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TPS568230: The Acp and Ts of TPS568230

Charlie Xiao
Expert 7825 points
Part Number: TPS568230


Hi Team,

In the Application Report, I don't know where the value of Acp and ωRI  come from. Can you give me a hint? Thanks.

Regards,

Charlie

  • +1
    TI__Expert 5470 points

    Hi Charlie,

    Acp is a gain of internal compensation. wRI is the angular frequency of internal compensated zero.

    D-CAP3 is with integrated compensation. Those values are normally fixed after you select a switching frequency for a D-CAP3 converter.

    I don't know if you have read the part I app note SLVAF11. It has more detailed introduction about the internal compensation.

    Thanks,

    Andrew

  • 0 in reply to Andrew Xiong
    TI__Expert 7825 points

    Hi Andrew,

    Thanks for your quick reply. Yes, I have read the app note SLVAF11.

    A ripple generation circuit is integrated. Will the datasheet give the resistance and capacitance of the ripple generating circuit, or directly give the location of the zero point?
    I searched the datasheet again, but I still didn't find the value of Acp and ωRI .And I only found explanations about compensating the zero point. Did I miss it when looking at the datasheet? Thanks.

    Regards,

    Charlie

  • +1 in reply to Charlie Xiao
    TI__Expert 5470 points

    Hi Charlie,

    The internal compensation circuit is confidential.

    Compensated zero is given in some datasheet.

    A more common method now is to directly give recommended bom range including L, C and feedforward cap in datasheet to ensure converter stability. Customer could use our part easily following the recommendation.

    Thanks,

    Andrew

  • 0 in reply to Andrew Xiong
    TI__Expert 7825 points

    Hi Andrew,

    Thanks for your support.

    Regards,

    Charlie