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TPS5402: maximum output voltage with 14.5Vin

Intellectual 2095 points
Kevin Wen

Replies: 4

Views: 222

Part Number: TPS5402

Hi team,

My customer is using TPS5402 in their design, they wish to know if TPS5402 could stable work at 14.5Vin, 12.4Vout, 1A output current, would you please show your suggestion? thanks. 

Kevin

Intellectual 2095 points
Kevin Wen
  • Intellectual 2095 points
    Kevin Wen
    Hi team,

    one more thing, if 12.4V is too high, what is the maximum output voltage with 14.5VIn?

    Kevin
  • Genius 10070 points
    Shawn Nie

    In reply to Kevin Wen:

    Hi,

    It is influenced by Rdson, DCR, resistance of PCB, min off time. I will check it on bench and give the feedback to you.

    Shawn
  • Intellectual 2095 points
    Kevin Wen

    In reply to Shawn Nie:

    Hi Shawn,

    thanks for your support and would you please suggest if you can finish the test today? customer is pushing us for feedback, thanks.

    Kevin

  • Genius 10070 points
    Shawn Nie

    In reply to Kevin Wen:

    Hi Kevin,

    In theory, it is feasible.

    Vout_max = [Vin - Iout*Rdson_hs + 0.7]*Dmax - Iout*RL - 0.7, the Dmax is 93%, the max Rdson_hs is 240mohm. If RL is 100mohm and the resistance of PCB is ignored, the Vout_max can be calculated to be 13.1V.

    Sorry, I can't give the bench data to you today. Because TPS5402 is an old device, we have no samples on hand, it will take some time to get the sample.

    Shawn

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