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UC1825B-SP: DC/DC isolated supply example inquiry

Part Number: UC1825B-SP
Other Parts Discussed in Thread: PMP

Tool/software:

Hi, I'm wondering about the suggested "isolated DC/DC Power Supply" application example for the UC1825B-SP component. I don't see how the depicted example will provide isolation given the voltage divider feedback, or even how the design would function with the lack of return path if the two grounds somehow are isolated.

Am I missing something here?