U6433B
Flasher, 18-m
W
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 fea-
ture 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
y
1W
Protection according to ISO/TR 7637/1 level 4
Ordering Information
Extended Type Number
U6433B–FP
Package
SO8
Remarks
Block Diagram
6
G
5
2
+
K
1
–
+
K
4
–
V
S
– 8 mV
4
+
K
5
–
G
2
V
S
– 4 V
K
2
V
S
– 49 mV
V
S
C
1
4.7
m
F
D
1
23 V
82 k
W
5
R
1
G
4
K
3
49 a
V
S
–6 V
3
7
V
S
– 8 V
8
1
Shunt
V
S
R
3
18 m
R
4
W
R
2
1.5 k
W
470
W
P
L
>1 W
94 9289
Figure 1. Application circuit as a car flasher
TELEFUNKEN Semiconductors
Rev. A3, 25-Feb-97
1 (5)
TEMIC [ TEMIC SEMICONDUCTORS ]
