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LM5170: IC does not start?

Part Number: LM5170

Team,

The device was tested using the EVM card. Now it is used in a more complex way on a prototype card as a 2nd stage.
I will provide the schematics offline.

The device does not seem to start at all. Could you please check from the schematics what can prevent the LM5170 to start?

Thanks in advance,

A.