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PMP21781: Cx1 of the schematic

Part Number: PMP21781

Hi expert,

Our customer has a 150V application and they refer to our PMP21781 reference design.

They found the Cx1 in the schematic is not the same with our general use, and the C11 is also DNP.

What is Cx1 here used for and why we connect FB and COMP using a capacitor? Is that related to the high output voltage?

Thank you!