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LM4673: pop noise during power off

Sam Ting
Expert 3160 points
Part Number: LM4673

Hi team,

Could you please provide the solution to solve the pop noise during power off? Thanks!

Please find the schematic and waveforms below. We've applied C19 with 1uF to solve the pop noise at power on.

Best regards,

Sam Ting

  • 0
    TI__Guru* 84915 points

    Hi, Sam,

    Our team will take a look at this thread. We will reply as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0
    TI__Guru** 102545 points

    Hi Sam,

    For best pop performance, you the device should be muted until the supply is fully powered up and stable, and it should also be muted before removing the power supply. The sequence would be like below:

    • Hold SHDN pin low
    • Power up VDD/PVDD voltage
    • Pull SHDN up
    • Device is in active mode
    • Pull SHDN low and hold
    • Power down VDD/PVDD voltage
    • Device is powered down

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