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TPS43060: 50V from 28V nominal

David C
Expert 3350 points
Part Number: TPS43060

I am reviewing a design that uses TPS43060 to create 50V from 28V nominal (24 to 32V) with a max output current of ~7A.  When I input these parameters into Webench, I don't see TPS43060 as an option.  I am concerned that the TPS43060 doesn't support a high enough voltage for this application. Is this correct?

  • 0
    TI__Expert 7450 points

    Hi David,

    The voltage should be okay. The input is up to 38V and output max 58V. It may be the power.

    Have you tried using a lower load in the Webench?

    Thanks,

    Yinsong

  • 0 in reply to Yinsong Cai1
    TI__Expert 3350 points

    I am concerned with the voltage rating of SW, BOOT, and HDRV pins.  SW has an absolute maximum voltage rating of 60V (58V recommended) and BOOT and HDRV have an absolute max rating of 65V.  With a gate drive voltage of 7.5V, that means the absolute max for the switch node needs to be limited to less than 57.5V.  With an output voltage of 50V, this doesn't leave much head room to allow for ringing and forward drop across the synchronous FET on the switch node.  I suspect that ringing on the switch node would occasionally damage the PWM.

  • 0 in reply to David C
    TI__Expert 7450 points

    Hi David,

    I see your point. It should be okay from our experience. The customer can add a snubber and gate resistors to ensure that the SW pin voltage doesn’t overshoot.

    Please let me know if you have any questions.

    Thanks,

    Yinsong