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UCC25640EVM-020: Why split resonant capacitor used

Part Number: UCC25640EVM-020

Hello,

I wanted to understand the value of resonant capacitor from below schematic of reference design UCC25640EVM-020.

C1 and C17 both are resonant capacitor in split or only C17 is the resonant capacitor. If split is the resonant capacitor combination, then what is the reason to put resonant capacitor in split?