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TPS63020: Enable

xiao zhu25
Prodigy 170 points
Part Number: TPS63020

Dear  All:

     I used the tps63020 to design buck-boost circuit. I use the MCU to control the EN pin. but when i reset the mcu, and to configuration the GPIO register until   2 second  after the  MCU reset .

    TPS63020  can't output, it looks like broken. what cause the problem? can you help solve this issue?

              

  • 0
    TI__Expert 8420 points
    HI Xiao,

    Could you be more precise in "can't output "? are the switches broken.. or what does it mean exactly?
    there are chances that the device saw a high current or voltage during the reset of MCU leading to the device to get damages.

    Could you capture the inductor current , input voltage and enable voltage during reset?
    could you also share the layout?
  • 0 in reply to Sabrina
    Prodigy 170 points
    Dear Sabrina:

    Thanks for your reply, i think the switches broken,

    if I configuration the GPIO register after the mcu reset instead of until 2 seconds after the MCU reset , the TPS63020 isn't broken.

    the enable PIN voltage is always low during the MCU reset， and there is no load at present.
  • 0 in reply to xiao zhu25
    TI__Expert 8420 points
    Hi Xiao,

    I need more information to help debug further. I need to see how the layout looks like.

    I also need to understand how the different signals behave during reset. It looks like something happens during reset, probably causing a high voltage or current causing the switches to damage.
    Could you capture the inductor current , input voltage and enable voltage during reset?