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TPA3112D1: Impact of Unconnected Outputs (No Ferrite Bead / No Load)

Conor
Guru 12165 points
Part Number: TPA3112D1

Tool/software:

Hi,

We are currently evaluating a board using the TPA3112D1, but we have mistakenly manufactured the PCB without connecting the output paths (highlighted in blue in the attached schematic) from the OUTP/OUTN pins to the speaker.

Specifically, the ferrite bead + capacitor + speaker network was intended, but the jumper connecting OUTP/OUTN to the filter and speaker is missing, so the amplifier outputs are essentially floating with no load connected.

Could you please advise on the following points?

  1. Is there any risk of damage or malfunction to the TPA3112D1 itself when operating in a no-load or floating-output condition?

  2. Could the speaker be affected (e.g., inrush current) if connected after operation?

  3. Aside from EMI concerns, is this condition safe for general operation?

  4. Is it mandatory to follow the Typical Application with a ferrite + capacitor filter and speaker load?

We appreciate your support and look forward to your guidance.

Best regards,
Conor

  • 0
    TI__Genius 10305 points

    Hey Conor, 

    I strongly advise following the typical mono application schematic for this IC. The behavior of the device if breaking DS guidance is unpredictable and not something that can be supported. You could try air wiring your connection and observing the audio output.

    Regards,

    Ore.