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Question about the reference ground of UCC27322

Other Parts Discussed in Thread: UCC27322

In application, I have used the output of DAC as the input voltage to generate a voltage source which is the reference ground of UCC27322.

My questions are when UCC27322 is switching:

Is the voltage source or cap connected between PGAND and voltage source used as the current return path?

How to check the load limitation of this voltage source?

Many Thanks in advance.