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TL431: Could you tell me about TL431's Ref pin absolute Max?

Pokkun
Genius 4695 points
Part Number: TL431
Other Parts Discussed in Thread: LM431

Hi.

①How much voltage is TL431's Ref pin absolute Max?

②Is that value same for LM431?

Best regards,

Masumi Sekiguchi

  • 0
    TI__Mastermind 19570 points

    Hi Masumi,

    In open loop configuration, the TL431 and LM431 VREF pin should not go above Vk or exceed its absolute current input, Iref. Sometimes that is not possible to guarantee, in which case I would recommend to always use a large resistor such as Rref to limit the Iref to below 1mA. This will cause any voltage above 2.5V at the Vref pin to stay between 2.5V - 2.6V.

    -MZ