Description
The bipolar integrated circuit U643B is used in relaycontrolled automotive flashers where a high-level EMC is required.
Features
- D Temperature and supply voltage compensated flashing frequency D Frequency doubling indicates lamp outage D Relay driver output with high current carrying capacity and low saturation voltage D Minimum lamp load for flasher operation: ≥ 1 W D Very low susceptibility to EMI D Protection according to ISO/TR 7637/1 level 4
Block Diagram
+ VS + 49 6 C1 4 Measuring comparator K 1 V6.
- 81 mV 20 kW K1 2 R3 Shunt 5 kW 7 30 mW
K2 R1 Pulse generator 3 49 a.
- Comparator K2 20 kW 49 a.
U643_ATMELCorporation.pdf
