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LM25575 inverting design - where to connect exposed pad?

Other Parts Discussed in Thread: LM25575, LMZ14203

We use LM25575 in an inverting design to generate -11V from 12V input.

The webench design doesn't show where to connect the exposed pad (EP).

Where should EP pin connected to GND or Vout (-11V in our case)?

Or we could connected to either of them because it doesn't matter (is not internally connected to the die)?

We would prefer to be able to connect it to board GND as that is the plane we have a lot of copper on.

Thanks,

Valentin