rev. 4775a?auto?11/03 features 2-kv esd protection two comparators with common reference tight threshold tolerance threshold matched to ptc characteristic of incandescent lamps temperature compensated npn output interference and damage-protection according to vde 0839 emi protection reversal polarity protection load-dump protection description the monolithic integrated bipolar circuit, U479B, is designed as a monitor for lamp fail- ure in automobiles. the comparator threshold is matched to the ptc characteristic of incandescent lamps. the threshold is tied to v 4,6 = v s - v t where v t = 8 mv. if the voltage drop across the shunt resistor, r sh , exceeds 8 mv, the output is turned off, otherwise, the output is turned on. without supply voltage or open input pin 8, the output is turned off. a comparator input, which is not used, must be connected to pin 7. figure 1. schematic and application circuit - + - + - + & & 2 7 4 8 6 5 3 1 150 ? v s lamps 0.6 v s out1 out2 v batt z 2 r sh r sh r 1 automotive lamp-outage monitor ic U479B
2 U479B 4775a?auto?11/03 pin configuration figure 2. pinning dip8/so8 1 2 3 4 5 6 7 8 gnd vs out2 1n1 out1 in2 vref input pin description pin symbol function 1 gnd reference point, ground 2 vs supply voltage 3 out2 output 2 4 in1 input 1 5 out1 output 1 6 in2 input 2 7 vref reference voltage 8 input input switch
3 U479B 4775a?auto?11/03 absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . parameters pin symbol value unit supply voltage 2, 7 v s 16.5 v current consumption, t = 2 ms 1 i 1 1.5 a output current 3, 5 i 3,5 20 ma input voltage reference point pin 7 4, 6 -v 4,6 6v power dissipation t amb = 95 cdip8 so8 p tot p tot 420 360 mw mw t amb = 60 cdip8 so8 p tot p tot 690 560 mw mw ambient temperature range t amb -40 to +95 c storage temperature range t stg -55 to +125 c junction temperature t j 150 c thermal resistance parameters symbol value unit junction ambient dip8 r thja 110 k/w so8 r thja 160 k/w
4 U479B 4775a?auto?11/03 figure 3. delay times electrical characteristics v s = 9 to 15 v, t amb = -40 to +95 c, figure 1 on page 1, unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit supply voltage 2, 7 v s 915v internal z-diode z 2 2v z 20 v current consumption v s = 12 v 1 i 1 4.5 6 ma output saturation voltage v s = 9 v, i 3,5 = 10 ma t amb = 25 c 3, 5 v sat 0.5 v control signal threshold reference point v pin 7 i 3,5 = 3 ma v s = 12 v v s = 15 v 4, 6 -v t -v t 6.5 7.8 8 9.3 9.5 10.8 mv mv voltage drift v0.45mv/v threshold voltage switch identification 8 v 8 0.6 v s v input currents input 1/input 2 4, 6 i i 100 na input switch 8 i i 5a delay time switch-on, high to low 3, 5 t d(on) 6s switch-off, low to high t d(off) 30 s v v t(15 v) v t(12 v) ? 15 v 12 v ? --------------------------------------------- = 12.00 11.95 12 v 0 t d(on) 10 20 30 40 50 60 s 0 t v v 6 t d(off) v 4,6
5 U479B 4775a?auto?11/03 package information ordering information extended type number package remarks U479B dip8 ? U479B-fp so8 ? 9.8 9.5 package dip8 dimensions in mm 1.64 1.44 4.8 max 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 max 9.8 8.2 7.77 7.47 85 14 technical drawings according to din specifications
6 U479B 4775a?auto?11/03 technical drawings according to din specifications package so8 dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 85 14
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