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LM5145: Mosfet is burning

Part Number: LM5145


I have a problem with LM5145. My system requirement like that;

Vin = 27-40 V

Vout= 24 V

Iout = 10 A

I prepared my circuit according to WEBENCH POWER. I used CSD18533Q5A as mosfet. 

But when ı power on to system, high side mosfet is burning and be short circuit later short time.

What could be the reason for this?

Thaks in advance to help

Best Regards