Dear all,

I doing switch mode power supply. But, i got problem in understanding the mechanism to interface PWM to my buck converter using mosfet. Is it correct if i adjust the PWM, the voltage output of my buck converter will be depending on the PWM. Let say if i increase my PWM, than my voltage output will be increase and if i reduce my PWM, than my output voltage of the Buck converter will be reduce. Based on my calculation, my buck converter is enough to down converted the 12 Volt to 10 volt. By the way, i attached with this thread my simulation. Please advise if this is correct. thanks

 

Look here for an example of a buck converter: http://en.wikipedia.org/wiki/Buck_converter

Look here for an example of a boost converter: http://en.wikipedia.org/wiki/Boost_converter

Right now, all you have is an IRZ44 sinking current through R2, the 1k resistor; and you are not switching the IRZ44 on fully; for that to happen, you need to have Vgs=10 instead of 5.