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Original question:

TPS65982: Q2 MOSFET Burnout issue

TPS65982: Negotiate 5V PDO from PP_EXT OCP issue

Picher Lu
Prodigy 160 points
Part Number: TPS65982

Hi, Team

When I test OCP function of TPS65982, I found some problem about 5V negotiate from PP_EXT. Below shows the OCP waveform capture.

When over current occur, would shut down PP_VBUS and try to return normal, and PP_VBUS last about 150mS, I think it's not in good protect state, what should be the correct state? 

  • 0
    TI__Mastermind 29995 points
    Hello,

    Using the configuration tool, you can change the external power path over current timeout within register 0x28 and bits 46:49. You can also peak current capabilities to be sinked for each PDO.
  • 0 in reply to Adam Mc Gaffin
    Prodigy 160 points

    Exactly, I set the over current timeout as default showed as below

    "You can also peak current capabilities to be sinked for each PDO."

    I don't get this point, I have set peak current as 150%, and I don't this this will cause over current retry last time.

  • 0 in reply to Picher Lu
    TI__Mastermind 29995 points

    Hello Picher,

    Then the timeout should be the 640us that you have it set to. The typical characteristics for over current situations are shown in sections 9.3.3.4 and 9.3.3.9 of the datasheet.

  • 0 in reply to Adam Mc Gaffin
    Prodigy 160 points

    Hi, Adam

    Thanks for your reply.

    Exactly, when 5V negotiate from PP_5V0, 9V/12V/15V/20V negotiate form PP_EXT, the OCP characteristics can meet the spec, But 5V negotiate from PP_EXT alway have a waveform like above, at retry process the voltage last too long.