TPA6304-Q1: 【TPA6304】The voltage of TPA6304 is about 18v, which leads to output oscillation.

This problem occurred when TPA6304 was de-mute at a voltage of about 18v . Changing the inductance and capacitance of the power supply input will affect the probability of oscillation, and TPA6304Q1EVM will also have the same problem when changing C4 capacitance or L9 inductance.

When the output oscillates abnormally, it is easy to damage the device when the protection function of the output fails. I want to know the reason of this problem.

Taylor：

Hi,

What's the waveform? power or AMP output? What's the audio input frequency and output power?

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Bias liu：

Hi

The waveform above is the output waveform. At this time, the cpu has just started working and has not loaded the audio source, so there is no audio input to AMP.Output no-load.

TPA6304.docx

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Taylor：

It is very strange that the oscillation will be here when you change LC of input power on EVM. Please check power input.

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Bias liu：

I want to know if there are any specifications or restrictions on the design of the filter circuit here for power input.

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Taylor：

As I mentioned above, please check power input.