1 general description: general description: general description: general description: general description: the durel ? d371a lamp driver is part of a family of switch-mode ic drivers intended to reduce el system cost, improve performance and to simplify the design, specification, and manufacture of el backlighting systems. this driver is optimized for cellular phone and databank backlighting applications. data sheet data sheet data sheet data sheet data sheet d371a d371a d371a d371a d371a electroluminescent electroluminescent electroluminescent electroluminescent electroluminescent lamp driver ic lamp driver ic lamp driver ic lamp driver ic lamp driver ic msop-10 msop-10 msop-10 msop-10 msop-10 t t t t t ypical ypical ypical ypical ypical w w w w w av av av av av efor efor efor efor efor m m m m m * load 2 flexible wave shaping capability cellular / phs phones high efficiency data banks small package size lcd backlighting adjustable output frequency high ac voltage output external clock compatible features features features features features a a a a a pplications pplications pplications pplications pplications (v+=3.0v, clf=3.9nf, chf=68pf, l=2.2mh/4 ? , e=v+, renable=0 ?, dch open, load 2*, t a =25 c, unless otherwise specified) lamp d lamp d lamp d lamp d lamp d r r r r r iv iv iv iv iv er s er s er s er s er s pecifications: pecifications: pecifications: pecifications: pecifications: ma na e = gnd a e = 3.0v v v khz chf=68pf hz clf=3.9nf vpp p p p p p arameter arameter arameter arameter arameter symbol symbol symbol symbol symbol minimum minimum minimum minimum minimum t t t t t ypical ypical ypical ypical ypical maximum maximum maximum maximum maximum unit unit unit unit unit conditions conditions conditions conditions conditions supply current i 15 18 standby current 5 1000 enable current 15 enable voltage on e 2.6 off 0.4 inductor frequency hf 23 lamp frequency lf 190 260 330 output voltage vout 160 188 215 100 ? 10 nf
2 notes: notes: notes: notes: notes: 1. dimensions are in microns, unless otherwise noted. 2. bond pads are typically 100 x 100. 3. die thickness is 330 +/- 25 (13 +/- 1 mil). 4. pad center coordinates are relative to origin on center of die. 5. die size is 1170 x 1760. 6. base of die should be grounded. b b b b b lock d lock d lock d lock d lock d iagram of the i iagram of the i iagram of the i iagram of the i iagram of the i nv nv nv nv nv er er er er er ter c ter c ter c ter c ter c ir ir ir ir ir cuitr cuitr cuitr cuitr cuitr y: y: y: y: y: absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: p p p p p arameter arameter arameter arameter arameter symbol symbol symbol symbol symbol minimum minimum minimum minimum minimum maximum maximum maximum maximum maximum unit unit unit unit unit comments comments comments comments comments supply voltage v operating range v+ 2.0 6.5 withstand range -0.5 9.0 output voltage vout 220 vpp p eak to peak voltage enable voltage e -0.5 (v+) +0.5 v operating temperature t a -40 85 c storage temperature t s -65 150 c solder temperature 245 300 c 5 second soak chf (pin 1) voltage v chf gnd (v+)+0.3v v clf (pin 2) voltage v clf gnd (v+)+0.3v v p p p p p ad c ad c ad c ad c ad c enter locations enter locations enter locations enter locations enter locations msop msop msop msop msop function function function function function n n n n n ame xm ame xm ame xm ame xm ame xm ym ym ym ym ym pin-outs pin-outs pin-outs pin-outs pin-outs p p p p p hysical d hysical d hysical d hysical d hysical d ata: ata: ata: ata: ata: chf -427 728 1 clf -427 463 2 e -426 -413 3 dch -445 -583 4 gnd -459 -776 5 n/c 6 l- 467 -345 7 v-out 473 -78 8 l+ 473 190 9 v+ 475 786 10 capacitor input to high frequency oscillator capacitor input to low frequency oscillator system enable wave shaping input power ground not connected negative power connection to inductor output voltage to el lamp positive power connection to inductor system power input e gnd vout l+ v+ clf chf 0 0 dch l- el lamp ev+ l+ l- gnd vout low frequency oscillator clf high frequency oscillator 1.0 f chf discharge logic constant current discharge r enable dch v bat note: the absolute maximum ratings are stress ratings only. functional operation of the device at these ratings or any other co nditions above those indicated in the specifications is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect life of lamp or driver.
