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LM5121: Output 60V/1.5A then close the input of LM5121 for 0.5s,after restart the LM5121 was working abnormal

Part Number: LM5121

Output 60V/1.5A then close the input of LM5121 for 0.5s,after restart the LM5121 is working abnormal,the output is what the input is,and the Switch is not work;Could see the voltage of Vss is grow up slowly under 1.2V during 4.5s