General Description

The APL431L is a 3-terminal low voltage adjustable precision reference with specified thermal stability over applicable commercial temperature ranges. Output voltage may be set to any value between Vref (1. 24 V) and 20 V with two external resistors (see Figure 2). When used with an photocoupler, the APL431L is an ideal voltage reference in isolated feedback circuits for 3V to 12V switching-mode power supplies. This device has a typical output impedance of 0.1Ω. Active output circuitry provides a very sharp turn-on characteristic,making the APL431L excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies.

Features

• Precise Reference Voltage to 1.24V

• Guaranteed 0.5 or 1 Reference Voltage Tolerance

• Sink Current Capability, 80uA to 100mA

• Quick Turn-on

• Adjustable Output Voltage, VO = VREF to 20V

• Low Operational Cathode Current, 80µA Typical

• 0.1Ω Typical Output Impedance

• SOT-23-3, SOT-23-5, TO-92 and SOT-89 Packages

• Lead Free Available (RoHS Compliant)

Applications

• Linear Regulators

• Adjustable Power Supply

• Switching Power Supply