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LM5116: Mosfet very hot

Part Number: LM5116

Dear TI Support,

 

I designed a circuit using your Webench.

 

The input is 12-20 V and the output is -15 V, at 2 A.

According to the schematics attached, the temperature of M1 MOSFET goes too high that it can not be cooled even with a heatsink.

Also, the output voltage decreases, even without any load on the output.

 

What can be the problem?

 

Please let me know.

 

Thank you very much.

 

Sincerely,

4670.WBDesign1.pdf