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UCD3138: UCD3138 single phase pfc

Part Number: UCD3138

I am using Fusion digital power studio of single phase PFC.

1  - What was the gate driver circuit used in this?? How are the gate pulses given to the Mosfet  generated.??

2 - The pins present in the circuit like Vbus feedback, I rec_feedback , where do we connect those pins?? For the encircled pin, kindly state the connections.