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TPS54231 application design

Hidekazu Someno
Expert 5130 points
Other Parts Discussed in Thread: TPS54231

When I try to create a TPS54231 application, an application  with errors about phase & gain margin is displayed.

The conditions are; VIN=4.75V-5.25V, Vo=3.3V, Io=2A

  • TI__Mastermind 26205 points

    Hey menodekazu,

     

    Sorry for taking long time to reply.... we are taking care of your question and soon you will get our feedback.

     

    Please keep posting your issues, they help us a lot.

     

    regards

    rogerio

  • TI__Intellectual 2710 points

    Hello,

    You are right that SwitcherPro is giving errors for TPS54231 design with the inputs you specified. The loow phase margin error is mainly because of the poor output cap selection. We understand that our output cap selection algorithm needs to improve and we are working on that. The low gain marging is because of inaccurate compensation. We are working on that, too.

    For a workaround, you can change your output caps to ceramic cap, probably in qty more than one. This will improve your phase margin.

    To improve gain margin for your specific design, i will ask an applications engineer to suggest changes in your design.

    Sorry for the inconvinience.

    Thanks,
    Hetal.