hv839 features ? independent input control for lamp selection ? split supply capability ? patented output timing ? one miniature inductor to power both lamps ? low shutdown current ? wide input voltage range 2.0 to 5.8v ? output voltage regulation ? no scr output ? available in small packages (10-lead msop and 10-lead dfn) applications ? mobile cellular phones, dual display ? keypad and lcd backlighting ? portable instrumentation ? dual segment lamps ? hand held wireless communication devices general description the supertex hv839 is a high voltage driver designed for driving two el lamps with a combined area of 3.5in 2 . the input supply voltage range is from 2.0 to 5.8v. the device is designed to reduce the amount of audible noise emitted by the lamp. this device uses a single inductor and minimum number of passive components to drive two el lamps. the nominal regulated output voltage of 90v is applied to the el lamps. the two el lamps can be turned on and off by the two logic input control pins, c1 and c2. the device is disabled when both c1 and c2 (pins 1 and 4) are at logic low. the hv839 has an internal oscillator, a switching mosfet, and two high voltage el lamp drivers. an external resistor connected between the rsw-osc pin and the voltage supply pin vdd sets the frequency for the switching mosfet. the el lamp driver frequency is set by dividing the mosfet switching frequency by 128. an external inductor is connected between the lx and the vdd pins. depending on the el lamp size, a 1.0 to 10.0nf, 100v capacitor is connected between cs and ground. the two el lamps are connected between el1 to com and el2 to com. the switching mosfet charges the external inductor and discharges it into the capacitor at cs. the voltage at cs increases. once the voltage at cs reaches a nominal value of 90v, the switching mosfet is turned off to conserve power. the outputs el1 to com and el2 to com are confgured as h bridges and switch in opposite states to achieve 180v across the el lamp. typical application circuit high voltage dual el lamp driver ic d c s + - + - 10 9 8 7 6 l x v en = on 0 = off v en = on 0 = off v dd c dd v in c in rsw-osc hv839 el lamp 2 1 el lamp 1 1 1. the bigger sized lamp should be tied to el1 and the smaller sized lamp to el2 terminals (pins 10 and 9 respectively) el1 el2 com cs lx c1 vdd rsw-osc c2 gnd 1 2 3 4 5 supertex inc. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
2 hv839 recommended operating conditions sym parameter min typ max units conditions v dd supply voltage 2.0 - 5.8 v --- t a operating temperature -40 - 85 c --- ordering information device package options 10-lead dfn 3.00x3.00mm body 1.0mm height (max) 0.50mm pitch 10-lead msop 3.00x3.00mm body 1.10mm height (max) 0.50mm pitch hv839 HV839K6-G hv839mg-g -g indicates package is rohs compliant (green) absolute maximum ratings parameter value v dd , supply voltage -0.5v to +7.5v v cs , output voltage -0.5v to +120v storage temperature -65c to +150c operating temperature -40c to +85c absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. all voltages are referenced to device ground. pin confgurations thermal resistance package ja 10-lead dfn 60 o c/w 10-lead msop 400 o c/w note: mounted on fr4 board, (25mm x 25mm x 1.57mm) product marking l = lot number yy = year sealed ww = week sealed = ?green? packaging h839 llll yyww top marking bottom marking h839 ywll y = last digit of year sealed w = code for week sealed l = lot number = ?green? packaging 10-lead dfn (k6) 10-lead msop (mg) 10-lead dfn (k6) 10-lead msop (mg) 8 2 3 4 7 6 5 10 1 c1 vdd rsw -osc c2 gnd 9 el1 el2 com cs lx 8 2 3 4 7 6 5 10 1 c1 vdd rsw -osc c2 gnd 9 el1 el2 com cs lx package may or may not include the following marks: si or package may or may not include the following marks: si or supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
3 hv839 dc electrical characteristics (over recommended operating conditions unless otherwise specifed. v dd = 2.6 to 5.5v, t a = 25c) sym parameter min typ max units conditions r ds(on) on resistance switching transformer - - 6.0 i = 100ma v dd input voltage range 2.0 - 5.8 v --- v cs output regulation voltage 80 90 100 v v dd = 2.0 to 5.8v v diff differential peak to peak voltage (el1 to com, el2 to com) 160 180 200 v v dd = 2.0 to 5.8v i ddq quiescent v dd supply current - - 150 na c1 = c2 = 0 to 0.1v - - 500 na c1 = c2 = 0.1 to 0.3v i dd input current to the vdd pin - - 190 a v dd = 2.0 to 5.8v i in input current including inductor current when driving both lamps - - 60 ma v in = 3.0v, see fig. 1 t a = -40 o c to +85 o c - 45 53 ma v in = 3.0v, see fig. 1 t a = +25 o c v cs output voltage on vcs when driving both lamps - 76.2 - v v in = 3.0v, see fig. 1 v diff differential output peak to peak voltage (el1 to com, el2 to com) - 152.4 - v v in = 3.0v, see fig. 1 f el v dif output drive frequency 440 500 560 khz v in = 3.0v, see fig. 1 f sw switching transistor frequency 56.3 64 71.7 khz v in = 3.0v, see fig. 1 f sw drift switching transistor frequency drift - - 5.0 khz t a = -40 o c to +85 o c d switching transistor duty cycle 85 - 89 % --- i il input logic low current going into the control pin - - -0.6 a v dd = 2.0 to 5.8v i ih input logic high current going into the control pin - - 0.6 a v dd = 2.0 to 5.8v v en-l logic input low voltage 0 - 0.3 v --- v en-h logic input high voltage 1.5 - v dd v --- supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
4 hv839 fig. 1: test circuit in914 1 220h 2 v en = on 0 = off v en = on 0 = off 220k el lamp 2 (0.9in 2 ) 3 0.1f 4.7f 3.3nf, 100v el lamp 1 (1.3 in 2 ) 3 1. or any (equivalent or better) > 90v, fast recovery diode 2. murata lqh32cn221k21 3. the bigger sized lamp should be tied to el1 and the smaller sized lamp to el2 terminals (pins 10 and 9 respectively) + - + - v dd v in hv839 10 9 8 7 6 el1 el2 com cs lx c1 vdd rsw-osc c2 gnd 1 2 3 4 5 device lamp v in = v dd i in v cs f el brightness hv839mg-g or HV839K6-G el1 3.0v 29.6ma 85.8 500hz 13.68ft-lm both el1 and el2 on 45.0ma 76.2 12.66ft-lm c1 c2 el1 el2 com ic 0 0 hi z hi z hi z off 0 1 hi z on on on 1 0 on hi z on on 1 1 on on on on function table v cs disable el1 el2 com rsw-osc cs lx vdd c1 c2 gnd logic control & divide by 128 control logic & switch-osc - + v sense v ref v cs output drivers functional block diagram supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
5 hv839 this section describes a method (patented) developed at supertex to reduce the audible noise emitted by the el lamps used in application sensitive to audible noise. the waveform takes the shape of approximately 2rc time con - stants for rising and 2rc time constants for falling, where c is the capacitance of the el lamp, and r is the external resistor, r ser connected in series with the el lamp. fig. 3 shows a general circuit schematic that uses the series resistors, r ser1 and r ser2 , for each of the el lamps. r ser1 and r ser2 are connected in series with the el lamp. the au - dible noise can be set a desirable level by selecting the re - sistances for r ser1 and r ser2 . it is important to note that addi - tion of these external resistors will reduce the voltage across the el lamp, and hence the brightness of the el lamp. audible noise reduction fig. 3: typical application circuit for audible noise reduction d c s + - + - on = v en off = 0 v dd c dd v in c in r sw-osc el lamp 2 1 el lamp 1 1 r ser2 r ser1 1. the bigger sized lamp should be tied to el1 and the smaller sized lamp to el2 terminals (pins 10 and 9 respectively) on = v en off = 0 enable 1 enable 2 hv839 10 9 8 7 6 el1 el2 com cs lx c1 vdd rsw-osc c2 gnd 1 2 3 4 5 l x split supply confguration fig. 2: split supply confguration d c s l x v en = on 0 = off v en = on 0 = off regulated voltage = v dd r sw-osc el lamp 2 1 el lamp 1 1 battery voltage = v in hv839 1. the bigger sized lamp should be tied to el1 and the smaller sized lamp to el2 terminals (pins 10 and 9 respectively) 10 9 8 7 6 el1 el2 com cs lx c1 vdd rsw-osc c2 gnd 1 2 3 4 5 the hv839 can be used in applications operating from a battery where a regulated voltage is available. this is shown in fig. 2. the regulated voltage can be used to drive the internal logic of hv839. the amount of current used to drive the internal logic is less than 190a. therefore, the regu - lated voltage could easily provide the current without being loaded down. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
6 hv839 typical performance curves (el1 lamp = 1.3in 2 , el2 lamp = 0.93in 2 , v dd = 3.0v) i in vs v in v cs vs v in brightness vs v in i in vs v cs brightness (ft-lm) i in (ma) i in (ma) 60 65 70 75 80 85 90 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v in (v) 30 35 40 45 50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v in (v) 30 35 40 45 50 60 65 70 75 80 85 90 v cs (v) 2 4 6 8 10 12 14 16 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v in (v) v cs (v) i in , v cs , brightness vs inductor v alue inductor v alue (mh) l in (ma), v cs (v) brightness (ft-lm) 20 30 40 50 60 70 80 90 100 200 300 400 500 600 4 6 8 10 12 14 16 18 v cs l in brightness (measured on el1 lamp) supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
