TL431Z datasheet(5/10 Pages) HTC

5 / 10 page

PROGRAMMABLE PRECISION SHUNT REGULATOR

TL431Z/AZ/CZ

2009 – Obsolete

- 5 -

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 :

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 , m

℃

aximum VREF=2492mV at 0 , V

℃

REF=2495mV at 25

℃

ΔTA=70

for TL431C

℃

ppm

REF

≈

⎟

⎠

⎞

⎜

⎝

⎛

2495

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

Calculating Dynamic Impedance

The dynamic impedance is defined as :

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

⎟

⎠

⎞

⎜

⎝

⎛ +

≈

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