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Original question:

MC33063A-Q1: Reverse polarity protection using P-MOSFET

MC33063A-Q1: Reverse polarity protection circuit - TVS location

Kostyantyn Koziy1
Prodigy 60 points
Part Number: MC33063A-Q1

Is it suggested to put bi-dir TVS before reverse polarity protection PFET or after? (between DG or SG ?)

  • 0
    TI__Guru* 78060 points

    Hi Kostyantyn,

    My understanding is it should be placed after the protection FET.  It is TVS can still conduct if the negative voltage exceeds the TVS protection voltage.  After the FET would block the conduction path.

    Hope this clarifies.

    Thanks,

    Youhao Xi, Applications Engineering