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U643 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 U643
部品説明 Flasher/ 30-mohm Shunt
メーカ ATMEL Corporation
ロゴ ATMEL Corporation ロゴ 



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U643 Datasheet, U643 PDF,ピン配置, 機能
Flasher, 30-mW Shunt
U643B
Description
The bipolar integrated circuit U643B is used in relay-
controlled automotive flashers where a high-level EMC
is required.
Lamp outage is indicated by frequency doubling during
hazard warning as well as direction mode.
Features
D Temperature and supply voltage compensated
flashing frequency
D Frequency doubling indicates lamp outage
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/TR 7637/1 level 4
Block Diagram
C1
4
6
Measuring comparator K 1
V6–81 mV
K1 20 kW
2
5 kW
7
R3
Shunt
30 mW
+ VS
+ 49
K2
R1
Pulse
generator
49 a–Comparator K2
20 kW
49 a–Comparator K3
K3
5
20 kW
95 9756
3
Relay
8 R2
23 V
5 kW
IC Ground
1
1.5...2.2 kW
R4
470 W
49 a
5 W 21 W 21 W 21 W 21 W 5 W
GND
– 31
Indicator lamps
Figure 1. Application circuit as a car flasher, Resistor R1 and R2: 1/4 Watt
R4 for protection against continuous reversed polarity: 0.5 Watt
Ordering Information
Extended Type Number
Package
Remarks
U643B
DIP8
U643B-FP
SO8
Rev. A3, 10-Apr-01
1 (5)

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