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TPS65982 - Is 5V @ 5A a possible negotiated power setting for PP_EXT?

Jonathan Bender
Expert 7895 points
Other Parts Discussed in Thread: TPS65982

Hello,

Is 5V @ 5A a possible negotiated power setting for PP_EXT with TPS65982?

Looking at the USB PD spec, it would seem that a DFP advertising Profile 5 (capable of supplying at least 5V @ 2.0A, 12V and 20V at 5A respectively) would be able to negotiate a current increase to 5A without a voltage increase. However, I'm not clear whether this is actually possible - looking at Table 2 in the latest EVM User's Guide, a 5V@5A sink is unsupported by any of the built-in EVM profile examples.

Thanks,

Jonathan

  • 0
    TI__Mastermind 30280 points

    No, the Type-C & PD Specs do not allow 5V@5A

    The PD Spec also does not allow 12V@5A.

    To achieve 20V@5A, a special "e-marked" cable is required.

    Otherwise, the TPS65982 will automatically advertise 20V@3A, which is the maximum cable current guaranteed by the Type-C spec. This is a great feature to protect the Source!

    I hope this quick answer helps. Both the Type-C and PD spec are available at usb.org for FREE

    There are other ways in the PD spec to allow >3A of current at 5V for short periods of time, but it will require a longer answer to explain.

  • 0 in reply to Brian Berner
    TI__Expert 7895 points
    Thanks for the quick and detailed reply, Brian. The fact that 5V@5A isn't allowed in any conventional manner is good enough for me (as it would then be unwise to create a sink that would expect off-the-shelf sources to be able to adhere to an exotic implementation).

    Jonathan