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need help with buck converter

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f1blop

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hi everybody, thanks for reading my post, I hope somebody can help me with this issue.
I'm making a basic 12V to 5V-0.5A-continuos mode-buck converter using SG3524 IC, P-Channel MOSFET, schottky diode, etc. When I test only the pwm and the mosfet it work fine, schitching at the right frequency, but when the rest of the ciruit is implemented and I try to measure the voltage in the diode I can't see the signal I'm expecting to see.
I don't know what's happening because at the output I'am having the right voltage (5V). It could be something related to the operation mode.
I'm forced to use a 20mH inductor.
Please help me
Buck.jpg
 

Check inductor. May be 20 uH ?
 

please post the waveforms you are obtaining so that we can figure out what is the problem....
 

my project is 48v to 12 v buck converter in continuous conduction mode using matlab simulink.but it is difficult to me to make a simulink model of PWM which hass as out put duty cycle 0.12.can some body help me plz?
 

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