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TPS65983B: Dynamic power test about TPS65983B by using TPS6598xEVM

Gary Teng
Genius 5860 points
Part Number: TPS65983B
Other Parts Discussed in Thread: TPS65982

Hi all,

 My customer design 983B with AR in their TBT docking application. They need to test dynamic power function in their factory by using TPS65982(or 3) EVM. I can test 5V and 20V by using  983B FW.v1.36 with Autonegotiate sink setting, but can't connect correctly in 9V or 15V setting. Can I know how to test dynamic power function on PD power source correctly? Thanks for your kindly help.

Best regards,

Gary Teng

  • 0
    TI__Mastermind 36756 points

    Hi Gary,

    The Alping Ridge TBT hardware is very different from the 83BEVM. The EVM is not setup to test those features. You would need to test the dynamic power function on the Alpine Ridge hardware for it to function correctly.

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

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Genius 5860 points
    Hi Eric,
    For factory PDO test (for example 5V/9V/15V/20V), would you please helping to suggest how to test those PDOs on a power source with dynamic power function?

    Gary
  • 0 in reply to Gary Teng
    TI__Mastermind 36756 points

    Hi Gary,

    If you have a PD Analyzer like the Teledyne Lecroy or the Totalphase PD Analyzer you can check the PD communication to make sure you are correctly negotiating the proper PD voltages.

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

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Genius 5860 points

    Hi Eric,

    I use 982 GUI (v3.11) to build sink FW and put it on 982 EVM to connect with TBT board (FW v4.45) with dynamic power function. It can work on 5V/15V/20V but failed on 9V. Would you please helping to check what's wrong in communication?

     And, I've tried 983's GUI (v3.16) to build bus power sink device, but it can't support dynamic power function (maybe something wrong in my setting in autonegotiate sink?

    Best regards,

    Gary7380.dynamicpowertest.zip

  • 0 in reply to Gary Teng
    TI__Mastermind 36756 points
    Hi Gary,

    Please use a PD analyzer to investigate why it is "failing" at 9V. Do you have a 9V rail on your PCB to support the 9V PDO?

    Thank you,
    Eric
  • 0 in reply to Eric Beljaars
    Genius 5860 points
    Hi Eric,
    Please check the link below about test result of 9V/15V. There're log(lecroy), pjt and bin.
    e2e.ti.com/.../dynamicpowertest.zip

    I see TBT's dock side reject 9V's connection. Maybe I'll modify sink's PDO as 9V1A to ignore dynamic power function and confirm 9V power supply?

    Gary
  • 0 in reply to Gary Teng
    TI__Mastermind 36756 points

    Hi Gary,

    From the logs, the issue is fairly clear. The PD Negotiation all looks okay. However, the Source never sends the PS_Ready message. This is because your Source voltage never reaches 9V. I suggest you monitor the voltage of VBUS and PPHV during this event to observe this. You would need to fix this issue with your DC/DC supply to make sure your board can supply the correct voltage.

    PLEASE select  This resolved my issue

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Genius 5860 points

    Hi Eric,

    1. Source side is intel's TBT AR reference design board.

    2. Please check the voltage in fig. You can see there's 9V shown on Vbus, but it's gone soon and retry to connect.

    3. Comparing log about 9V and 15V, there's no "power source ready" command sent from source side. Do you think 10.4V is not acceptable for 9V PDO?

    Gary