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I have designed a flyback using the 3873 and modelled it in LTSPICE:
http://www.simonbramble.co.uk/dc_dc_converter_design/flyback_converter/flyback_converter_design.htm
And have written an LTSpice tutorial:
http://www.simonbramble.co.uk/lt_spice/ltspice_lt_spice.htm
This should help you master...
Design a switched mode power supply. Here is a design
dc to dc converter design / switched mode power supply design
I would recommend LTC3822:
LTC3822 - No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller - Linear Technology
this should explain a lot:Butterworth, Chebyshev and Bessel Active Filter Design
The gain is nothing to do with the Butterworth response. It is the location of the poles and zeros that determines what the Butterworth reponse looks like
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to speed up the switching of the FET you might need a MOSFET driver. I cannot see the difference between the 2 MOSFETs you have picked in terms of switched mode power supply operation
When I was at Maxim, we used to ask people to sketch the voltage across a capacitor when charged by a constant current source. That got rid of 30% of candidates. It is still a question I use today.... then go onto the harder stuff. The Art of Electronics is still a good analogue book (my copy is...
... or your gate resistor could be too low. If you are going to put a resistor in series make sure it is no more than 10 Ohms. You want good gate drive, but sometimes the 10 Ohms will dampen any such oscillations
have a look at this excellent tutorial:
Buck Converter Design
YOu need to balance ON resistance with Qg to get the switching losses and conduction losses down. If the duty cycle is low, ON resistance becomes less important
Take a look at this tutorial:
Inverting Converter Design | Cuk Converter Design
This will take you through the basics. You can simulate it all in LTSpice:
LTSpice Tutorial | The Complete Course
LTSpice is the best way to simulate anything like this. You will find a model on the web somewhere. If you want to learn LTSpice, see this
LTSpice Tutorial:LTSpice Tutorial | The Complete Course
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