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1 Features

? Reference voltage tolerance at 25°C

– 0.5% (B grade)

– 1% (A grade)

– 2% (Standard grade)

? Adjustable output voltage: Vref to 36V

? Operation from ?40°C to 125°C

? Typical temperature drift (TL43xB)

– 6mV (C temp)

– 14mV (I temp, Q temp)

? Low Output Noise

? 0.2Ω Typical output impedance

? Sink-current capability: 1mA to 100mA

2 Applications

? Rack server power

? Industrial AC/DC

? AC inverter & VF drives

? Servo drive control module

? Notebook PC power adapter design

3 Description

The TL431 and TL432 devices are three-terminal

adjustable shunt regulators, with specified thermal

stability over applicable automotive, commercial, and

military temperature ranges. The output voltage can

be set to any value between Vref (approximately

2.5V) and 36V, with two external resistors. These

devices have a typical output impedance of 0.2Ω.

Active output circuitry provides a very sharp turnon

characteristic, making these devices excellent

replacements for Zener diodes in many applications,

such as on-board regulation, adjustable power

supplies, and switching power supplies. The TL432

device has exactly the same functionality and

electrical specifications as the TL431 device, but has

different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in

three grades, with initial tolerances (at 25°C) of

0.5%, 1%, and 2%, for the B, A, and standard

grade, respectively. In addition, low output drift versus

temperature verifies good stability over the entire

temperature range.

The TL43xxC devices are characterized for operation

from 0°C to 70°C, the TL43xxI devices are

characterized for operation from –40°C to 85°C, and

the TL43xxQ devices are characterized for operation

from –40°C to 125°C.