TL431CDBVT datasheet(21/78 Pages) TI1

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9 Detailed Description

9.1 Overview

This standard device has proven ubiquity and versatility across a wide range of applications, ranging from power

to signal path. This is due to its key components containing an accurate voltage reference & opamp, which are

very fundamental analog building blocks. TL43xx is used in conjunction with its key components to behave as a

single voltage reference, error amplifier, voltage clamp or comparator with integrated reference.

TL43xx can be operated and adjusted to cathode voltages from 2.5V to 36V, making this part optimum for a

wide range of end equipments in industrial, auto, telecom & computing. In order for this device to behave as a

shunt regulator or error amplifier, >1mA (Imin(max)) must be supplied in to the cathode pin. Under this condition,

feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference voltage.

Various reference voltage options can be purchased with initial tolerances (at 25°C) of 0.5%, 1%, and 2%. These

reference options are denoted by B (0.5%), A (1.0%) and blank (2.0%) after the TL431 or TL432. TL431 &

TL432 are both functionaly, but have separate pinout options.

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.

9.2 Functional Block Diagram

CATHODE

REF

ANODE

Vref

Figure 9-1. Equivalent Schematic

ANODE

REF

CATHODE

2.4 kΩ

7.2 kΩ

3.28 kΩ

20 pF

4 kΩ

1 kΩ

800 Ω

20 pF

150 Ω

10 kΩ

Figure 9-2. Detailed Schematic

www.ti.com

TL431, TL432

SLVS543R – AUGUST 2004 – REVISED OCTOBER 2023

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