Ioff

VKA

Input

Iref

IKA

VKA

Input

Vref

R1

R2

KA

ref

ref

R1

V

= V

1 +

+ I

× R1

R2

æ

ö

ç

÷

è

ø

Vref

Input

VKA

IKA

9

TL431LI

TL432LI

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SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018

Product Folder Links: TL431LI TL432LI

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Copyright © 2018, Texas Instruments Incorporated

8 Parameter Measurement Information

Figure 14. Test Circuit for VKA = Vref

Figure 15. Test Circuit for VKA > Vref

Figure 16. Test Circuit for Ioff

8.1 Temperature Coefficient

The deviation of the reference voltage, Vref, over the full temperature range is known as VI(dev). The parameter of

VI(dev) can be used to find the temperature coefficient of the device. The average full-range temperature

coefficient of the reference input voltage, αVref, is defined as:

αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the

lower temperature. The full-range temperature coefficient is an average and therefore any subsection of the rated

operating temperature range can yield a value that is greater or less than the average. For more details on

temperature coefficient, check out Voltage Reference Selection Basics.