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U644B-FP PDF Data sheet ( 特性 )

部品番号 U644B-FP
部品説明 Flasher/ 18-m Shunt/ Extremly Low Current Consumption
メーカ TEMIC Semiconductors
ロゴ TEMIC Semiconductors ロゴ 



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U644B-FP Datasheet, U644B-FP PDF,ピン配置, 機能
U644B
Flasher, 18-mW 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 Relay driver output with high current-carrying
capacity and low saturation voltage
D Minimum lamp load for flasher operation: 1 W
D Very low susceptibility to EMI
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
R5
10 kW
26
C1
4
Measuring
comparator K 1
VS – 49 mV
K1
20 kW
20 kW
7
K2 2 kW
Pulse
R1 generator
49 a
WComparator K 2 20 k
K3
5
W49 a
Comparator K 3 20 k
13 kW
GND
3
Relay
8 R3
3.3 kW
30 V
1
R2
220 W
GND
–31
Figure 1. Application circuit as a car flasher with control input
Resistor R1, R2 and R3: 1/4 Watt
R2 for protection against continuous reversed polarity: 1 Watt
R4 18 mW
Shunt
49 a
15
30
12707
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
1 (6)

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Flasher/ 18-m Shunt/ Extremly Low Current Consumption

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