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TAS6684-Q1: What shall power IC do in Water Wading Mode

Hao Chen
Intellectual 665 points
Part Number: TAS6684-Q1


Hello TI Power IC experts,

Our customer has "Water Wading Mode" requirement (When the speaker is at risk of getting wet, we need to turn off the output). 

  • Is it safe to run diagnosis when power IC is in "Water Wading Mode" (There is high short load risk due to wet pins)? Will diagnosis itself harm the power IC?
  • Is it recommended to disable automatic DC or not?
  • On the other side, can we simply do nothing (keep power IC in play mode), just let the power IC chip to cover the risk?

Thanks.

BR

  • 0
    TI__Guru 53260 points

    Hi

    Hao Chen said:
    Is it safe to run diagnosis when power IC is in "Water Wading Mode" (There is high short load risk due to wet pins)? Will diagnosis itself harm the power IC?

    If just the speaker get wet, it similar with short load, could do load diag.

    Hao Chen said:
    Is it recommended to disable automatic DC or not?

    No.

    Hao Chen said:
    On the other side, can we simply do nothing (keep power IC in play mode), just let the power IC chip to cover the risk?

    Will trigger OC protection if IC in PLAY. After that, don't go PLAY again until the DC load diag passed.

  • 0 in reply to Shadow He
    Intellectual 665 points

    Hi Shadow,

    Shadow He said:
    Will trigger OC protection if IC in PLAY. After that, don't go PLAY again until the DC load diag passed.

    Do you mean we can simply reply on the IC Over-current protection instead of putting IC into Hi-Z mode?

    Do you see any risk if we do not put IC into Hi-Z mode during "Water Wading Mode".

    One more question, is the following understanding correct regarding to "automatic DC load diagnostics during Hi-Z or PLAY"?

    - If we put IC in Hi-Z mode during "Water Wading Mode", there will be no possibility to trigger automatic DC due to over-current. Only over-temperature may trigger automatic DC.

    - If we do not put IC in Hi-Z mode during "Water Wading Mode", there will be possibility to trigger automatic DC due to over-current caused by wet connection. 

    Thanks.

    BR