器件名称: U2044B
功能描述: DUAL OUTPUT FLASHER
文件大小: 215.44KB 共8页
简 介:Features
Temperature and Supply Voltage Compensated Flashing Frequency Frequency Doubling Indicates Lamp Outage Two Relay Driver Outputs 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 Extremly Low Current Consumption < 10 A (with Switches Open) Reverse Polarity Protection Three Control Inputs: Left, Right and Hazard Warning
Dual Output Flasher U2044B
Description
The integrated circuit U2044B is used in relay-controlled automotive flashers. With two output stages, each side of the vehicle is controlled separately. A left and a right direction indicator input with only a small control current makes switch contacts for small loads possible. The separate hazard warning input simplifies the construction of the hazard switch. Lamp outage is indicated by frequency doubling during direction mode. Thanks to extreme low current consumption the U2044B can be directly connected to the battery.
Rev. 4721A–AUTO–05/03
1
Figure 1. Block Diagram
30
9 5 RShunt C1 4.7 F K1 Contact 1 14 R1 82 k W 1 + 7 + + V S-6 V 27.5 V 11 13 GND R2 220 W Hazard warning R4 4.7 k W R6 4.7 k W right 10 3 2 4 R3 4.7 k W R10 1.2 k W + 12 V Ref2 V S /2 + V Ref1 6 R9 47 k W R8 47 k W 2 + V S-81 mV 8 30 m W
30
30
Relay 1 2
15 left 31
12700
R5 1.2 k W
R7 1.2 k W
2
U2044B
4721A–AUTO–05/03
U2044B
Pin Configuration
Figure 2. Pinning DIP14/SO14
OSC 1 SIL 2 SIR 3……