Copyright  ANPEC Electronics Corp.

Rev. C.1 - Jun., 2003

APL431

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 APL431 is a 3-terminal adjustable voltage refer-

ence 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 APL431 is an ideal voltage

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 output cir-

cuitry provides a very sharp turn-on characteristic,

making the APL431 excellent replacements for ze-

ner diodes in many applications, including on-board

regulation and adjustable power supplies.

Voltage Tolerance

Typical

•••••

0.1

Ω Typical Output Impedance

and TO-92S Packages

•••••

Linear Regulators

•••••

Adjustable Power Supply

•••••

Switching Power Supply

Cathode

Anode

REF

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

CATHODE

3

2

1

TO-92 (Top View)

SO-8 (Top View)

REF

ANODE

CATHODE

ANODE

NC

ANODE

ANODE

NC

1

2

3

4

8

7

6

5

REF ANO DE

NC

NC

CATHO DE

12

3

4

5

SOT-23-5 (Top View)

REF

ANODE

CATHODE

3

2

1

TO-92S (Top View)