LM49352: lm49352 Class D amplifier LS+/LS- waveform and failure issue.

Part Number: LM49352

Hi,

As mentioned on datasheet, LS+ and LS- should have a 300KHz waveform after power on. But I get a 450KHz waveform as measured. Please explain how and why the frequency of the waveform is affected?

The speaker has voice for couple minutes even the frequency is 450KHz, but the waveform is gone forever after a few minutes. And it can't be recovered by cut off power. It seems class D amplifier is broken. Can you also explain this?

Thanks,

Roger Luo

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