LM432AN3 datasheet(1/9 Pages) CYSTEKEC

No. de pieza	LM432AN3

Descripción Electrónicos	Adjustable shunt regulator

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Fabricante Electrónico	CYSTEKEC [Cystech Electonics Corp.]

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CYStech Electronics Corp.

Spec. No. : C504N3

Issued Date : 2003.03.21

Revised Date : 2005.10.07

Page No. : 1/9

LM432XA3/N3

CYStek Product Specification

Adjustable shunt regulator

LM432XA3/N3

Description

Features

The LM432 is a three terminal adjustable shunt

◆

Low voltage operation(down to 1.24V)

regulator with thermal stability guaranteed over

◆

Wide operating current range 80μA to 100mA

temperature. The output voltage can be adjusted

◆

Low dynamic output impedance 0.05Ω typ.

to any value from 1.24V(VREF) to 20V with two

◆

Trimmed bandgap design ±0.25%

external resistors. The LM432 has a typical dynamic

◆

Upgrade for LM431

output impedance of 0.05Ω. Active output circuitry

◆

Available in TO-92 and SOT-23 packages

provides a very sharp turn on characteristic, making

the LM432 an excellent replacement for zener diodes.

Applications

The LM432 shunt regulator is available with four

◆

Linear Regulators

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

◆

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:

VOUT=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 VIN(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:

Rmin

≥VIN(max)/150mA(to limit instantaneous

turn-on Iz)

Rmin

≥ VIN(max)-VOUT

(to limit Iz under

IOUT(min)+100mA

normal operating

conditions)

VIN

GND

R

R1

R2

VREF

PL432

VOUT

LM432

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