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LM4876: Pop noise when shut-down

Kuramochi Tadahiko
Guru 28715 points
Part Number: LM4876

Hi,

My customer is in trouble by pop noise when shutdown(ON→OFF).

What should they change external components from following circuit to improve pop noise?

Best Regards,

Kuramochi

  • 0
    TI__Guru** 100525 points

    Hi Kuramochi-san,

    You could first try to short the input (at the input of the capacitor) to GND and toggle ON/OFF.
    Also check with a scope the signals at the input, output and bypass to identify where the mismatches could be. Some components that could be adjusted for pop reduction would be input and feedback resistors and capacitors, as well as bypass capacitor.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators