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UCC28250EVM-501: Questions for schematics

Part Number: UCC28250EVM-501
Other Parts Discussed in Thread: UCC28251, UCC28250

Hi team.

Customer has several questions about EVM schematics. Could you pls help to comment on it?

1. Customer want to add a buck circuit after D5 to ensure a stable VDD1 because they concern about unstable VDD1 when no load. Will it work? Do you suggest this way? The similar circuit is shown as below in red circle.

2. what's the function of circuit in below red circle? 

3. Do you have the excel design tool for UCC28251?

Thanks!

Rayna