TL431 查看數據表（PDF） - Wing Shing International Group

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TL431

Adjustable Precision Shunt Regulator

Wing Shing International Group 

WS

TL431

Note: 1. The deviation parameters VREF(dev) and IREF(dev) are defined as the differences between the maximum and minimum

values obtained over the rated temperature range.

VREF(dev) = VREF(max) - VREF(min)

The equivalent full-range temperature coefficient of the reference input voltage, αVREF is defined as:

( ) V REF(dev)

× 10 6

) ppm

=

V REF@ ° C

( αVREF

°C

∆ Ta

where ∆Ta is the rated 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.

2. The dynamic impedance is defined as:

∆ VKA

ZK A =

∆ IK

When the device is operated with two external resistors (see Figure 2), the total dynamic impedance of the circuit is

given by:

∆V

R1

Z' =

= ZK A (1+ )

∆I

R2

TEST CIRCUITS

Fig.1. Test Circuit for VKA = VREF

Fig.2. Test Circuit for VKA ≥ VREF

Fig.3. Test Circuit for Ioff

4-3

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