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TPS63027: sunbber circuit

KIM Andy
Expert 2530 points
Part Number: TPS63027
Hi.
My customer wants to add a snubber circuit for the TPS63027.
Can you tell me the location of the snubber circuit to improve the Vds peak of the buck boost circuit?
  • 0
    TI__Guru 61175 points

    Hello Andy,

    Normally with a good layout, it should not be necessary to add snubber circuitry, but if the customer wants to add one, please add it like in a buck converter on L1 and a boost converter on L2.

    Please first review the layout for making sure that the high Vds peaks are not caused by a layout problem.

  • 0
    TI__Expert 7925 points
    Hi Andy,

    Is there any update from your customer?

    As Brigitte mentioned, make sure that the PCB layout follows the datasheet recommendations. If you still see large peaks on switching nodes, it could be that the measurements were not properly done, for example using oscilloscope probes with long GND leads. See this app note for proper measurement of the switch node voltages:
    www.ti.com/.../slva494a.pdf

    Best regards,
    Milos
  • 0
    TI__Expert 7925 points
    Hi Andy,

    We haven’t heard back so we're assuming this resolves your issue. If not, just post a reply below, or create a new thread if the thread has locked due to time-out.

    Thanks and regards,
    Milos