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TPS546C23: VOUT Register in 2-phase configuration

Sepeedah Zadeh
Intellectual 2850 points
Part Number: TPS546C23

Hello,

I have a question regarding the READ_VOUT command when in a 2-phase configuration. Will the register for the salve device be updated to the VOUT value or not?

Based on the post found here:  I  would think that there may be a possibility that register in the slave device will not update. Please confirm if this is true.

Thanks,

Sepeedah

  • 0
    TI__Intellectual 2850 points
    To expand more on my question, in the data sheet it is recommended to leave the RSN and RSP pins floating for the slave device: "For the loop slave device in a 2-phase configuration, the remote sense amplifier is not required for output voltage sensing or regulation."

    So is there another way that the VOUT register would be updated or this register just doesn't update in slave?
    Also, is it possible to connect the RSN and RSP on the slave so we can update the VOUT register or would that cause a conflict in the system?

    Thanks,
  • 0 in reply to Sepeedah Zadeh
    TI__Prodigy 580 points

    For TPS546C23 configured as slave device,

    • if the remote sensing pins RSP/RSN are not connected to output and DIFFO pin is floating, the input and output of differential amplifier are floating, READ_VOUT issued to slave device may return zero.

    • If the remote sensing pins RSP/RSN are connected to output while DIFFO pin is floating, READ_VOUT issued to slave device would return the actual output voltage.

  • 0 in reply to Sepeedah Zadeh
    TI__Guru**** 191445 points
    I verified on bench.

    For slave device,
    − if the remote sensing pins RSP/RSN are not connected to output and DIFFO pin is floating, then the input and output of differential amplifier are floating, READ_VOUT may return zero.
    − If the remote sensing pins RSP/RSN are connected to output while DIFFO pin is floating, READ_VOUT would return the actual output voltage.
  • 0 in reply to JohnTucker
    TI__Intellectual 2850 points
    Thank you team! I am assuming that connecting the RSP/RSN pins of the slave device to the output will not cause any conflict or issue based on bench results.

    Thanks,
    Sepeedah