APL1431
Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
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
O
= V
REF
to 20V
Low Operational Cathode Current , 250µA
Typical
0.1Ω Typical Output Impedance
SOT-23 , SOT-89 and TO-92 Packages
General Description
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
ref
(2.5 V) and 20 V with
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 0.1Ω. 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.
ANODE
3
1
2
Applications
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•
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Linear Regulators
Adjustable Power Supply
Switching Power Supply
CATHODE REF
SOT-23 (Top View)
Symbol
REF
Anode
Cathode
1
2
3
CATHODE
ANODE
REF
Functional Diagram
C athode
SOT-89 (Top View)
1
REF
2
ANOD E
REF
+
_
3
CATHO DE
V
ref
TO-92 (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. A.3 - May., 2003
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
