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LM5022: input>6.5V, output will over 40V damaging next level

Part Number: LM5022

Tool/software:

Hi Expert,

My customer using LM5022, but find one issue that, input 5.5V-6.5V, output is 40 V, under expectation. when input >6.5V, output will be over 40V, damaging next level, here is the schematic. please help to review. 

Br

Chi