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UCC28070EVM: UCC28070 300-W Interleaved PFC Pre-Regulator Design

Morty Xu
Prodigy 10 points
Part Number: UCC28070EVM
Other Parts Discussed in Thread: UCC28070

UCC28070 300-W Interleaved PFC Pre-Regulator Design

https://www.ti.com/lit/an/slua479b/slua479b.pdf?ts=1660704064680&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FUCC28070EVM%253FkeyMatch%253D%2526tisearch%253Dsearch-everything%2526usecase%253Dpartmatches

In this design, Figure 9. 300-W Prototype Mother Board Power Stage.

What is the purpose of D7/D8/C3/C4/R6 ?

Why should the circuit composed of these devices be combined with the current sampling circuit (CSA)?