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TLV62585：C3 capacitance

Eva Lai
Prodigy 50 points
Part Number: TLV62585

Hi all,

我們使用  We use TLV62585 for 3.3V 轉  convert to 1.8V應用 application.

SPEC建議值  recommend value of C3是  is 22PF，想請問是否可以使用   I'd like to ask if it can be 18PF?

謝謝  Thank you

  • 0
    TI__Genius 15340 points

    Hello Eva,

    Thank you for using E2E,

    Eva Lai said:
    SPEC建議值  recommend value of C3是  is 22PF，想請問是否可以使用   I'd like to ask if it can be 18PF?

    To improve the load transient response, a 22pF is good for 1.8V output application, but you can also use 18pF. It should not be a problem.

    Thank you & regards,

    Moheddin.

  • 0 in reply to Moheddin Pasha Shaik
    Prodigy 50 points

    Hi Moheddin,

    If we utilize the TLV62585 for a 5V to 0.9V conversion application with a load ranging from 0.9A to 1.2A, I would like to inquire whether C3 can be set to 18pF. Alternatively, is there a recommended value for C3?

    Thank you

  • 0 in reply to Eva Lai
    TI__Genius 15340 points

    Hello Eva,

    The feedforward (Cff) will affect the step load performance. A higher Cff will result to lower overshoot/undershoot, but extended the recovery time. And to calculate for the Cff, please refer to the formula below.

      t = Cff * (RFB_down)

      t: 2200ns

      Cff: feedforward capacitor