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TAS2120: Boost feature to power auxiliary devices??

Chris Dilliway
Prodigy 92 points
Part Number: TAS2120


Is it possible (or advisable) to utilise the internal boost feature to power other devices.  For example, as an audible alarm, we may want to sent short radio messages and operate illumination.  While this could be achieved with a separate boost converter, there are obvious advantages to using the TAS2120 feature.

  • 0
    TI__Mastermind 19760 points

    Hi Chris,

    We don't typically recommend connecting external loads to the PVDD interal boost output since this wouldn't be considered operating within recommended conditions, however if you're connecting it to a circuit with low current draw it could work.

    I would proceed at your own risk since these devices aren't validated with any external loading on the PVDD internal boost output. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 92 points

    OK.  

    I am look for maybe 1W of power from PVDD.  Is that low?

    Are the risks primarily loss of sound quality due to load spikes on the supply for example or unexpected dropout or instability of PVDD itself?

    Anyway, accepted that it's at our own risk.

  • +1 in reply to Chris Dilliway
    TI__Mastermind 19760 points

    Hi Chris,

    Load spikes on the supply or instability of the PVDD regulator could both be a potential risk. Since the PVDD supplies current to drive the class D outputs, there could be issues with the output amplitude/distortion. I would suggest testing on an EVM to see how it affects audio playback. 

    Regards,

    Sebastian