+

2.5V

CATHODE

ANODE

REF

VIN

Vout

Vsup

Rsup

R1

R2

VL

RIN

13

TL431LI

TL432LI

www.ti.com

SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018

Product Folder Links: TL431LI TL432LI

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Copyright © 2018, Texas Instruments Incorporated

10 Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

As this device has many applications and setups, there are many situations that this datasheet can not

characterize in detail. The linked application notes help the designer make the best choices when using this part.

Application note Designing with the Improved TL431LI, SNOAA00 provides a deeper understanding of this

device's accuracy in a flyback optocoupler application. Application note Setting the Shunt Voltage on an

Adjustable Shunt Regulator, SLVA445 assists designers in setting the shunt voltage to achieve optimum

accuracy for this device.

10.2 Typical Applications

10.2.1 Comparator With Integrated Reference

Figure 20. Comparator Application Schematic