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LM5145: Mosfet is burning

Part Number: LM5145

Hi

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

Mehmet