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TPS65987D: Evaluating an USB-PD source chipset (USB-PD source controller and matching DC/DC-converter) for up to 20V5A and stand-alone mode

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65987, TPS25751, TPS25751EVM

I'm designing an USB-PD souce for up to 100W (5V/3A, 9V/3A, 15V/3A and 20V/3A always and 20V/5A if cable is e-marked and cable’s capabilities allow 5A). It must work stand-alone, i.e. without external microcontroller and/or firmware development
Does TPS65987D support cable identification by reading out e-markers automatically? What we need is that the chip itself identifies the cables current carrying capability and advertises the suitable power delivery object, i.e. 20V/5A if allowed by the cable or 20V/3A otherwise. And is it also possible to configure a GPIO either to detect an overcurrent event or to control a DC/DC-converters output current limit?

  • Hi Michael,

    Instead of the TPS65987, I would recommend looking at the TPS25751 if you are looking at a USB-C PD for power applications.

    Does TPS65987D support cable identification by reading out e-markers automatically?

    Our TI PD controller family will communicate with the cable to negotiate the correct current and check that it is E-marked appropriately.

    And is it also possible to configure a GPIO either to detect an overcurrent event or to control a DC/DC-converters output current limit?

    With the TPS25751, we can set the Output current limit over I2C when PD contracts are negotiated. With the TPS65987D, we do not have that capability, but there is overcurrent build into the PD controller.

    Thanks and Regards,
    Chris

  • Thank you Chris

    But the TPS25751 datasheet says it is optimized for sink and DRP applications. Is it also suitable for pure power provider (source only) applications?

    And when will the TPS25751EVM be available again?

    Best regards, Michael

  • Hi Michael,

    After checking with the team, the TPS65987DK would be the best fit for your source only application. The TPS25751 can work in source only applications at 5-V, but it does not have some of the protection features that the TPS65987DK has. (Specifically OCP for sourcing).

    And when will the TPS25751EVM be available again?

    In 1-2 months.


    The TPS65987DK is capable of reading cable capabilities and adjusting the USB-C PD negotiation accordingly.

    Thanks and Regards,

    Chris