U643B-MY View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

U643B-MY

Flasher/ 30-mohm Shunt

Atmel Corporation 

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

2

Measuring comparator K 1

V 6-81 mV

20 kΩ

5 kΩ

K1

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

470 Ω

49 a

5 W 21 W 21 W

21 W 21 W 5 W

GND

- 31

Indicator lamps

2 U643B

4727B–AUTO–09/05

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