Datasheet > U479B_07

U479B_07

更新时间： 2024-11-02 03:25:03

品牌	Logo	应用领域
爱特美尔 - ATMEL		监控
页数	文件大小	规格书
7页	184K
描述
Automotive Lamp-outage Monitor IC

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U479B_07 数据手册

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

Automotive

Lamp-outage

Monitor IC

Interference and Damage-protection According to VDE 0839

EMI Protection

Reversal Polarity Protection

Load-dump Protection

1. 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 V_4,6= V_S– V_Twhere V_T= 8 mV.

U479B

If the voltage drop across the shunt resistor, R_sh, 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.

Figure 1-1. Schematic and Application Circuit

V_S

V_Batt

R_sh

Z₂

OUT1

0.6 V_S

R_sh

OUT2

R₁

150 Ω

Lamps

Rev. 4775B–AUTO–09/05

12 3 4 5 6 7

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