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TPS40322: How to Protect TPS40322 under test start up Over voltage protection ?

Part Number: TPS40322

Dear ALL

Pls help to me .How to protection TPS40322 under test start up over voltage protection  ?

Condition test is below .

1.Start up Over voltage protection test :

Condition test :Open feed back of TPS40322 then power on the unit   

Result :The TPS40322 is damage

 

2.Continous over voltage protection test :

Condition test :Power on the unit then open  feed back    of TPS40322

Result : The TPS40322 is not damage

Thank you so much & Bestregard

Prarinya