Low-power Flasher IC with 18-mOMShunt
Features
• Temperature and Voltage Compensated Frequency • Warning Indication of Lamp Failure by Means of Frequency Doub...
Description
Features
Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Frequency Doubling only in Direction
Mode Voltage Dependence of the Car Indicator Lamps also Compensated for Lamp Failure Relay Output with High Current-carrying Capacity and Low Saturation Voltage Load-dump Protection Minimum Lamp Load for Flasher Operation ³ 1 W Low Susceptibility to EMI Extremely Low Standby Current of 10 µA Protection According to ISO/TR 7637/1 Level 4 with External Capacitor (C2)
Description
The U6432B is an advanced automotive flasher IC which provides low standby current. Its basic function is equal to Atmel’s flasher IC U6043B but low current consumption and frequency doubling disabling make outstanding differences.
Low-power Flasher IC with 18-mW Shunt U6432B
4725A–AUTO–06/03
1
Block Diagram
Figure 1. Car Flasher Application
VS
6
G5
2
K3
+ -
V S-57 mV
VS
D1 21 V T1 C2 10 µF
G3 C1 4.7 µF
K2
+ 6.2 V D2
+ R1 82 kW G4 5 4 -
K1
V S-57 mV
G2
G1
T2 V S-6 V
49 a 3 Shunt VS R3 18 mW R4 5.1 kW R6 470 W 7 8 1
R2 1.2 kW
PL >1 W
2
U6432B
4725A–AUTO–06/03
U6432B
Pin Configuration
Figure 2. Pinning
GND VS REL 1 2 8 7 SI LD
U6432B
3 4 6 5 VS OSC
OSC
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND VS REL OSC OSC VS LD SI Function IC ground Supply voltage Relay driver Oscillator Oscillator Supply voltage Lamp failure detection Start input (49a)
3
4725A–AUTO–06/03
Functional Description
Pin 1, GND
The U6432B is protected...
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