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LMG1210: Multiple megahertz switching problem

Part Number: LMG1210

Hi

Now i am working on LMG1210.

I designed a full bridge using 1210 for class d amplifier.

When switching frequency is more than 3MHz it generates distorted waveforms.

And so many times my LMG1210 5V power supply turned off due to over current.

Switching frequency below 3MHz it is perfectly working.

Is that the problem is Ground bouncing?

I am mot added any isolation!!!