APL1431 Datasheet, PDF (1/12 Pages) Anpec Electronics Coropration – Adjustable Precision Shunt Regulator

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
Applications
• Linear Regulators
• Adjustable Power Supply
• Switching Power Supply
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
CATHODE REF
SOT-23 (Top View)
Symbol
REF
Anode
Cathode
1
2
3
CATHODE ANODE REF
Functional Diagram
Cathode
REF
+
_
Vref
SOT-89 (Top View)
1 REF
2 ANODE
3 CATHODE
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.
1
Rev. A.3 - May., 2003
www.anpec.com.tw