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LM5018: Problem with the LM5018 in design

Part Number: LM5018


I need, for a new design (a big production shall be following) , to use the LM5018MR/NOPB. Vin min:14V ; Vin max:60V ; Vout:12V ; Iout max: 250mA.

I've tried the shematic in the datasheet, with and without the diode, (it's bad with the diode), so i've tried with Webench.

I've done my design with the recommandations, and with the values gave in the shematic.

When i have no load, the Vout is correct ( about 12V)

But when i load with Iout = 50ma or more, the Vout decrease (6.6V), and the LM5018 become hot !

i don't understand

Please help me, i need to find a solution for this project, my Customer waiting my prototype and i'm blocked only there.

Best regards