3 t t t t t ypical d371a el d ypical d371a el d ypical d371a el d ypical d371a el d ypical d371a el d r r r r r iv iv iv iv iv er configuration: er configuration: er configuration: er configuration: er configuration: 3.0v cellular lcd 3.0v cellular lcd 3.0v cellular lcd 3.0v cellular lcd 3.0v cellular lcd t t t t t ypical o ypical o ypical o ypical o ypical o utput utput utput utput utput brightness = 6.75 fl (23.1 cd/m 2 ) lamp frequency = 460 hz supply current = 16ma vpp = 190 load = 1.5in 2 5.0 5.0 5.0 5.0 5.0 v pda v pda v pda v pda v pda t t t t t ypical o ypical o ypical o ypical o ypical o utput utput utput utput utput brightness = 5.5fl (18.8 cd/m 2 ) lamp frequency = 285 hz supply current = 15ma vpp = 200 load = 4in 2 3.3 3.3 3.3 3.3 3.3 v c v c v c v c v c ellular display and k ellular display and k ellular display and k ellular display and k ellular display and k e e e e e ypad ypad ypad ypad ypad t t t t t ypical o ypical o ypical o ypical o ypical o utput utput utput utput utput brightness = 4.45 fl (15.2 cd/m 2 ) lamp frequency = 275 hz supply current = 12ma vpp = 185 load = 2.25in 2
4 designing with d371 designing with d371 designing with d371 designing with d371 designing with d371 the durel ? d371a lamp driver is part of a family of switch-mode ic drivers intended to reduce el system cost, improve performance and to simplify the design, specification, and manufacture of el backlighting systems. this driver is optimized for cellular phone and databank backlighting applications. a typical d371 circuit is represented in figure 1. this application guideline is furnished to help you optimize your el driver circuit design. it provides typical system outputs, such as lamp luminance and supply current draw, for various circuit configurations. durel also provides a designer ? s kit, which includes a printed circuit board to aid you in developing an el lamp driver configuration that meets your requirements. f f f f f igur igur igur igur igur e 1: e 1: e 1: e 1: e 1: t t t t t ypical d371 c ypical d371 c ypical d371 c ypical d371 c ypical d371 c ir ir ir ir ir cuit d cuit d cuit d cuit d cuit d esign esign esign esign esign i. lamp frequency i. lamp frequency i. lamp frequency i. lamp frequency i. lamp frequency selecting the appropriate value of capacitor (clf) for the low frequency oscillator will set the output frequency of the d371 inverter. figure 2 graphically represents the effect of the clf capacitor value on the oscillator frequency at v+ = 3.0v. 100 200 300 400 500 600 700 800 900 012345678 910 cl f ( n f) lamp frequency (hz) f f f f f igur igur igur igur igur e 2: e 2: e 2: e 2: e 2: t t t t t ypical lamp fr ypical lamp fr ypical lamp fr ypical lamp fr ypical lamp fr equency vs. clf capacitor equency vs. clf capacitor equency vs. clf capacitor equency vs. clf capacitor equency vs. clf capacitor
5 the lamp frequency may also be controlled with an external clock signal. the resulting lamp fre- quency will be half of the clock signal frequency. the output voltage (pin 8) will increase in magni- tude during the low portion of the clock signal and linearly decrease during the high portion of the clock signal. lamp frequencies of 200-500hz are typically used. the lamp frequency should always be set so that the output voltage does not exceed 200vpp. ii. inductor switching frequency ii. inductor switching frequency ii. inductor switching frequency ii. inductor switching frequency ii. inductor switching frequency selecting the appropriate value of capacitor (chf) for the high frequency oscillator will set the induc- tor switching frequency of the d371 inverter. figure 2 graphically represents the effect of the chf capacitor value on the oscillator frequency at v+ = 3.0v. 10 15 20 25 50 75 100 125 150 175 200 225 chf ( p f) inductor frequency (khz) f f f f f igur igur igur igur igur e 3: e 3: e 3: e 3: e 3: t t t t t ypical inductor fr ypical inductor fr ypical inductor fr ypical inductor fr ypical inductor fr equency vs. chf capacitor equency vs. chf capacitor equency vs. chf capacitor equency vs. chf capacitor equency vs. chf capacitor the inductor switching frequency may also be controlled with an external clock signal. the inductor will charge during the low portion of the clock signal and discharge into the el lamp during the high portion of the clock signal. iii. inductor selection iii. inductor selection iii. inductor selection iii. inductor selection iii. inductor selection the inductor value and inductor switching frequency have the greatest impact on the output bright- ness and current consumption of the driver. figures 4 and 5 show typical brightness and current draw of a d371 circuit with several different inductor and chf values. the clf value was modi- fied in each case such that the output voltage was approximately 190vpp. please note that the dc resistance (dcr) and current rating of inductors with the same inductance value may vary with manufacturer and inductor type. thus, inductors made by a different manufacturer may yield different outputs, but the trend of the different curves should be similar.
