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USB-C PD UFP design considerations

user6466152
Prodigy 181 points
Other Parts Discussed in Thread: TPS25750, TPS25750EVM

I am trying to build a circuit with multiple wireless charges that require 5V/1A (5W). I have 5 of those those and some additional peripheral hardware such as a microcontroller and some LEDs. I also want to be able to power up a Raspberry Pi 4 from the same circuit (3A, 5V = 15W).

I need to find a solution to be able to power this circuit which, in theory, requires 40W to operate at max load. I looked around and I discovered that the most prevalent power source nowadays is USB-C enabled transformers that provide up to 20V at 5A (100W). 

I did some reading here, here and here to understand more about USB-C PD system. I also wrote this stackexchange answer for a question with what I understood in order to ground my knowledge.

I do understand that generally any USB-C PD system will be able to offer 5V/3A until it receives a message through the CC line to increase the voltage. However, I am unsure how to choose a package for my device.

I am planning to use a buck-converter to transform the 12/15/20V to 5V to feed my devices.

What is the way forward? Can you link me to some more documentation? Please let me know if I am clear with the requirements.

  • 0
    TI__Mastermind 30000 points

    Hello,

    Apologies for the late reply. It does not seem that my comment yesterday was successfully uploaded. 

    Your request is clear and the device that would work best for you is the TPS25750. This is our latest device and is perfect for scenarios that require only power. The TPS25750 handles all of the PD communication on the CC pins, negotiating a PD contract with a connected charger. Also, if you use the TPS25750D variant, this incorporates both power paths so you do not have to worry about designing external power paths. You can reference the TPS25750EVM on how your potential applicaion would look like. In the TPS25750EVM, it uses a battery charger for sourcing and sinking capabilities, but for your application, your buck converter would replace where the battery charger is.

    Let me know if you have any additional questions 

  • 0 in reply to Adam Mc Gaffin
    Prodigy 181 points

    Thank you so much. This is exactly what I was looking for.