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TPS54531: Surge issue for TPS54531?

Part Number: TPS54531
Other Parts Discussed in Thread: TPS2511

Dear Sir:

                We used TPS54531+ TPS2511 for USB charger on motorcycle as below block diagram and our customer injection surge to input of TPS54531 , Then they measure single from TPS2511 output  ,The surge single have increase as below picture , Is it normally? Does TI have some suggest to us? Thanks.

Best Regard

Jason