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U2043B Datasheet

Pilot Lamp to GND or VBatt

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U2043B pdf
Features
Temperature and Voltage Compensated Frequency
Warning Indication of Lamp Failure by Means of Frequency Doubling
Minimum Lamp Load for Flasher Operation 10W
Relay Output with High Current Carrying Capacity and Low Saturation
Voltage
Low Susceptibility to EMI
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1. Description
The integrated circuit U2043B is used in relay-controlled automotive flashers where a
high EMC level is required. A lamp outage is indicated by frequency doubling during
hazard mode as well as direction mode. The pilot lamp can be connected either to
VBatt or GND.
Figure 1-1. Block Diagram
C1
4
6
Measuring comparator
K 1 V 6-81 mV
2
7
R3 30 m
Shunt
+VS
+ 49
Pilot lamp 5 W
Pulse
R1 generator
3.8 k
K 3 V 6-5 V
5
49 a-Comparator
23 V
IC Ground
3
Relay
8 R2
3.3 k
1 R1
100
GND
- 31
49 a
5 W 21 W 21 W
21 W 21 W 5 W
Indicator lamps
Pilot lamps
Flasher, 30 m
Shunt, Pilot
Lamp to GND or
VBatt
U2043B
Rev. 4720B–AUTO–09/05
ATMEL Corporation
ATMEL Corporation



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