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TL431A-Q1: The variation of ΔVREF/ΔVKA in VREF = VKA

Tomoaki Yoshida91
Genius 5255 points

Part Number: TL431A-Q1

Hi team,

I have a question about Electrical Characteristics on datasheet.

We are considering to use VREF direct connection to VKA.

How should I consider the variation of ΔVREF / ΔVKA?

If VKA changed 1V from normal output, what is the final VREF, VKA?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Mastermind 19370 points
    Hi Tomoaki,

    With VREF directly connected to VKA, that specification does not apply. The final output voltage should be 2.495 +/- accuracy. Because of this, VKA = VREF and VKA cannot change 1V from the normal output.

    The variation of ΔVREF / ΔVKA applies only for figure 21. In figure 21, the resistors R1 and R2 are used to raise the voltage of VKA. This causes VKA > VREF and be different from the normal output.

    If you have any more questions, feel free to ask.

    -MZ

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


    If you feel this is resolved, please selected Answered.
  • 0 in reply to Marcoo Z
    Genius 5255 points
    Hi MZ-san,

    Thank you for your support.
    I understood that.

    Best regards,
    Tomoaki Yoshida