U479B

更新时间： 2024-11-01 22:18:19

品牌	Logo	应用领域
爱特美尔 - ATMEL		监控
页数	文件大小	规格书
8页	142K
描述
Automotive Lamp-outage Monitor IC

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U479B 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

• Interference and Damage-protection According to VDE 0839

• EMI Protection

• Reversal Polarity Protection

• Load-dump Protection

Automotive

Lamp-outage

Monitor IC

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. Schematic and Application Circuit

V_S

V_Batt

R_sh

Z₂

OUT1

0.6 V_S

R_sh

OUT2

R₁

150 Ω

Lamps

Rev. 4775A–AUTO–11/03

12 3 4 5 6 7 8

中文翻译

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