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Does TPS2546 prevent back-drive issue ?

user4760726
Intellectual 1195 points
Other Parts Discussed in Thread: TPS2546, TPS2556, TPS25200, TPS2549

Hi Team,

I am just wondering that whether or not TPS2546 can avoid the back-drive issue from external device ? or we need to add another IC to prevent it. Please advised. 

Thanks,

Leroy Song

  • 0
    TI__Mastermind 49960 points

    Hi Leroy,

    The TPS2546 does not have this capability so an external switch (TPS2556 or TPS25200 depending on what you are looking for) would be required.


    We added 'Client mode' to the TPS2549 which allows the system to disconnect the power path but maintain the data connection when an external device is trying to be the host. This device also added cable droop compensation when can help with obtaining MFi.


    Please let me know what you think.

  • 0 in reply to JCHK
    TI__Intellectual 1195 points

    Hi John,

    Thanks for the response. I still have few questions. Firstly, I studied both datasheets a little bit and found out that TPS25200 has the revserve current blocking to prevent the back-drive issue. How does TPS2556 avoid the issue? Also, in what kind of application the system should use efuse as the external IC to prevent the issue? And for what kind of application should the system add limit current switch?

    In addition, the system flow is PCH-> redriver-> TPS2546. Should the external IC that prevents the back-drive issue be placed after TPS2546?   

    Thanks,

    Leroy Song

  • 0 in reply to user4760726
    TI__Intellectual 1195 points

    Follow up the question from previous post, when would backdrive issue occur? is it because two hosts are connecting together (i.e. Y cable)?  Please advised.

    Leroy Song