TL431TA datasheet(6/12 Pages) HTC

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PROGRAMMABLE PRECISION SHUNT REGULATOR

TL431/A/C

Dec. 2010 – Rev.1.5

- 6 -

HTC

The deviation parameters ΔVREF/ΔT and ΔIREF/ΔT are defined as the differences between the maximum and

minimum values obtained over the recommended temperature range. The average full-range temperature

coefficient of the reference voltage, αVREF, is defined as :

REF

I(dev)

REF

ΔT

)

(

)

(ppm/

αV

℃

Where :

ΔTA is the recommended operating free-air temperature range of the device.

αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at

the lower temperature.

Example : Maximum VREF=2496mV at 30 , maximum V

℃

REF=2492mV at 0

, V

℃

REF=2495mV at 25

℃

ΔTA=70

for TL431C.

℃

≈

℃

23ppm/

)

2495mV

4mV

(

αV

REF

Because minimum VREF occurs at the lower temperature, the coefficient is positive.

Calculating Dynamic Impedance

The dynamic impedance is defined as :

ΔI

ΔV

When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by:

()

R1/R2

≈

ΔI

ΔV

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