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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:
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1W
Very Low Susceptibility to EMI
Protection According to ISO/TR 7637/1 Level 4
Flasher IC with
30-m鈩?Shunt
U643B
1. Description
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.
Rev. 4727B鈥揂UTO鈥?9/05
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