U4790B

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


Pinout




Specifications

Parameters	Symbol	Value	Unit
Supply voltage Pin 2, 7	VS	16.5	V
Current consumption t = 2 ms, measured at Pin 1 (GND) Pin 1	I1	1.5	A
Output current Pin 3, 5	I3,5	20	mA
Input voltage Pin 4, 6 reference point Pin 7	V4,6	6	V
Power dissipation Tamb = 95 °C DIP 8 Tamb = 60 °C DIP 8	Ptot	420	mW
	Ptot	690	mW
Ambient temperature range	Tamb	40 to +95	°C
Storage temperature range	Tstg	55 to +125	°C
Junction temperature	Tj	150	°C

Description

The bipolar IC U4790B is designed 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 where V_T = 8 mV.

If the voltage drop across shunt resistor, R_sh, exceeds 8 mV, the output of U4790B is turned off, otherwise the output is turned on. Without supply voltage or open input Pin 8, the output is turned off. An unused comparator input must be connected to Pin 7.