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TPS65987D: Can you use both power paths in parallel?

Daniel Baldor
Intellectual 340 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TIDA-050012, , TIDA-050014

Our application is only a sink application (UFP).  Is it possible to tie the two power paths together (ie short the PPHV signals together, short the drains together and short the vbus inputs together) in order to reduce the loss due to the internal RDS on of the fets?

  • 0
    TI__Mastermind 36756 points

    Hi Daniel,

    Currently, this is not supported on the TPS65987D. However, we are in the process of developing a TI-Design and FW to support closing both power paths simultaneously. Our target would be to have the Design complete at the end of September. The design for the Power Sink would be TIDA-050014. The design for the Power source would be TIDA-050012.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Intellectual 340 points
    Hi Eric,
    Can you share the schematic for TIDA-050014?
    Thanks,
    Dan
  • 0 in reply to Daniel Baldor
    TI__Mastermind 36756 points

    Hi Daniel,

    Since this design is not yet available for public release, I cannot yet share the schematic. However, the schematic is very simple as it only includes a Type-C Connector, the TPS65987D, and a SPI-Flash. The only difference is both VBUS 1 and 2 are tied together and PPHV1 and 2 are tied together. You can reference the TPS65987-90EVM for now.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,

    Eric

  • 0 in reply to Eric Beljaars
    Intellectual 340 points

    Hi Eric,

    You mentioned that TI is developing firmware to support the configuration of using both fets in parallel.  Will we be able to load the firmware via I2C to enable the second fet path after boot up?  I was not planning on putting a SPI flash for the TPS65987D.  The ADCIN1 is setup to cause the TPS65987D to boot up in Configuration 3.

    Thanks,

    Dan

  • 0 in reply to Daniel Baldor
    TI__Mastermind 36756 points

    Hi Daniel,

    You will either need an external SPI Flash or a host processor that can push the patch onto the 87D while booting. This is an advanced feature that will not be supported in one of the default ROM configurations.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,

    Eric