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TUSB320: Cant get 3A at load site

shivani modi
Prodigy 110 points
Part Number: TUSB320

Hello,

We use TUSB320 Part for the Type-C 5V/3A solution. we are using TUSB320 as a DFP . But we cant get 5V/3A at every load. when we change the load as phones , load current gets different. we did all require set up for DFP Solution , so why this is happening. It will be very helpful if you give reply fastly and effiently. becuase so many time i observe that we need diffreent ans and you all give diffrent ans and concluded with that. and 2-3 days waiting but pretty not recieving any feedback, as we need in urgent basis , Please acknowled it perfectly.

Thank you,

shivani

  • 0
    TI__Guru*** 145105 points

    can you share schematic?

  • 0
    TI__Guru 64326 points

    Hi Shivani,

    For Type-C DFP ports can only advertise the provided power level and provide current up to that amount. UFP ports are responsible for consuming the necessary amount of current for the desired function. TUSB320 should only control the Vbus power switch enable pin through the ID pin/function and not influence provided load current. See below quote from the Type-C spec (2.3.4 USB Type-C VBUS Current Detection and Usage):

    USB Type-C Current at either 1.5 A or 3.0 A is primarily intended for charging
    applications. The Sink can vary its current draw up to the advertised limit. Offering
    USB Type-C Current at either 1.5 A or 3.0 A is allowed for a host providing bus power
    to a device. The host needs to assume that the device will continuous ly draw up to
    the offered limit.

    In short not all Type-C loads will consume ~3A when 3A capability is advertised. To ensure that TUSB320 you should measure three things:

    • Vdd is greater than 3.5V
    • CC voltage is in between ~1.31V - 2.04V (VRd-3.0) when a Rd is present (Table 4-36 Voltage on Sink CC pins (Multiple Source Current Advertisements)).
    • ID asserts low when Rd is presented to CC (valid connection is made). 

    Hopefully this clears things up. Let me know if you have any questions. 

  • 0 in reply to Malik Barton57
    Prodigy 110 points

    Hello,

    Thank you Malik,

    Your Ans preety much tough to solve my problem.

    Shivani