r4 c2 c1 vr1 u1 ntc r2 r3 f1 r7 c3 c11 ntc r20
13 nov. 2012 rev. 1. 2 bcd semiconductor manufacturing limited data sheet cost effective green pwm controller ap3105/v/l/r mechanical dimensions sot-23-6 unit: mm(inch) 2.820(0.111) 3.020(0.119) 2.650(0.104) 2.950(0.116) 1.500(0.059) 1.700(0.067) 0.950(0.037)typ 1.800(0.071) 2.000(0.079) 0.300(0.012) 0.400(0.016) 0.700(0.028)ref 0.100(0.004) 0.200(0.008) 0 8 0.200(0.008) 0.300(0.012) 0.600(0.024) 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) 1.450(0.057) max 123 4 5 6 pin 1 mark
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office unit a room 1203, skyworth bldg., gaoxin ave.1.s., nanshan district, shenzhen, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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