Description
The bipolar integrated circuit, U644B, is used in relaycontrolled automotive flashers where a high level EMC is required.
Features
- D Frequency doubling indicates lamp outage D Frequency independent of temperature and voltage
change
D Minimum lamp load for flasher operation: D Very low susceptibility to EMI
1 W
D Relay driver output with high current-carrying
capacity and low saturation voltage
D Protection according to ISO TR7637/1 level 4 D Control input (Kl 15)
Ordering Information
Extended Type Number U644B U644B-FP Package DIP8 SO8 Remarks
Block Diagram
R5 10 kW 30 2 Measuring comparator K 1 V S.
- 49 mV 4.
U644B Datasheet
