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Accuracy in Rs and Rea of TPS54620

masami
Intellectual 525 points
Other Parts Discussed in Thread: TPS54620

Dear, All

It will be necessary to raise specification top load response speed with a customer's equipment.
It is necessary to adjust the compensated circuit of error amplifier and to gather speed of response.
Therefore, in order to grasp a risk and to estimate a detailed Gain margin, it is necessary to get to know accuracy.
I would like to know the following information about TPS54620.
- Accuracy in Rs (the time of change of temperature is included)
- Accuracy in Rea
Moreover, I would like to estimate the risk of a subharmonic, because its voltage setting range is wide.
Doesn't it oscillate at more than Duty ratio 50%?
Please let me know a slope compensation value.

Thanks, Masami M.

 

  • 0
    TI__Guru**** 191445 points

    I do not see any reference to "Rs" or "Rea" in the datasheet.  Can you be more specific about the parameters you are interested in?  TPS54620 does use slope compensation to to prevent the subharmonic oscillation.  To model the loop response, I recommend using the pspice average model:

    http://www.ti.com/litv/zip/slim303

  • 0 in reply to JohnTucker
    Intellectual 525 points

    Hi,John.

    Thank you for your reply.

    I know what does not have the statement of Rs in a data sheet.
    This value is understood to be '1/GMps'.
    I'm sorry.'Rea' is TYPO of 'Roea'.
    As for 'Roea', the Typ. value appears in P18 of the data sheet.
    Please let me know the accuracy range.
    The About the pspice average model. customer has said that the characteristic differs from a data sheet and pspice model and the system about 'Buck Power Stage Transfer Characteristic'.
    For this reason, a customer may use pspice model or has a question.
    May I answer that there is no problem to a customer about a simulation by pspice model?

    Thanks, Masami M.

  • 0 in reply to masami
    TI__Guru**** 191445 points

    i doubt that we have any range data for those two parameters.  I think they are defined as typical only.  I use the pspice average models often and recommend them.  Pspice is my preferred method for compensation design.