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U6433B

ATMEL Corporation
Part Number U6433B
Manufacturer ATMEL Corporation
Description Frequency Doubling Disabling
Published Jun 14, 2007
Detailed Description Features • • • • • • • • Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Fr...
Datasheet PDF File U6433B PDF File

U6433B
U6433B

Overview
Features • • • • • • • • Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Frequency Doubling can be Disabled Voltage Dependence of the Car Indicator Lamps Compensated for Lamp Failure Relay Output with High Current Carrying Capacity and Low Saturation Voltage Minimum Lamp Load for Flasher Operation ≥ 1W Load-dump Protection Very Low Susceptibility to EMI Protection According to ISO/TR 7637/1 Level 4 1.
Description The design of the U6433B is similar to that of U6043B, both devices have the same excellent EMC (Electro Magnetic Capability) and protection features.
The U6433B includes an additional 8-mV comparator and a logical connection with the frequency doubling stage.
This combination can be used for a hazard switch which bypasses the external shunt resistor to disable the frequency doubling.
This feature is especially important with respect to the US automotive industry.
During direction mode the U6433B works like other flashers, that is, frequency doubling in the case of lamp outage.
www.
DataSheet4U.
com Flasher, 18-mΩ Shunt, Frequency Doubling Disabling U6433B Rev.
4810B–AUTO–10/05 Figure 1-1.
Block Diagram 6 G5 2 + K1 + K4 VS - 8 mV VS - 49 mV VS C1 4.
7 µF + K5 G4 5 G2 D1 23 V R1 82 kΩ 4 VS - 4 V K2 K3 49 a VS - 6 V 3 7 VS - 8 V 8 1 Shunt VS R3 R4 470 Ω 18 mΩ R2 PL >1 W 1.
5 kΩ 2 U6433B 4810B–AUTO–10/05 U6433B 2.
Pin Configuration Figure 2-1.
Pinning SO8 GND 1 8 SI VS 2 7 LD U6433B REL 3 6 VS OSC 4 5 OSC Table 2-1.
Pin 1 2 3 4 5 6 7 8 Pin Description 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 4810B–AUTO–10/05 3.
Functional Description 3.
1 Pin 1, GND The integrated circuit is protected against damage via resistor R4 to ground (–31) in the case of battery reversal.
An integrated protection circuit together with external resistances R2 and R4 limits the current pul...


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