APL431 Datasheet, PDF (1/16 Pages) Anpec Electronics Coropration – Adjustable Precision Shunt Regulator

APL431
Adjustable Precision Shunt Regulator
Features
• Precise Reference Voltage to 2.500V
• Guaranteed 0.5%, 1% or 2% 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-23-5, SOT-89, SO-8, TO-92
and TO-92S Packages
Applications
• Linear Regulators
• Adjustable Power Supply
• Switching Power Supply
Symbol
REF
Anode
Cathode
Functional Diagram
Cathode
REF
+
_
Vref
General Description
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_ref (2.5 V) and 20 V with
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 0.1Ω. 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.
ANODE
3
1
2
NC
NC
5
4
123
REF CATHODE
SOT-23 (Top View)
REF ANODE CATHODE
SOT-23-5 (Top View)
1
2
3
REF ANODE CATHODE
CATHODE 1
ANODE 2
ANODE 3
NC 4
8 REF
7 ANODE
6 ANODE
5 NC
SOT-89 (Top View)
SO-8 (Top View)
3 CATHODE
2 ANODE
1 REF
3 CATHODE
2 ANODE
1 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.
1
Rev. C.1 - Jun., 2003
www.anpec.com.tw