Description

The design of the U6433B is similar to that of U6043B, both devices have the same excellent EMC (Electro Magnetic Capability) and protection features. The U6433B includes an additional 8-mV comparator and a logical connection with the frequency doubling stage. This combination can be used for a hazard switch whichbypasses the external shunt resistor to disable the frequency doubling. This feature is especially important with respect to the US automotive industry. During direction mode the U6433B works like other flashers, i.e., frequency doubling in the case of lamp outage.

Features

Temperature and voltage compensated frequency

Warning indication of lamp failure by means of frequency doubling can be disabled

Voltage dependence of the car indicator lamps compensated for lamp failure

Relay output with high current carrying capacity and low saturation voltage

Minimum lamp load for flasher operation
≥ 1 W

Load-dump protection

Very low susceptibility to EMI

Protection according to ISO/TR 7637/1 level 4