Flasher/ 18-m Shunt/ Frequency Doubling Disabling
U6433B
Flasher, 18-mW Shunt, Frequency Doubling Disabling
Description
The design of the U6433B is mainly based on the go...
Description
U6433B
Flasher, 18-mW Shunt, Frequency Doubling Disabling
Description
The design of the U6433B is mainly based on the good results of U6043B in terms of EMC (Electro Magnetic Capability) and protection features. It 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 can be useful in the US automotive industry. During direction mode the U6433B works like other flashers, i.e., frequency doubling in the case of lamp outage. and low saturation voltage
Features
D Temperature and voltage compensated frequency D Warning indication of lamp failure by means of
frequency doubling can be disabled
D Voltage dependence of the car indicator lamps
compensated for lamp failure
D Relay output with high current carrying capacity
D D D D
Minimum lamp load for flasher operation Load-dump protection Very low susceptibility to EMI
y1W
Protection according to ISO/TR 7637/1 level 4
Ordering Information
Extended Type Number U6433B–FP Package SO8 Remarks
Block Diagram
6 G5 2 + K1 – + K4 – V S – 8 mV 4 + K5 – G2 VS – 4 V K2 V S – 49 mV VS
C1 4.7 mF
D1 23 V
82 k W 5
R1
G4
K3
49 a
V S–6 V 3 7
VS – 8 V 8 1
Shunt VS R3
18 m R4
W
R2 1.5 k W
470
W
PL>1 W
94 9289
Figure 1. Application circuit as a car flasher
TELEFUNKEN Semiconductors Rev. A3, 25-Feb-97
1 (5)
U6433B
Pin Description
Pin 1 2 3 4 5 6 ...
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