U643B Datasheet - ATMEL Corporation

U643B Flasher IC

The bipolar integrated circuit U643B is used in relay-controlled automotive flashers where a high-level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode. U643B Rev. 4727B *AUTO *09/05 2. Block Diagram Figure 2-1. Car Fl.

U643B Features

* Temperature and Supply Voltage Compensated Flashing Frequency

* Frequency Doubling Indicates Lamp Outage

* Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage

* Minimum Lamp Load for Flasher Operation: ≥ 1W

* Very Low Susceptib

U643B_ATMELCorporation.pdf