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LTM4622A parallel combination issue

Dear Sir/Mam,

Please find the attached schematic for your reference.

Input Voltage: 16VDC

Output Voltage Required: 12VDC/4A

I have designed a schematic as per figure No: 28 in the LTM4622A datasheet.

But when I connect the input supply, it get burned.

Please let me know if I am doing anything wrong.

Thanks in advance.