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TPA2011D1YFFEVM: using audio-D amplifier with non-sinusoidal waveforms

Part Number: TPA2011D1YFFEVM

Hello,

I am evaluating the TPA2011 using the EVM module and I have a question:

 I am passing it though a LPF with a cutoff at 60 kHz so to remove the 300 kHz switching modulation. Then I am driving a resistive load.

This works pretty well when using a sine waveform. Triangular waveforms works as well.

I am most interested in a square waveform. When the amplitude is <0.9V it works well, but when the amplitude is greater than 0.9 V it will execute just a few periods and then the output switches to zero.

I imagine there is some kind of feedback that actively suppresses the square-wave. is this true? Is there a way around it?

Are there other eval kits that are better suited?

 

Kind regards,
Matthias