U479B-M

U479B-M Datasheet


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 where VT = 8 mV.

Part Datasheet
U479B-M U479B-M U479B-M (pdf)
Related Parts Information
U479B-MFPG3Y U479B-MFPG3Y U479B-MFPG3Y
U479B-MFPY U479B-MFPY U479B-MFPY
U479B-MFPG3 U479B-MFPG3 U479B-MFPG3
U479B-MFP U479B-MFP U479B-MFP
U479B-MY U479B-MY U479B-MY
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Automotive Lamp-outage Monitor IC

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 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

Figure Schematic and Application Circuit

Rsh Z2

Rsh 8

VBatt 5 OUT1
3 OUT2

U479B

Lamps
1 R1 150

Pin Configuration

Figure Pinning DIP8/SO8 GND 1 VS 2

OUT2 3 1N1 4

Table Pin 1 2 3 4 5 6 7 8

Pin Description

Symbol Function

Reference point, ground

Supply voltage

OUT2 Output 2

Input 1

OUT1 Output 1

Input 2

VREF Reference voltage

INPUT switch
8 INPUT 7 VREF 6 IN2 5 OUT1
2 U479B

U479B

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Parameters

Value

Unit

Supply voltage

Current consumption, t = 2 ms

Output current

I3,5

Input voltage Reference point pin 7
-V4,6

Power dissipation

Tamb = 95°C
Ordering Information

Extended Type Number U479B-MY U479B-MFPY U479B-MFPG3Y

Package Information

Package DIP8 SO8

Remarks Pb-free Tubed, Pb-free Taped and reeled, Pb-free

Package D IP8

D im en sio ns in m
m ax 9 8
technical draw ings according to D IN s p e c ific a tio n s

U479B

Package SO8

Dimensions in mm
technical drawings according to DIN specifications

History
4775B-AUTO-09/05
• Put datasheet in a new template
• Pb-free logo on page 1 added
• Ordering Information on page 5 changed
6 U479B

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Printed on recycled paper.
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Datasheet ID: U479B-M 519502