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TPS65982: I wish to test if the Cable with e-marker profile 20V 5A can actually handle 100W

Mitchel Rietdijk
Intellectual 310 points
Part Number: TPS65982

I wish to test if the Cable with e-marker profile 20V 5A can actually handle 100W with 2x TPS65982 EVM modules but testing stops every time at 20V 3A

I Have connected a 150W Dell Power adapter to a TPS65982-EVM with config ID# 7 and connected the USB-C 100W capabe cable to this TPS65982-EVM and the other end connected to the 2nd TPS65982-EVM with Config ID# 6.

Now when I use a dynamic load on this 2nd TPS65982EVM I can load it up to 20V 3A after this point the 2nd TPS65982-EVM turns off (LEDs turn off) when I check the Source capacities using the FTDM I am able to get a max PD profile of 20V 5A so in my opinion I should be able to load this setup accordingly. But at this point it fails everytime at 20V 3A.

Is there an additional step I need to do to get the TPS65982 EVM to switch from the default 20V 3A PD profile to the 20V 5A PD profile?

  • 0
    TI__Mastermind 30000 points

    Hello Mitchell,

    I recommend having your source board configured to config ID 5 and you sink board configured to config ID #7.

    Also where are you connecting the electronic load to? Recommend connecting it to VBUS on the sink board.

  • 0 in reply to Adam Mc Gaffin
    Intellectual 310 points

    Unfortunately it did not solve this issue I changed the Source board to Config ID#5 and still at 20V 3A the Sink board turns off. I have the Electronic load connected to the VBUS on the Sink board.

    Any other suggestions it looks like the negotiated PD profile is automatically set to 20V 3A and I am missing a step to ooverride it to manual 20V 5A

  • 0 in reply to Mitchel Rietdijk
    TI__Mastermind 30000 points

    Do you have a PD analyzer to check the messaging between the two EVM's? The first step either PD controller will do is to communicate to the cable, and check the capabilities of that cable. If the cable is not capable of supporting 5A, it will default down to 3A even though the system can supply the 5A.

  • 0 in reply to Adam Mc Gaffin
    Intellectual 310 points

    When I use the same 2 TPS65982-EVM with the same configuration I connect it to my PCwith the same USB-C cable and I check the supported PD-profiles incl. the cable it mentions it supports 20V 5A. For as far as I know this means the used cable supports 20V 5A but I cannot find any documentation supprting this. According to the information of the manufacturer of the cable it should also support 20V 5A.

  • 0 in reply to Mitchel Rietdijk
    TI__Mastermind 30000 points

    Hi Mitchel,

    With something like this, there could be a number of factors in play. First, there is the communication between the PD controller and cable to see if it is capable of handling 5A. Second, there is the communication between the two PD controller themselves. One saying what it can offer (20V/5A), and the other requesting a contract based on the advertised capabilities. Third, there is the hardware itself on how you are pulling current to try and reach the 5A mark. Without information from the first two, it is difficult to debug the whole issue.

    If you will eventually make your own system integrating a PD controller, strongly recommend getting a PD analyzer to help debug your system. We typically recommend this one.

    https://www.totalphase.com/products/usb-power-delivery-analyzer/