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PDF ( 数据手册 , 数据表 ) U479B

零件编号 U479B
描述 Automotive Lamp-outage Monitor IC
制造商 ATMEL Corporation
LOGO ATMEL Corporation LOGO 


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U479B 数据手册, 描述, 功能
Features
2-kV ESD Protection
Two Comparators with Common Reference
Tight Threshold Tolerance
Threshold Matched to PTC Characteristic of Incandescent Lamps
Temperature Compensated
NPN Output
Interference and Damage-protection According to VDE 0839
EMI Protection
Reversal Polarity Protection
Load-dump Protection
Description
The monolithic integrated bipolar circuit, U479B, is designed as a monitor for lamp fail-
ure in automobiles. The comparator threshold is matched to the PTC characteristic of
incandescent lamps. The threshold is tied to V4,6 = VS - VT where VT = 8 mV.
If the voltage drop across the 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 comparator input, which is not used, must be connected to
pin 7.
Automotive
Lamp-outage
Monitor IC
U479B
Figure 1. Schematic and Application Circuit
VS
2
7
Rsh
Z2
4
-
+
Rsh
8
0.6 VS
-
+
&
-
+&
6
Lamps
1
R1 150
VBatt
5 OUT1
3
OUT2
Rev. 4775A–AUTO–11/03







U479B pdf, 数据表
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