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PGA900: gate driver

Part Number: PGA900

Hi  Scott :

      A month ago , I asked a question about the gate driver, you said"It's best to ground the GATE pin when the gate driver isn't used to avoid the possibility (although it is quite low) of damage."

Now , I want to know if the gate pin float, how  is it damaged ?Could you explain it clearly?

Another question: if the AVDD pin or the DVDD pin output  a low voltage (nearly to GND), what reason can cause it ? the VDD pin input is normal.

thanks and best regards

Kim