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WEBENCH® Tools/TPS54560: TPS54560 IS NOT WORKING WITH 48V SUPPLY

Part Number: TPS54560

Tool/software: WEBENCH® Design Tools

Hi,

I made a DC / DC converter using the TPS54560,Designed for 5v and 12v .

 It is made with the help of TI Webench designer (Design : 4981885/16 TPS54560DDAR for 12v ) for 5v (Design : 4981885/18 TPS54560QDDARQ1 for 5v).Both designs are on the same board and its four layer 

Our requirement is max input voltage is 58v, its designed for 60v. It is working fine till 40v but when i give 48v supply ,We observed that spark near the ic after that its not working.

Please find the attachments.

Do you have any suggestions to give me?

 

Thank you in advance for your help.12V-buildIt_assy_doc_4981885_16_253568459.zip5V-buildIt_assy_doc_4981885_18_415094319.zip