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TPA3251: TPA3251: TPA3251 has a noise during powering up and down

Part Number: TPA3251

There is a pop noise during powering up and down, the waveform as below:

Yellow: Speaker


  • Output SE configuration.
  • Noise happens at all output channels.
  • Increase C-start capacitor with 0.82uF in parallel, there is no improvement and pop noise happens sometimes in powering down.

The schematic as below: