1 general description: general description: general description: general description: general description: the durel ? d372a 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 d372a d372a d372a d372a d372a 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 typical waveform typical waveform typical waveform typical waveform typical waveform (el (el (el (el (el 1 1 1 1 1 - el - el - el - el - el 2 2 2 2 2 ) ) ) ) ) * 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+=3.3v, c s =22nf, clf=2.0nf, chf=68pf, l=2.2mh/4 ? , e=v+, r d =820 ? , 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 h z clf=2.0nf 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 21 29 standby current 5 1000 enable current 15 enable voltage on e 2.6 off 0.4 inductor frequency hf 21 lamp frequency lf 180 260 340 output voltage vout 140 170 100 ? 10 nf
2 parameter parameter parameter parameter parameter 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 peak 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 (pin3) voltage v chf gnd (v+) v clf (pin2) voltage v clf gnd (v+) v note: the absolute maximum ratings are stress ratings only. functional operation of the device at these ratings or any other conditions 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. el lamp ev+ l+ gnd el1 high frequency oscillator clf low frequency oscillator chf r d v bat l o g i c l o g i c divide by 2 el2 c s notes: notes: notes: notes: notes: 1. dimensions are in microns, unless otherwise noted. 2. bond pads are typically 100 x 100. 3. pad center coordinates are relative to origin on center of die. 4. 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: system power input capacitor input to low frequency oscillator capacitor input to high frequency oscillator system enable power ground inductor connection high voltage storage capacitor el lamp connection el lamp connection wave shaping resistor absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: absolute maximum ratings: pad center locations msop pad center locations msop pad center locations msop pad center locations msop pad center locations msop function function function function function name xm ym pin-outs name xm ym pin-outs name xm ym pin-outs name xm ym pin-outs name xm ym pin-outs physical data: physical data: physical data: physical data: physical data: v+ 1 clf 2 chf 3 e4 gnd 5 l+ 6 cs 7 el 1 8 el 2 9 r d 10 chf gnd cs l+ rd clf v+ 0 0 e el2 el1 contact factory for pad locations
typical d372a el driver configuration: 3.0v cellular lcd typical output brightness = 6.9 fl (23.6 cd/m 2 ) lamp frequency = 280 hz supply current = 22ma vpp = 210 load = 1.0in 2 5.0 v pda typical output brightness = 6.9fl (23.6 cd/m 2 ) lamp frequency = 280 hz supply current = 17ma vpp = 210 load = 4in 2 3.3 v cellular display and keypad typical output brightness = 6.0 fl (20.5 cd/m 2 ) lamp frequency = 280 hz supply current = 19ma vpp = 210 load = 1.5in 2
4 figure 2: typical lamp frequency vs. clf capacitor designing with d372 designing with d372 designing with d372 designing with d372 designing with d372 the durel ? d372 chip inverter is part of a family of switch-mode ic drivers intended to reduce el system cost, improve el system performance, and simplify design. this powerful ic and a few components make a complete lamp driving circuit ideal for cellular phones, pagers, personal digital assistants (pdas), and other applications using liquid crystal displays (lcds). a typical d372 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. 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 d372 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 01 234 cl f ( n f) lamp frequency (hz) 1 2 3 4 5 6 7 8 9 10 el lamp chf clf vbat 0.1 uf l vbat v+ clf chf e gnd l+ cs el1 el2 rd d372a vbat cs rd
5 the lamp frequency may also be controlled with an external clock signal. the resulting lamp frequency will be half of the clock signal frequency. the differential output voltage will increase in magnitude during the high portion of the clock signal and decrease during the low portion of the clock signal. lamp frequencies of 200-500hz are typically used. 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 inductor switching frequency of the d372 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 chf ( p f) inductor frequency (khz) figure 3: typical inductor frequency 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 brightness and current consumption of the driver. figures 4 and 5 show typical brightness and current draw of a d372 circuit with several different inductor and chf values. the clf value was modified in each case such that the output voltage was approximately 200vpp. 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 manufacturers 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 0.47 0.56 0.68 0.82 1 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.7 in d u c to r (m h ) 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 0.00 1.00 2.00 3.00 4.00 5.00 6.00 0.47 0.56 0.68 0.82 1.00 1.20 1.50 1.80 2.20 2.70 3.30 3.90 4.70 inductor (mh) brightness (ft-l) 0.0 20.0 40.0 60.0 80.0 100.0 120.0 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=1.5in 2 figure 5: brightness and current vs. inductor and chf value. conditions: v+=5.0v, lamp=4.0in 2
7 iv. wave-shaping iv. wave-shaping iv. wave-shaping iv. wave-shaping iv. wave-shaping the r d resistor determines the slope of the charge and discharge portions of the output waveform. the optimal value of this resistor depends on the lamp size and drive conditions. larger el lamps typically require smaller values of r d . in general, smaller values of r d result in higher initial lumi- nance from the el lamp. larger values of r d can reduce audible noise from the el lamp and increase lamp life. typical values range from 200 ? - 2.0k ? . recommended starting values for various lamp sizes are shown in the table, below. r r r r r d d d d d lamp size lamp size lamp size lamp size lamp size 1.2k ? <1.0 in 2 820 ? 1.0 ? 2.0 in 2 470 ? 2.0 ? 4.0 in 2 220 ? >4.0 in 2
the d372a 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 d372a designer ? s kit is available for evaluating and identifying the optimum component values for your application. msops in tubes: 1DDD372AA-M03 msops in tubes: 1DDD372AA-M03 msops in tubes: 1DDD372AA-M03 msops in tubes: 1DDD372AA-M03 msops in tubes: 1DDD372AA-M03 msops in tape & reel: 1ddd372aa-m04 msops in tape & reel: 1ddd372aa-m04 msops in tape & reel: 1ddd372aa-m04 msops in tape & reel: 1ddd372aa-m04 msops in tape & reel: 1ddd372aa-m04 msops are marked with direct logo part number (372a) 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. f h j a b g c d e 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 9032 rev. a02 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 pending u.s. patent applications. 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: 1ddd372aa-b02 die in trays: 1ddd372aa-b02 die in trays: 1ddd372aa-b02 die in trays: 1ddd372aa-b02 die in trays: 1ddd372aa-b02
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