I would like to make a dc/dc buck converter. Having few resources I am limited on testing it on breadboard. So as you can understand we are talking about low power levels. For example I want to use the output voltage as a feedback and then do my stuff with opamps so I can produce the desired PWM. My question is about the isolation of the output voltage measurement. I know that in high power we have to use it (for example by using a current transducer or by an isolation transformer etc.)
However I see on various textbooks that they put parallel to the load another resistance so that they can make a voltage divider and they use that voltage (which is of course a fraction of the output voltage) as their input to their control. Do I really have to worry about isolation problems when I am considering power levels of 10Watts? If I just put a 10kOhm load and I use a 100kOhm as a voltage divider to limit even more the power level for my control, will that be enough? I guess I could try by trial and error and in the worst case scenario I will burn some opamps but I would like your input if possible!
Finally do you have any suggestions for “typical robust” Mosfets for such applications? I am interested on testing various generic control schemes such as PID control. Have in mind that I would like to use them on breadboard so a through hole solution would be perfect for me. I know that even just a transistor perhaps could work just fine but I am interested on n-Mosfets specifically. input voltage around 10V, output load 0.1-1A.
However I see on various textbooks that they put parallel to the load another resistance so that they can make a voltage divider and they use that voltage (which is of course a fraction of the output voltage) as their input to their control. Do I really have to worry about isolation problems when I am considering power levels of 10Watts? If I just put a 10kOhm load and I use a 100kOhm as a voltage divider to limit even more the power level for my control, will that be enough? I guess I could try by trial and error and in the worst case scenario I will burn some opamps but I would like your input if possible!
Finally do you have any suggestions for “typical robust” Mosfets for such applications? I am interested on testing various generic control schemes such as PID control. Have in mind that I would like to use them on breadboard so a through hole solution would be perfect for me. I know that even just a transistor perhaps could work just fine but I am interested on n-Mosfets specifically. input voltage around 10V, output load 0.1-1A.