TL431AF datasheet(3/6 Pages) KEC

3 / 6 page

2008. 7. 3

3/6

TL431 Series

Revision No : 0

Input

FIGURE 1-TEST CIRCUIT FOR VKA = Vref

off

Input

FIGURE 3-TEST CIRCUIT FOR I off

FIGURE 2-TEST CIRCUIT FOR VKA > Vref

VKA

Input

Iref

VKA = Vref ( 1+

) + Iref R1

Max.

Min.

AMBIENT TEMPERATURE

Vref (Min.)

Ta = T2 - T1

Vref

Vref = Vref (Max.)

Vref

Example :

Vref = 8.0mV and slope is positive,

Vref at 25 =2.495V,

Ta=70

0.008

Vref =

= 45.8 ppm/

(2.495)

Note 2: The dynamic impedance Zka is defined as:

VKA

|Zka| =

When the device is programmed with two external

resistors, R1 and R2, (refer to Figure 2) the total

dynamic impedance of the circuit is defined as:

|Zka’| = |Zka| (1+

)

Note 1:

The deviation parameter

Vref is defined as the differences

between the maximum and minimum values obtained over the

full operating ambient temperature range that applies.

The average temperature coefficient of the Reference

input voltage,

Vref , is defined as:

Vref

(

)

ppm

Vref at 25

Vref (

) =

Vref

Ta(Vref at 25 )

Vref can be positive or negative depending on whether

Vref Min. or Vref Max. occurs at the lower ambient temperature.

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