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U479B Datasheet, PDF (1/5 Pages) ATMEL Corporation – Automotive Lamp-outage Monitor IC
U479B
Automotive Lamp Outage Monitor, VT = 8 mV
Description
The monolithic integrated bipolar circuit, U479B, is
designed as a monitor for lamp failure in automobiles.
The comparator threshold is matched to the PTC
characteristic of incandescent lamps. The threshold is
tied to V4,6 = VS – VT whereas VT = 8 mV.
If the voltage drop across shunt resistor, Rsh, exceeds
8 mV, the output is turned off, otherwise the output is
turned on. Without supply voltage or open input Pin 8, the
output is turned off. A not used comparator input must be
connected to Pin 7.
Features
D 2 kV–ESD protection
D Two comparators with common reference
D Tight threshold tolerance
D Threshold matched to PTC characteristic
of incandescent lamps
D Temperature compensated
D NPN output
D Interference and damage–protection
according to VDE 0839
D EMI protection
D Reversal polarity protection
D Load-dump protection
Ordering Information
Extended Type Number
U479B
U479B–FP
Package
DIP8
SO8
Remarks
Block Diagram
VS
2
7
Rsh
Z2
4
–
&
+
Rsh
8
0.6 VS
–
+
–
+
&
6
Lamps
1
R1 150 W
Figure 1. Schematic and application circuit
VBatt
5 OUT1
3 OUT2
95 10380
TELEFUNKEN Semiconductors
1 (5)
Rev. A2, 04-Feb-97