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U643B

ATMEL Corporation
Part Number U643B
Manufacturer ATMEL Corporation
Description Flasher IC
Published Apr 16, 2005
Detailed Description Features • Temperature and Supply Voltage Compensated Flashing Frequency • Frequency Doubling Indicates Lamp Outage • Re...
Datasheet PDF File U643B PDF File

U643B
U643B

Overview
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 Susceptibility to EMI • Protection According to ISO/TR 7637/1 Level 4 Flasher IC with 30-mΩ Shunt 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.
U643B Rev.
4727B–AUTO–09/05 2.
Block Diagram Figure 2-1.
Car Flasher Application Circuit, Resistor R1 and R2: 0.
25W; R4 for Protection Against Continuous Reversed Polarity: 0.
5W C1 4 6 Measuring comparator K 1 V 6-81 mV 20 kΩ K1 2 5 kΩ 7 R3 Shunt 30 mΩ + VS + 49 K2 Pulse R1 generator 49 a-Comparator K 2 20 kΩ 49 a-Comparator K 3 K3 5 20 kΩ 3 Relay 8 R2 23 V 5 kΩ IC Ground 1 1.
5.
.
.
2.
2 kΩ R4...


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