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TPS61087: Improving transient repose

Kazuki Kuramochi
Genius 9060 points
Part Number: TPS61087
Other Parts Discussed in Thread: TPS61089

Hello Expert,

I have question for TPS61087 and its typical application circuit.
Datasheet's recommended external compensation's time constant is approx. 20kHz.
However, we'd like to expand loop gain at 100kHz.
Then I'd like to know following points.
1. Could this device use as 100kHz external compensation?
2. Could you provide recommended compensation component's coefficients? Or could you provide external components coefficient's which can achieve highest frequency response if TPS61089 cannot support 100kHz?

I'm looking forward to hearing back from you.


Best regards,
Kazuki Kuramochi

  • 0
    TI__Mastermind 34201 points

    Hi Kazuki-san,

    Which device are you talking about, TPS61087 or TPS61089?

    I'd like to know about background of this application so please share application's working specifications, such as Vin range, Vout, Iout, and the reason of expending the loop bandwidth. 

  • 0 in reply to Zack Liu
    TI__Genius 9060 points

    Hi Zack-san,

    Sorry for making your confusion.
    I’ｍ talking about TPS61087.

    For the design information, I'll ask customer about this. But would you tell me why you need these information?
    Also, could you answer my question at first? I guess it is know related with input and output condition don't have large impact for this point.
    We just want to know TPS61087 can improve frequency response again typical application and recommended compensation coefficients.

    Best regards,
    Kazuki Kuramochi

  • 0 in reply to Kazuki Kuramochi
    TI__Mastermind 34201 points

    Hi Kazuki-san,

    The Rcomp, Ccomp values should be designed based on inductor value and Cout, Vout, Vin, Iout values. I can't give you any recommendations without the information of input and output conditions.

    However, we'd like to expand loop gain at 100kHz.

    Do you mean setting the open-loop bode plot bandwidth to 100kHz?

  • 0 in reply to Zack Liu
    TI__Genius 9060 points

    Hi Zack-san,

    Sorry for my late reply.
    Fortunately, I resolved this issue by myself.

    I'd like to close this thread.


    Thank you and best regards,
    Kazuki Kuramochi