WSL
431
Adjustable Precision Shunt Regulator
Features
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Precise Reference Voltage to 2.505V
Guaranteed 0.5%, 1% and 2% Reference
Voltage Tolerance
Sink Current Capability, 1mA to 100mA
Quick Turn-on
Adjustable Output Voltage, Vo = V
ref
to 20V
Low Operational Cathode Current, 150μA
Typical
0.1Ω Typical Output Impedance
SOT-89 , TO-92 and SOT-23 Packages
This device has a typical output impedance of
o.1Ω. Active output circuitry provides a very
sharp turn-on characteristic, making the
WSL431 excellent replacements for zener diodes
in many applications, including on-board
Regulation and adjustable power supplies.
Applications
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Linear Regulators
Switching Power Supply
REF ANODE CATHODE
• Adjustable Power Supply
General Description
The WSL431 is a 3 terminal adjustable voltage
reference with specified thermal stability over
applicable commercial temperature ranges.
Output voltage may be set to any value between
Vref (2.505V) and 20V with two external
resistors (see Figure 2).
When used with a photocoupler, the WSL431 is
an ideal voltage reference in isolated feedback
circuits for 2.505V to 12V switching-mode
power supplies.
SOT-89 (Top View)
TO-92
SOT-23 (Top View)
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)
WINSON [ WINSON SEMICONDUCTOR CORP. ]
