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TPS53625: Dynamic decay issue

Part Number: TPS53625

Hello,

                 Customer test intel spreadsheet. When output voltage decay to 0.64V on 10A, The alert not assert. Per spreadsheet, it needs to decay about 0.59 V the will send alert. But the output of TPS53625 can't decay more below 0.64V even we add 20A load. Has any suggestion why output voltage can't decay more? Thank you. 

Schematics:

https://drive.google.com/file/d/0B4htKR16pRs8cUM4cTdQY3pUM0k/view?usp=sharing 

                  

BR

Patrick