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TPA3220EVM-MICRO: CLIP_OTW LED flickering and output switching "on/off"

Part Number: TPA3220EVM-MICRO

Hi, 

I am having issues with the TPA3220 EVM MICRO. I set everything up according to the quick start instructions in the user guide, using 5 ohm resistors as a load. Connecting a signal at 1kHz with amplitude (10mV ... 150mV), I get the following behavior:

  • CLIP_OTW LED is flickering (increases with input amplitude).
  • Measuring (differentially) the output voltage across the load, I see that the output is switched of every 2 ms for 1.5 ms or so. A screenshot of the scope is attached.
  • even when setting the input amplitude to 0, I observe this 'switching'. But no LED flickering. (second screenshot)

Is the device broken, or what could be the reason for this strange behavior?

Thank you very much for any help.

Best regards,

Chris

No input signal: