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TPS51020: and TPS54317 Control loop

Michael T Schneider
Expert 3780 points
Part Number: TPS51020

Team,

We need to replace an obsolete output cap that is used with these devices.  The new cap has an ESR that is half that of the original. Better for ripple but I want to check to see if it has a substantial effect on the control loop. 


Can you share the control loop calculations for this part?

  • 0
    TI__Mastermind 19080 points
    Hi Michael,

    It's an voltage mode device. Output cap with smaller ESR may have some negative impact on the loop. Could you send me your original schematic and the part numbers of old and new output cap?
    We don't have calculation tools for this part, but I can help to evaluate the stability.
    Thanks!

    Regards,
    Hao