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TPA2016D2: Consistent Low Volume Ticking Noise After Some Time in the Field

Edward Wilkolaski
Prodigy 50 points
Part Number: TPA2016D2

I have a stereo design using the TPA2016D2RTJ Class D Amplifier.

It is a reasonably new product, that drives 2 speakers in stereo.  The design works as expected, but after some time in the field, a low volume 'ticking' noise comes from BOTH speakers.  It is always present and fairly low volume, but quickly becoming a nuisance.  At this point, it is about a 10% exposure in the field.  Product return analysis root caused the ticking to the amplifier itself.  Replacing the amplifier resolves the issue.  To the best of my knowledge, the application notes are being followed.  Any thought or insight is greatly appreciated.

- Source is Stereo, Single Ended from NXP SGTL5000 Stereo Codec

- We have speaker AND headphone output.  Headphone output does NOT go through the TPA2016 and there is NO ticking on the headphone lines, so source of ticking manifests in the TPA2016.

- Initialization of TPA2016 happens at startup and the AMP is ALWAYS on.  I2C simply controls gain registers.

Thanks and look forward to any insight!

  • 0
    TI__Guru* 84915 points

    Hi, Edward,

    Could you provide the entire circuit schematic, please? Have you seen noise issues in any other part of the circuit besides the speaker outputs?

    Have you tested a bad unit on a new board and see if the problem persists? If so, have you contacted your local sales offices for failure analysis?

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 50 points

    Sure thing...see below.

    No other noise issues that I am aware of.  The problem follows the part and part replacement fixes the 'bad' PCB.  On a 'bad' TPA2016, ALL intentional audio is still present, but there is a consistent ticking that is always present.  It is not extremely loud, but ALWAYS present.  Typically after 6 to 8 months in the field.  

    Environmental conditions are a consistent room temperature.

    Thanks,

    Ed

  • 0 in reply to Edward Wilkolaski
    TI__Guru* 84915 points

    Hi, Edward,

    Unfortunately, I didn't find anything in the schematic that could be related to this issue.

    Do you have some components exposed to the absolute maximum ratings? Or some tolerances that could surpass the limits?

    Could you contact your local sales office to ask for a analysis failure with the reported units? In that way, we could be able to identify the root cause.

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.