telefunken semiconductors u4791b/ U4791B-FP rev. a1: 31.07.1995 1 5) automotive lamp outage monitor, v t = 53 mv description the monolithic integrated bipolar circuit, u4791b, is de- signed as a monitor for lamp failure in automobiles. the comparator threshold is matched to the ptc characteristic of incandescent lamps. the threshold is tied to a typical value of v 4,6 = v s v t whereas v t = 53 mv. the integrated circuit is recommended for the application of parallel connected lamps. if the voltage drop across shunt resistor, r sh , exceeds 53 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 not used comparator must be connected to pin 7. features 10 kvesd protection two comparators with common reference tight threshold tolerance threshold matched to ptc characteristic of incandescent lamps temperature compensated npn output interference and damageprotection according to vde 0839 emi protection reversal polarity protection load dump protection case: dip 8 and so 8 block diagram + + + & & z 2 2 7 4 8 6 5 3 1 r 1 150 v s v batt r sh r sh lamps 95 10613 0.6 v s out out z 5 z 3 figure 1. schematic and application circuit
telefunken semiconductors u4791b/ U4791B-FP rev. a1: 31.07.1995 2 (5) pin description 1 2 3 4 5 6 7 8 gnd v s output 2 input 1 output 1 input 2 v ref input switch 95 10634 pin symbol function 1 gnd reference point, ground 2 v s supply voltage 3 o 2 output 2 4 i 1 input 1 5 o 1 output 1 6 i 2 input 2 7 v ref reference voltage 8 input input switch absolute maximum ratings parameters symbol value unit supply voltage pin 2, 7 v s 16.5 v current consumption t = 2 ms, measured at pin 1 (gnd) pin 1 i 1 1.5 a output current pin 3, 5 i 3,5 20 ma input voltage pin 4, 6 reference point pin 7 v 4,6 6 v power dissipation t amb = 95 c dip 8 so 8 p tot 420 360 mw t amb = 60 c dip 8 so 8 p tot 690 560 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
telefunken semiconductors u4791b/ U4791B-FP rev. a1: 31.07.1995 3 5) electrical characteristics v s = 9 to 15 v, t amb = 40 to +95 c, figure 1, unless otherwise specified parameters test conditions / pin symbol min typ max unit supply voltage pin 2,7 v s 9 15 v internal z diode z 2 pin 2 v z 20 v current consumption v s = 12 v pin 1 measured at pin 1 (gnd) i 1 4.5 6 ma output saturation voltage v s = 9 v, i 3,5 = 10 ma t amb = 25 c pin 3,5 v sat 0.5 v output z diodes z 3 , z 5 pin 3,5 v z 21 v control signal threshold reference point pin 7 (v 7 ) i 3,5 = 1 ma pin 4,6 v s = 12 v v s = 15 v v t 51.5 57 53.5 59 55.5 61 mv voltage drift v v t(15v) v t(12v) 15 v 12v pin 4,6 v 1.8 mv/v threshold voltage switch identification pin 8 v 8 0.6 v s v input currents pin 4,6 i i 100 na pin 8 5 a delay time switch-on pin 3,5 high to low t d(on) 6 s switch-off low to high t d(off) 30 s 12.00 11.90 12 v 4,6 v 0 t d(off) t d(on) 10 20 30 40 50 60 s 0 t 95 10614 v v 6 figure 2.
telefunken semiconductors u4791b/ U4791B-FP rev. a1: 31.07.1995 4 (5) dimensions in mm package: dip 8 94 8873 package: so 8 94 8862
telefunken semiconductors u4791b/ U4791B-FP rev. a1: 31.07.1995 5 5) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423
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