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TPS25740B: Using USB as the power sourcec

John Piccoli
Prodigy 60 points
Part Number: TPS25740B
Other Parts Discussed in Thread: TPS65982, TPS65981

Hello,  

I'm designing a charging station for a customer. My customer would like use an off the shelf USB Type C wall charger as the power source. The sink would be charging contacts. 

I believe the TPS25740B would be suitable for this design except all the reference designs have the USB Type C connected as the sink and the power source is AC/DC or  nondescript power supply. Do you have any reference designs with USB as the source? 

Thanks

John

  • 0
    TI__Mastermind 28830 points

    Hey John,

    Thanks for posting your question on E2E. The TPS25740B can only be used in applications where it is a source, and can not be a sink device.

    However, the TPS65981, TPS65982, and the TPS65986 are all DRP's so they have the capabilities of being either a source or a sink. Each of these have their own reference designs that will suit your needs. We currently do not have any parts that act only as a sink device . We may have a sink only device released by the end of Q4, but I would not hold off for that and use one of the three listed parts above.

    If this answered your question, please click This resolved my issue.

  • 0 in reply to Adam Mc Gaffin
    Prodigy 60 points

    Hey Adam, 

    Thank you for the reply. Just to be clear, I would be using the TPS25740B as a source. In my application, the source (nominally an AC/DC) would be my USB port. But I would only be using the power. I would not connect the CC pins to the corresponding CC pins on the TPS25740B. I would have to tie the CC pins to fake a sink. Similarly, the sink (nominally the USB port) would be a dumb 2 port connection containing power and ground. I would also have to fake the CC pin connection on the TPS25740B to simulate a sink. But I'm starting to think that in this configuration, i'm using the TPS25740B as a glorified current limiter. I think what I really need to do is figure out how the CC protocol works to negotiate power levels.

    I did briefly look at the TPS6598x series but since I was not using data, I thought it would be overkill for my application. however, it seems like I need a DRP so I will have another look. 

    Thank you for letting me know about future devices that will behave as sinks. You are right that I cannot wait for that device but i'm glad to know that solution for this application is in the works. 

    John