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TPS65986EVM: 9V USB Type-C PD Source with USB 2.0 UFP

Patrick Lloyd
Prodigy 10 points
Part Number: TPS65986EVM
Other Parts Discussed in Thread: TPS25740A

I'm designing a USB type-C device for a customer that connects to an Android phone. The solution needs to charge the phone as well as appear to the phone as a USB 2.0 device (USB-serial converter). The phone only supports charging at 5V, 2A and 9V, 2A. I'm new to USB type-C but as far as I understand it, this can be accomplished by selecting a CC and PD controller that can send the PR_Swap or DR_Swap commands to negotiate this behavior. 

I have a TPS65986EMV evaluation board that I've been testing out but the challenge I'm running into is the fact that the high voltage mode on the eval module doesn't work with any voltage lower than 12V. My question is this: is it possible to do what I need to do with a single chip, or do I need to implement a 9V source with something like a TPS25740A and a hub, like the TIDA-00630 reference design (without the DisplayPort features)?

  • 0
    TI__Expert 6430 points
    Hi Patrick,

    The reason the EVM doesn't work for the 9V contract is that the Buck regulator on the 86EVM is configured for 12V and there's no 9V source for the PD controller. If you can provide a 9V source and can do minor changes in the configuration then you'll be able to support 9V PDO as well.

    You just need to additionally add a USB chip to implement a USB device. PR_Swap and DR_Swap commands are used for USB PD only, they have no relevance for USB communication.

    Thanks,
    Rahul