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U644B

Flasher, 18-m

W

Shunt, Extremly Low Current Consumption

Description

The bipolar integrated circuit, U644B, is used in relay-

controlled automotive flashers where a high level EMC

is required. Lamp outage is indicated by frequency doub-

ling during hazard warning as well as direction mode.

If the flasher module provides an 4-pin connector the

control pin of U644B (Pin 6) can be used to operate the

IC in an extremly low-current mode.

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

R

5

10 k

W

30

2

Measuring

comparator K

1

V

S

鈥?49 mV

4

K

1

6

15

C

1

R

4

Shunt

20 k

W

20 k

W

7

2 k

W

3

18 m

W

K

2

R

1

Pulse

generator

49 a

Comparator K

2

20 k

W

8

Relay

R

3

3.3 k

W

30 V

1

GND

R

2

220

W

GND

鈥?1

49 a

5

K

3

49 a

Comparator K

3

20 k

W

13 k

W

12707

Figure 1. Application circuit as a car flasher with control input

Resistor R

1

, R

2

and R

3

: 1/4 Watt

R

2

for protection against continuous reversed polarity: 1 Watt

TELEFUNKEN Semiconductors

Rev. A2, 25-Feb-97

1 (6)

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U644B-FP相關(guān)型號(hào)PDF文件下載

• 型號(hào)
  版本
  描述
  廠商
  下載
• U644B
  英文版
  Flasher, 18-m Shunt, Extremly Low Current Consumption
  TEMIC
  U644B
• U644B
  英文版
  Flasher, 18-m Shunt, Extremly Low Current Consumption
  TEMIC [TEM...
  U644B
• U644B-FP
  英文版
  Flasher, 18-m Shunt, Extremly Low Current Consumption
  TEMIC
  U644B-FP
• U644B-FP
  英文版
  Flasher, 18-m Shunt, Extremly Low Current Consumption
  TEMIC [TEM...
  U644B-FP

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