Buck converter (18.4V to 12V)

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viper550i

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Hi everyone
I need help in my simulation of a buck converter in Proteus ISIS
I did the same schematic in PCIM software and its works fine.... but i need it in proteus so i can control the Mosfet using Microcontroller

see the attached image
its oscillating between 1.2V and 1.4 V instead of giving me 12V
 

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