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TPS65981: Feeding USB PD controller with 20 V on power up, skipping USB PD negotiation

Newton Cardoso
Intellectual 745 points

Part Number: TPS65981

Hi,

I used TPS65981 in the internal power supply topology of a board, that is connected to an external USB C PD power supply, and I am curious if I could offer a low cost version of the external power supply, using an ordinary 20 V power supply.

This offer would imply the injection of 20V in TPS65981 with no previous PD negotiation. Is it feasible?

Best wishes,

Newton Bomeisel Cardoso

  • 0
    TI__Mastermind 36756 points

    Hi Newton,

    This is not feasible as it would violate the USB PD Specification. The TPS65981 is PD compliant and would not permit this behavior.

    Consider using TIDA-01602 for a low cost 20V power supply to compliant USB PD solution:

    If this answers your question, PLEASE select This resolved my issue

    Thank you,
    Eric