Copyright  ANPEC Electronics Corp.

Rev. A.3 - May., 2003

APL1431

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Adjustable Precision Shunt Regulator

Features

General Description

Applications

The APL1431 is a 3-terminal adjustable voltage ref-

erence with specified thermal stability over applicable

commercial temperature ranges. Output voltage may

be set to any value between V

two external resistors (see Figure 2). When used

with an photocoupler, the APL1431 is an ideal volt-

age reference in isolated feedback circuits for 2.5V

to 12V switching-mode power supplies. This device

has a typical output impedance of 0.1

Ω. Active out-

put circuitry provides a very sharp turn-on

characteristic,making the APL1431 excellent replace-

ments for zener diodes in many applications, includ-

ing on-board regulation and adjustable power

supplies.

•••••

Precise Reference Voltage to 2.500V

•••••

Guaranteed 0.5% or 1% Reference Voltage

Tolerance

•••••

Sink Current Capability , 1mA to 100mA

•••••

Quick Turn-on

•••••

Adjustable Output Voltage , V

•••••

Low Operational Cathode Current , 250µA

Typical

•••••

0.1

Ω Typical Output Impedance

•••••

SOT-23 , SOT-89 and TO-92 Packages

•••••

Linear Regulators

•••••

Adjustable Power Supply

•••••

Switching Power Supply

Symbol

Functional Diagram

+

_

Cathode

REF

Anode

SOT-23 (Top View)

REF

ANODE

CATHODE

12

3

SOT-89 (Top View)

REF

ANODE

CATHODE

12

3

REF

ANODE

CATHO DE

1

2

3

TO-92 (Top View)

Cathode

Anode

REF