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參數資料
| 型號： | U644B-FP |
| 英文描述： | Flasher, 18-m Shunt, Extremly Low Current Consumption |
| 中文描述： | 閃光器，18米分流，Extremly低電流消耗 |
| 文件頁數： | 1/6頁 |
| 文件大?。?/td> | 202K |
| 代理商： | U644B-FP |
U644B
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
1 (6)
Flasher, 18-m 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
Frequency doubling indicates lamp outage
Frequency independent of temperature and voltage
change
Relay driver output with high current-carrying
capacity and low saturation voltage
Minimum lamp load for flasher operation:
1 W
Very low susceptibility to EMI
Protection according to ISO TR7637/1 level 4
Control input (Kl 15)
Ordering Information
Extended Type Number
U644B
U644B-FP
Package
DIP8
SO8
Remarks
Block Diagram
V
S
–49 mV
Pulse
generator
GND
20 k
3.3 k
Relay
7
15
49 a
4
5
K
2
K
1
K
3
C
1
R
1
2
12707
R
3
49 a
Comparator K
2
49 a
Comparator K
3
2 k
20 k
20 k
20 k
13 k
30 V
6
3
8
1
Shunt
R
4
GND
–31
R
5
10 k
30
18 m
Measuring
comparator K
1
220
R
2
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
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