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LM73605: EMI or SW noise inhibition solution

Part Number: LM73605

Hi Guys

Our customer use LM73605 to realize 5A DCDC. About the SW ring inhibition, they think add a RC between VIN and SW pin.  Just as below. Could you help me understand how to achieve SW ring inhibition? Any calculation documents? I think we should add this RC between  Cboot and SW or RC snubber between SW and GND. right? 

If their solution can inhibit the EMI. how to choose the RC value?