KIA431AS datasheet(4/8 Pages) KEC

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2012. 3. 20

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KIA431 Series

Revision No : 16

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 :

ΔVref = 8.0mV and slope is positive,

Vref at 25℃=2.495V, ΔTa=70℃

0.008

×106

αVref =

= 45.8 ppm/

℃

×(2.495)

Note 2: The dynamic impedance Zka is defined as:

ΔVKA

|Zka| =

ΔIk

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

ΔVref 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,

ΔVref , is defined as:

ΔVref

(

)

× 106

ppm

Vref at 25℃

αVref (

) =

℃ΔTa

ΔVref × 106

ΔTa(Vref at 25℃)

αVref can be positive or negative depending on whether

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

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