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LM5149: Unused VCCX pin GND or OPEN?

Part Number: LM5149

Hello team,

I am not using VCCX pin.

On the datasheet, unused VCCX pin should be tied to GND.
However, on LM5149EVM, VCCX pin is left floating.

How should I connect VCCX pin?

Is connecting VCCX to GND or floating result the same operation?

Best Regards,
Kei Kuwahara