Datasheet > SC431CZ-2TRA

SC431CZ-2TRA

更新时间： 2024-10-02 19:53:15

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Regulator

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SC431CZ-2TRA 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.84
Base Number Matches：	1

SC431CZ-2TRA 数据手册

SC431

Adjustable Shunt Regulator

POWER MANAGEMENT

Description

Features

The SC431 is a three terminal adjustable shunt

regulator with thermal stability guaranteed over

temperature. The output voltage can be adjusted to any

value from 2.5V (V_REF) to 36V with two external

resistors. The SC431 has a typical dynamic output

impedance of 0.25W. Active output circuitry provides a

very sharp turn on characteristic, making the SC431 an

excellent replacement for zener diodes.

u Wide operating current range 100µA to 150mA

u Low dynamic output impedance 0.25 W typ.

u Trimmed bandgap design + 0.5%

u Alternate for TL431, LM431 & AS431

u Industrial temperature range

u Available in SOT-23-3, SO-8 and TO-92 packages

Applications

The SC431 shunt regulator is available with three

voltage tolerances (0.5%, 1.0% and 2.0%) and three

package options (SOT-23-3, SO-8 and TO-92). This

allows the designer the opportunity to select the

optimum combination of cost and performance for their

application.

u Linear Regulators

u Adjustable Supplies

u Switching Power Supplies

u Battery Operated Computers

u Instrumentation

u Computer Disk Drives

Typical Application Circuit⁽¹⁾⁽²⁾

Notes:

1) Set V_OUTaccording to the following equation:

V_OUT= V_REF1+

+I_REFR1

2) Choose the value for R as follows:

The maximum limit for R should be such that the

cathode current, I_Z, is greater than the minimum

operating current (100µA) at V_IN(MIN)

The minimum limit for R should be such that I_Zdoes

not exceed 150mA under all load conditions, and the

instantaneous turn-on value for I_Zdoes not exceed

200mA. Both of the following conditions must be met:

IN(max)

R_min

≥

(to limit instantaneous turn-on I_Z)

200mA

_IN(max)− V_OUT

R_min

(to limit I_Zunder normal

I_OUT(min)+150mA

operating conditions)

Revision 1, January 2001

www.semtech.com

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