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PDF U479B Data sheet ( Hoja de datos )
| Número de pieza | U479B | |
| Descripción | Automotive Lamp-outage Monitor IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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 Ω
VBatt
5 OUT1
3
OUT2
Rev. 4775A–AUTO–11/03
1 page  
Ordering Information
Extended Type Number
U479B
U479B-FP
Package
DIP8
SO8
Remarks
–
–
Package Information
Package DIP8
Dimensions in mm 9.8
9.5
1.64
1.44
7.77
7.47
4.8 max
0.5 min 3.3
0.58
0.48
2.54
7.62
85
6.4 max
0.36 max
9.8
8.2
technical drawings
according to DIN
specifications
14
U479B
4775A–AUTO–11/03
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U479B.PDF ] | |
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