• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 78 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS65988: Sink FET recommendation

Yashodha Salgado
Prodigy 100 points
Part Number: TPS65988
Other Parts Discussed in Thread: CSD87501L, TPS65994

Hi,

I'm designing my own PCB for TPS65988. I want to replace the following circuit block with just one CSD87501L transistor (the same as TPS65994EVM does). 

I just want to know if is there any issue with my new configuration.? Will it work well?

Thanks

  • 0
    TI__Expert 6855 points

    Hi Yashodha, 

    The TPS65988 does not have gate driver signal outputs like the TPS65994. The GPIO 3.3V outputs from the TPS65988 to control the external switch will not be able to drive the CSD87501L N-FET. The gate driver outputs from TPS65994 are high voltage signals that are required to control the external FET. You would need to use an external gate driver with the CSD87501L N-FET for TPS65988.

    Since the TPS65988 has integrated internal high voltage source/sink power paths, I recommend using those. These require no additional external path and are 20V 5A rated for source and sink.

    Best,

    Alex

  • 0 in reply to Alex Liu
    Prodigy 100 points

    Hi, 
    Thanks for the information. I'll do so.

    Btw,  how to use the internal power path for sinking. I was unable to find a proper application note for that, could you please recommend an application note or sample schematic, please?

    Thanks

  • +1 in reply to Yashodha Salgado
    TI__Expert 6855 points

    Hi,

    The internal power path is fully integrated in the PD controller. You only need two connections, PP_HV1/2 on the system side, and VBUS on the connector side. The PD will manage this path based on the loaded configuration. For schematics, please see the attached EVM schematic for TPS65988.

    PSIL091A(001)_Sch.PDF

    I will be out of office next week for Thanksgiving holiday. Please expect a delayed response to additional queries.

    Best,

    Alex