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General Description

The APL431 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 (2.5 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 0.1?. Active output circuitry provides a very sharp turn-on characteristic, making the APL431 excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies.

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, VO = Vref to 20V

? Low Operational Cathode Current, 250μA Typical

? 0.1? 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