DESCRIPTION

· The U479B is a monolithic integrated bipolar circuit designed for monitoring lamp failure in automobiles.
· It features a comparator threshold matched to the PTC characteristic of incandescent lamps.
· The output is controlled based on the voltage drop across a shunt resistor, turning off if it exceeds 8 mV.
· The output is also turned off without supply voltage or if the input pin 8 is open.
· Unused comparator inputs must be connected to pin 7.

FEATURES

· 2-kV ESD Protection.
· Two comparators with a 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.

APPLICATIONS

· Automotive lamp-outage monitoring.
· Protection and monitoring in automotive electrical systems.