1 Features

• No output capacitor required

• Stable with all capacitive loads

• Reference voltage tolerance at 25°C

– 1% (A grade)

• Adjustable output voltage: Vref to 36V

• Operation from −40°C to 125°C

• Typical temperature drift (TLA43xA)

– 8mV (I temp)

– 11mV (Q temp)

• Low Output Noise

• 0.2Ω Typical output impedance

• Sink-current capability: 0.2mA to 100mA

• Pin-compatible with industry-standard TL431 and

TL432

2 Applications

• Rack server power

• Industrial AC/DC

• AC inverter & VF drives

• Servo drive control module

• Notebook PC power adapter design

3 Description

The TLA431 and TLA432 devices are three-terminal

adjustable shunt regulators that are stable with all

capacitor loads. The devices are pin compatible with

the industry standard TL431 and TL432 but with

improved stability to support all capacitor loads. The

output cathode voltage can be set to any value

between Vref (2.495V) and 36V, with two external

resistors. These devices have a typical output

impedance of 0.2Ω. Active output circuitry provides

a very sharp turn-on characteristic, making these

devices excellent replacements for Zener diodes

in many applications, such as onboard regulation,

adjustable power supplies, and switching power

supplies. The TLA431 also functions as a comparator

for undervoltage monitoring. The internal amplifier and

reference of the TLA431 is used an error amplifier

in isolated optocoupler flyback power supplies. The

TLA432 device has exactly the same functionality and

electrical specifications as the TLA431 device.

The TLA431 and TLA432 devices are specified in two

temperature grades, I and Q. In addition, the devices

offer good stability reference voltage over the entire

temperature range.