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U644B-FP

Description
Flasher, 18-m Shunt, Extremly Low Current Consumption
File Size141KB,6 Pages
ManufacturerTEMIC
Websitehttp://www.temic.de/
Download Datasheet View All

U644B-FP Overview

Flasher, 18-m Shunt, Extremly Low Current Consumption

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
– 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
–31
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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