Adding the can does indeed increase the capacitance but to a tiny degree. However, it also reduced the inductance which is where the higher frequency response comes from. Band pass filters are almost always a two way game between capacitance and inductance. Generally increasing the gap between the signal and ground will reduce capacitance but increase inductance and the opposite will also hold true.
Nice video, Fesz. I was always taught never to go through the core on anything needing tight tolerances. I'd be very interested to see you redo this using a 4-layer board, with SIGNAL on Layer 1 and GND on Layer 2. I think that'd help, too. Especially with repeatability.
I'll have to try that at some point. With this design I went with the idea that a large distance trough the dielectric should help with lower losses since the traces are wider. However, as you mentioned the tolerances should be higher, so its a compromise...
Hi, Please make a video on SMPS feedback loop compensation design in LTSpice simulation and in real life also based on actual plant response and tuning parameters, specifically for FLYBACK DCM & CCM mode with a voltage mode and current mode PWM controller Ic. & how to design transformer for a wide range of output voltages. & also explain what to look for in bode plot for the best stability criteria.
