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PDF U644B-FP Data sheet ( Hoja de datos )
| Número de pieza | U644B-FP | |
| Descripción | Flasher/ 18-m Shunt/ Extremly Low Current Consumption | |
| Fabricantes | TEMIC Semiconductors | |
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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)
1 page  
Package Information
Package DIP8
Dimensions in mm 9.8
9.5
1.64
1.44
7.77
7.47
4.8 max
0.5 min 3.3
0.58
0.48 2.54
7.62
85
6.4 max
0.36 max
9.8
8.2
technical drawings
according to DIN
specifications
13021
14
Package SO8
Dimensions in mm
5.00
4.85
5.2
4.8
3.7
1.4
0.4
0.25 0.2
0.10 3.8
1.27 6.15
3.81 5.85
85
technical drawings
according to DIN
specifications
85
13034
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
U644B
5 (6)
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet U644B-FP.PDF ] | |
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