TL431A 查看數據表（PDF） - Unspecified

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TL431A

PROGRAMMABLE PRECISION SHUNT REGULATOR

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PROGRAMMABLE PRECISION SHUNT REGULATOR TL431/A/C

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 :

(

VI(dev)

) × 106

αVREF (ppm/℃) =

VREF at 25℃

ΔTA

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 VREF=2492mV at 0℃, VREF=2495mV at 25℃,

ΔTA=70℃ for TL431C.

( 4mV )×106

αVREF =

2495mV

70℃

≈23ppm/℃

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

Calculating Dynamic Impedance

The dynamic impedance is defined as :

Z KA

= ΔVKA

ΔIKA

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

Z'

ΔV

= ΔI

≈

Z KA

(1 + R1/R2 )

Dec. 2010 – Rev.1.5

-6-

HTC

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