6 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 0.39 0.47 0.56 0.68 0.82 1.00 1.20 1.50 1.80 2.20 2.70 3.30 3.90 inductor (mh) brightness (ft-l) 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 current (ma) 68 pf brightness 100 pf brightness 68 pf current 100 pf current figure 4: brightness and current vs. inductor and chf value. conditions: v+=3.0v, lamp=2.0in 2 figure 5: brightness and current vs. inductor and chf value. conditions: v+=5.0v, lamp=4.0in 2 0.00 2.00 4.00 6.00 8.00 10.00 12.00 0.39 0.47 0.56 0.68 0.82 1.00 1.20 1.50 1.80 2.20 2.70 3.30 3.90 inductor (mh) brightness (ft-l) 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 current (ma) 68 pf brightness 100 pf brightness 68 pf current 100 pf current
7 iv. wave-shaping iv. wave-shaping iv. wave-shaping iv. wave-shaping iv. wave-shaping the d371 inverter uses a patented wave-shaping technique for reducing audible noise from an el lamp. the linear discharge of the output waveform may be adjusted by selecting one of 4 lamp discharge levels. the optimal discharge level for an application depends on the lamp size, lamp brightness, etc. to ensure that the d371 is configured optimally, each level should be evaluated. in many cases, the lower discharge levels result in lower audible noise from the el lamp. discharge level discharge level discharge level discharge level discharge level renable renable renable renable renable dch pin dch pin dch pin dch pin dch pin t t t t t ypical lamp s ypical lamp s ypical lamp s ypical lamp s ypical lamp s iz iz iz iz iz e e e e e 1 (slowest) 80k ? open 0.5-1.5 in 2 20 ? open 1.0-2.5 in 2 3 80k ? gnd 1.5-3.5 in 2 4 (fastest) 0 ? gnd >3.5 in 2 v. output voltage v. output voltage v. output voltage v. output voltage v. output voltage the inductor and clf capacitor should be set such that the output voltage of the d371a inverter does not exceed 200vpp. in some cases, a pair of zener diodes connected to the output (as shown below) is recommended to prevent over-voltage on pin 8. durel can provide assistance in optimizing circuit components for your application.
the d371a inverter is available as bare die in probed wafer form or in die trays, and in a standard msop-10 plastic package per tube or per tape and reel. a durel d371a designer ? s kit is available for evaluating and identifying the optimum component values for your application. msops in tubes: 1DDD371AA-M03 msops in tubes: 1DDD371AA-M03 msops in tubes: 1DDD371AA-M03 msops in tubes: 1DDD371AA-M03 msops in tubes: 1DDD371AA-M03 msops in tape & reel: 1ddd371aa-m04 msops in tape & reel: 1ddd371aa-m04 msops in tape & reel: 1ddd371aa-m04 msops in tape & reel: 1ddd371aa-m04 msops in tape & reel: 1ddd371aa-m04 msops are marked with direct logo part number (371a) and wafer lot number. marking orientation is bottom closest to pin 1 side. ordering information: ordering information: ordering information: ordering information: ordering information: a 0.92 0.036 1.00 0.039 1.08 0.043 b 0.05 0.002 0.10 0.004 0.15 0.006 c 0.15 0.006 0.23 0.009 0.31 0.012 d 0.40 0.016 0.55 0.022 0.70 0.028 e 0.13 0.005 0.18 0.007 0.23 0.009 f 2.90 0.114 3.00 0.118 3.10 0.122 g 0.35 0.014 0.50 0.020 0.65 0.026 h 4.75 0.187 4.90 0.193 5.05 0.199 j 2.90 0.114 3.00 0.118 3.10 0.122 description mm. in. mm. in. mm. in. msop-10 msop-10 msop-10 msop-10 msop-10 min. t ypical max. tape orientation tube-length = 320 mm (12.6 in). 100 units per tube. embossed tape on 360 mm diameter reel per eia-481-2. 2500 units per reel. quantity marked on reel label. durel corporation 2225 w. chandler blvd. chandler, az 85224-6155 tel: (480) 917-6000 fax: (480) 917-6049 website: http://www.durel.com ? 2000, durel corporation printed in u.s.a. lit-i 9028 rev. a07 the durel name and logo are registered trademarks of durel corporation. this information is not intended to and does not create any warranties, express or implied, including any warranty of merchanta bility or fitness for a particular purpose. the relative merits of materials for a specific application should be determined by your e valuation. this inverter is covered by the following u.s. patents: #5,313,141, #5,789,870. corresponding foreign patents are issued and pe nding. iso 9001 certified ! ! ! ! ! die tray size is 2 inches square ! ! ! ! ! total number of pockets is 100 ! ! ! ! ! pocket depth is 890 m (0.035 ? ) ! ! ! ! ! pocket area is 2030 m x 2030 m (0.080 ? x 0.080 ? ) die in trays: 1ddd371aa-b02 die in trays: 1ddd371aa-b02 die in trays: 1ddd371aa-b02 die in trays: 1ddd371aa-b02 die in trays: 1ddd371aa-b02 f h i a b g c d e
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