APL431
Adjustable Precision Shunt Regulator
Features
General Description
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•
Precise Reference Voltage to 2.500V
The APL431 is a 3-terminal adjustable voltage reference
Guaranteed 0.5%, 1% or 2% Reference
with specified thermal stability over applicable
commercial temperature ranges. Output voltage may
Voltage Tolerance
•
•
•
•
be set to any value between Vref (2.5 V) and 20 V with
Sink Current Capability, 1mA to 100mA
two external resistors (see Figure 2). When used with
Quick Turn-on
an photocoupler, the APL431 is an ideal voltage
Adjustable Output Voltage, VO = Vref to 20V
reference in isolated feedback circuits for 2.5V to 12V
switching-mode power supplies. This device has a
Typical
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•
Low Operational Cathode Current, 250µ A
typical output impedance of 0.1Ω. Active output circuitry
0.1Ω Typical Output Impedance
provides a very sharp turn-on characteristic, making
the APL431 excellent replacements for zener diodes
SOT-23, SOT-23-5, SOT-89, SO-8, TO-92 and
in many applications, including on-board regulation and
TO-92S Packages
•
adjustable power supplies.
Lead Free Available (RoHS Compliant)
NC
NC
5
4
ANODE
Applications
3
1
•
•
•
2
1
2
3
Linear Regulators
REF
CATHODE
Adjustable Power Supply
SOT-23 (Top View)
Switching Power Supply
Symbol
REF ANODE CATHODE
SOT-23-5 (Top View)
CATHODE
Anode
2
Functional Diagram
ANODE
3
6
ANODE
4
5
NC
3
Cathode
REF
REF
7
NC
1
8
2
ANODE
REF
1
ANODE
ANODE CATHODE
SOT-89 (Top View)
SO-8 (Top View)
Cathode
3
3
CATHODE
2
ANODE
2
ANODE
1
+
REF
CATHODE
REF
1
REF
_
V ref
TO-92 (Top View)
TO-92S (Top View)
Anode
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.
Copyright © ANPEC Electronics Corp.
Rev. C.4 - Sep., 2006
1
www.anpec.com.tw
