• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 179 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65987DDK: Can the TPS65987 support external source output via PD power?

Bruce Dai
Intellectual 620 points
Part Number: TPS65987DDK
Other Parts Discussed in Thread: TPS65987, , TPS65988DK, TPS65988

Tool/software:

Hi AE,

        We are planning to design a related circuit and would like to ask if the TPS65987 can support external source power supply?

        Additionally, if it is supported, could you provide relevant circuit diagrams and firmware settings for reference?

Best Regards

  • 0
    TI__Mastermind 37855 points

    Hi Bruce,

    Bruce Dai said:
     We are planning to design a related circuit and would like to ask if the TPS65987 can support external source power supply?

    What do you mean by "can support external source power supply"?

    Are you asking if the TPS65987 can act as a USB-C PD power source? Or if it can sink power from an external power supply?

    Please add some clarification regarding this.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Intellectual 620 points

    Hi Chris,

              Yes, I need to know how to setting the USBPD power as source via external mosfet. ( VAR_DCDC to source )

              I believe it can be achieved because the EVM has reserved this design, but it is not being used.

              Additionally, I would like to know how to control the external MOSFET and disable the internal MOSFET when the PD is source status, Is there any documentation available for this part?

              

    Best Regards

  • 0 in reply to Bruce Dai
    TI__Mastermind 37855 points

    Bruce,

    Why do you need an external power path with the TPS65987DDK? It should have two internal high voltage power paths, one can be used for sinking, one for sourcing.

    Is this for the TPS65988DK?

    PJT Settings:

    I would recommend using the 988DK DRP default pjt as a guide/template:

    1st you need to configure the powerpaths to support the desire power role in Global System Config(0x27). PP1 and 2 are the internal power paths on TPS65988, PP3 and 4 and are the external power paths.

    Then, you need to configure the desired PDO in Transmit Source PDO(0x32) to have the desired Switch Source. Each Source PDO needs to be configured.

    HW:

    You primarily need the external power path. See the datasheet and attached app note for supported protection. Any other protection, (things like RCP and OCP) need to be provided by you external circuit design.

    The 988EVM provides and example of the external Sink power path. We do not have a 988EVM that uses the external path for sourcing.

    slva994.pdf

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Intellectual 620 points

    Hi AE,

           Thanks for your answer! I have some questions I'd like to ask.

           1. What is the function of the red box? Is it necessary to add it?

           

            2.  About the FW setting, the GPIO#16 should be set as this function, Right?

               

            3.  Besides these settings, is there anything FW setting else that needs to be noted?

    Best Regards

  • 0 in reply to Bruce Dai
    TI__Mastermind 37855 points

    Hi Bruce,

    Bruce Dai said:
    . What is the function of the red box? Is it necessary to add it?

    If that is from the TPS65988EVM, it is a discrete RCP circuit for a dedicated external sinking path. If you look closely, if the PPEXT1 node has a greater voltage than the node between the FETS, it will drive the output high and enalbe Q6. This will disable the output of the FETS and disable the power path.

    Bruce Dai said:
    2.  About the FW setting, the GPIO#16 should be set as this function, Right?

    Yes

    Bruce Dai said:
    3.  Besides these settings, is there anything FW setting else that needs to be noted?

    Make sure you configure global system configuration correctly, specifically the power path roles. Also, make sure you set the Power paths in Transmit Source Capabilities to the desired power path for each PDO.

    Thanks and Regards,

    Chris