Datasheet > LM432AN3

LM432AN3

更新时间： 2024-11-25 05:42:23

品牌	Logo	应用领域
全宇昕 - CYSTEKEC		稳压器
页数	文件大小	规格书
9页	225K
描述
Adjustable shunt regulator

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LM432AN3 数据手册

Spec. No. : C504N3

Issued Date : 2003.03.21

Revised Date : 2005.10.07

Page No. : 1/9

CYStech Electronics Corp.

Adjustable shunt regulator

LM432XA3/N3

Description

Features

The LM432 is a three terminal adjustable shunt

regulator with thermal stability guaranteed over

temperature. The output voltage can be adjusted

to any value from 1.24V(V^REF) to 20V with two

external resistors. The LM432 has a typical dynamic

output impedance of 0.05Ω. Active output circuitry

provides a very sharp turn on characteristic, making

◆Low voltage operation(down to 1.24V)

◆Wide operating current range 80μA to 100mA

◆Low dynamic output impedance 0.05Ω typ.

◆Trimmed bandgap design ±0.25%

◆Upgrade for LM431

◆Available in TO-92 and SOT-23 packages

the LM432 an excellent replacement for zener diodes. Applications

The LM432 shunt regulator is available with four

voltage tolerances(0.25%,0.5%,1% and 2%), and two

◆Linear Regulators

◆Adjustable Supplies

package options(TO-92 and SOT-23). This allows the ◆Switching Power Supplies

designer the opportunity to select the optimum combi- ◆Battery Operated Computers

nation of cost and performance for their application.

◆Instrumentation

◆Computer Disk Drives

Typical Application Circuit(Note 1,2)

Notes:

1) Set VOUT according to the following equation:

VIN

VOUT

V^OUT=VREF(1+R1/R2)+IREFR1

2) Choose the value for R as follows:

˙The maximum limit for R should be such that the

cathode current, Iz, is greater than the minimum

operating current(80μA) at VI^N(MIN).

˙The minimum limit for R should be as such that Iz

does not exceed 100mA under all load conditions,

and the instantaneous turn-on value for Iz does not

exceed 150mA. Both of the following conditions

must be met:

VREF

PL432

LM432

GND

Rmin≥V^IN(max)/150mA(to limit instantaneous

turn-on Iz)

Rmin≥ V^IN(max)-VOUT

(to limit Iz under

I^OUT(min)+100mA normal operating

conditions)

LM432XA3/N3

CYStek Product Specification

12 3 4 5 6 7...9

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