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TAS5630PHD2EVM SD indicator on all the time.

Robert Correllus
Prodigy 40 points
Other Parts Discussed in Thread: TAS5630B, TAS5630

It seems that I cycled the EVM input power with an Audio signal generator still connected and turned on.

 I think this is the source of my problem.  Is there a suggested protection circuit to prevent this issue?

  • 0
    TI__Mastermind 37045 points

    Hi Robert,

     

    TAS5630B has a defined startup sequence, and if this is violated by applying an audio input before the device goes READY (READY pin high) the result can be catastrophic. The following startup sequence needs to be followed:

    1) Connect the audio source to the inputs with the audio source stopped or turned off.

    2) Apply VDD, GVDD and PVDD.

    3) Release /RESET.

    4) Apply audio to the inputs when READY is high.

    Bullet (3) does not include plugging in an input, because this can introduce transients that can drive TAS5630 inputs outside the Absolute Maximum range.  Instead, stop the audio source and restart it when READY is high.

    Best regards,

    Paul Chen

    Audio Apps