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PMP5726: Questions about the PMP5726 reference case

Part Number: PMP5726

Hello, seniors:

I want to refer to your PMP5726 case to make a full brick power supply with 48V input and 50V / 20A / 1000W output.

I have preliminarily studied the schematic diagram of your PMP5726, and I have some questions to ask.

1. The  PMP5726 schematics have 3 pages, the first one should be the main power part, and the second one should be the controller and driver part. I can't understand the third one. I think it should be a feedback isolation circuit. But it can be no circuits like optocouplers and op amps.

2. The main transformer T3 used in this case is the 55694 type transformer of Payton. I did not find the data sheet of this type of transformer on the Payton website. Can you provide the design manual of this transformer? I'm good to learn.

Thank you.