7 hv839 pin description pin # name function 1 c1 enable input signal for el lamp 1. logic high will turn on the el lamp 1 and logic low will turn it off. refer to the function table. 2 vdd input supply voltage pin. 3 rsw-osc external resistor connection to set both the switching mosfet frequency and el lamp frequency. the external resistor should be connected between this pin and the vdd pin. the el lamp fre - quency is switching frequency divided by 128. the switching frequency increases as the value of r sw-osc decreases. a 220k resistor will provide a switching frequency of 64.0khz, and an el lamp frequency of 500hz. to change the frequency to f el1 , the value of the resistor r sw-osc1 can be determined as: r sw-osc1 = (220 x 500) / f el1 k. 4 c2 enable input signal for el lamp 2. logic high will turn on the el lamp 2 and logic low will turn it off. refer to the function table. 5 gnd ic ground pin. 6 lx external inductor connection to boost the low input voltage using inductive fyback. connect an inductor between vin and this pin. also connect a high voltage fast recovery diode between this pin and the cs pin. the anode of the diode needs to be connected to the lx pin and the cathode to the cs pin. in general, small valued inductors, which can handle more current, are more suitable for driving large sized lamps. as the inductor value decreases, the switching frequency should be increased to avoid saturation. when the switching mosfet is turned on, the inductor is being charged. when the mosfet is turned off, the energy stored in the inductor is transferred to the high voltage capacitor con - nected at the cs pin. 7 cs connect a 100v capacitor between this pin and gnd. this capacitor stores the energy transferred from the inductor. 8 com common connection for both el lamps. connect one end of both the lamps to this pin. 9 el2 el lamp 2 connection. for optimum performance, the smaller of the two lamps should be con - nected to this pin. 10 el1 el lamp 1 connection. for optimum performance, the larger of the two lamps should be connected to this pin. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
8 hv839 10-lead dfn package outline (k6) 3.00x3.00mm body, 1.00mm height (max), 0.50mm pitch symbol a a1 a3 b d d2 e e2 e l l1 dimension (mm) min 0.80 0.00 0.20 ref 0.18 2.85* 2.20 2.85* 1.40 0.50 bsc 0.30 0.00* 0 o nom 0.90 0.02 0.25 3.00 - 3.00 - 0.40 - - max 1.00 0.05 0.30 3.15* 2.70 3.15* 1.75 0.50 0.15 14 o jedec registration mo-229, variation veed-5, issue c, aug. 2003. * this dimension is not specifed in the jedec drawing. drawings not to scale. supertex doc. #: dspd-10dfnk63x3p050, version b041309. seating plane to p v iew side v iew bottom v iew a a1 d e d2 e b e2 a3 l l1 vi ew b vi ew b note 1 (index area d/2 x e/2) note 3 note 2 note 1 (index area d/2 x e/2) 10 1 10 1 notes: 1. a pin 1 identifer must be located in the index area indicated. the pin 1 identifer can be: a molded mark/identifer; an embedded metal marker; or a printed indicator. 2. depending on the method of manufacturing, a maximum of 0.15mm pullback (l1) may be present. 3. the inner tip of the lead may be either rounded or square. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
9 hv839 (the package drawing(s) in this data sheet may not refect the most current specifcations. for the latest package outline information go to http://www.supertex.com/packaging.html .) doc.# dsfp-hv839 b030910 10-lead msop package outline (mg) 3.00x3.00mm body, 1.10mm height (max), 0.50mm pitch symbol a a1 a2 b d e e1 e l l1 l2 1 dimen - sion (mm) min 0.75* 0.00 0.75 0.17 2.80* 4.65* 2.80* 0.50 bsc 0.40 0.95 ref 0.25 bsc 0 o 5 o nom - - 0.85 - 3.00 4.90 3.00 0.60 - - max 1.10 0.15 0.95 0.33 3.20* 5.15* 3.20* 0.80 8 o 15 o jedec registration mo-187, variation ba, issue e, dec. 2004. * this dimension is not specifed in the jedec drawing. drawings are not to scale. supertex doc. #: dspd-10msopmg, version f041309 1 10 seating plane gauge plane l l1 l2 e e1 e b a a2 a1 seating plane a a to p v iew side v iew vi ew a-a vi ew b vi ew b 1 (x4) d note 1 (index area d/2 x e1/2) note: 1. a pin 1 identifer must be located in the index area indicated. the pin 1 identifer can be: a molded mark/identifer; an embedded metal marker; or a printed indicator. supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such appl ications unless it receives an adequate ?product liability indemnification insurance agreement.? supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. no responsibility is assumed for possible omissions and inaccuracies. circuitry and specifications are subject to change without notice. for the latest product specifications refer to the supertex inc. (website: http//www .supertex.com) ?201 1 supertex inc. a ll rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www .supertex.com
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