Datasheet > MIC4043YM4

MIC4043YM4

更新时间： 2024-09-30 10:57:03

品牌	Logo	应用领域
MIC		稳压器光电二极管
页数	文件大小	规格书
12页	448K
描述
Low-Voltage Secondary-Side Shunt Regulator Final Information

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MIC4043YM4 数据手册

MIC4043

Micrel

MIC4043

Low-Voltage Secondary-Side Shunt Regulator

Final Information

General Description

Features

The MIC4043 is a shunt regulator optimized for secondary-

side regulation in low-voltage power supplies. Featuring an

output stage guaranteed to swing within 400mV of ground,

the MIC4043 can be used in power supplies operating down

to1.8V, evenwithoptoisolatorsrequiringgreaterthan1.2Vof

headroom.

• Ideal for 1.8V switching converters

• Low-voltage operation

400mV maximum saturation over

operating temperature range

• Easy to use

voltage in, current out

• 2% voltage tolerance over operating temperature range

In power supply applications, the MIC4043 normally drives

theLEDofanopticallyisolatedfeedbackcircuit.TheMIC4043

monitors a resistively-divided output voltage and sinks error

current through the optoisolator’s LED (secondary side); the

optoisolator’s transistor (primary side) provides this signal to

thecontroller’sfeedbackinput. TheMIC4043isalsopractical

for other voltage-monitoring applications requiring an open-

collector output.

Applications

• Optically isolated low-volage power supplies

• Low-voltage discrete regulator control

The MIC4043 replaces conventional ’431-type shunt regula-

tors to allow low-voltage applications where there is inad-

equate headroom for a 2.5V regulator in series with an

optoisolator. Replacing ’431-type devices requires only a

minor change to the way that the resistive-divider values are

calculated.

Typical Application

OPTICAL

ISOLATION

MIC4043

IN SNK

GND FB

MIC4043

Low-Side Feedback

V_IN

COMPENSATION

Control

V_OUT

MIC38HC43BN

Return

COMP

V_REF

V_DD

I_SNS

V_OUT

GND

= 1.245V

OUT

R_T/C_T

200kHz DC-DC Flyback Converter

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

November 2000

MIC4043

12 3 4 5 6 7...12

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