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TPS65981-Short circuit protect

user1874945
Intellectual 300 points
Other Parts Discussed in Thread: TPS65981, LM25066, TPS2480

Hi TI expert,

May I ask if TPS65981 can protect the MOSFET when short circuit happen in the output side?

Thanks，

Dora

  • 0
    TI__Mastermind 36756 points

    Hi Dora,

    Yes, the TPS65981 has over current protection and short protection on all of the power paths. The over current protection is configurable through the TPS6598x Application Customization Tool.

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

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Intellectual 300 points
    Hi Eric,

    Do you have some test waveform to show the response time of the controller TPS65981 during short circuit test? Because the MOSFET is back-to-back, and it may sink current or source current, so can the controller protect both of the MOSFET when short different point?

    Thanks,
    Dora
  • 0 in reply to user1874945
    TI__Mastermind 36756 points

    Hi Dora,

    The TPS65981 only does short and current protection when it is acting as a Source. Per the PD Spec, only the Power Source needs to provide protection. There is not protection on the FETs with TPS65981 when it is acting as a Sink as it is expected that the Source device will have the required protection.

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

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Intellectual 300 points
    Hi Eric,

    That makes sense. Thanks for the detail explanation.
    For short circuit protection, is it similar as the hot-swap controller like LM25066 or TPS2480? How about the response speed? couple us? Is there test waveform for this? Do you have power limit function?

    Thanks,
    Dora
  • 0 in reply to user1874945
    TI__Mastermind 36756 points

    Hi Dora,

    Section 9.3.3.4 through 9.3.3.15 highlight the different over-current and Hard Short protections on all of the TPS65981 power paths. There are also plots showing the response time in those sections.

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

    Thank you,
    Eric