Baseline drift as the duty cycle changes sounds like you might have the oscilloscope on AC coupling. Use DC.
Yes, you can use single supply and to simplify the circuit you can use sawtooth oscillator instead of a triangle gen.Jony Would you suggest a single sided supply, and a sawtooth oscillator?
All you need is triangle/sawtooth oscillator, error amplifier and the comparator.I need so many op amps, because I am controlling the output of the buck converter. Two of them are for the oscillator, and four are for the PI controller (one subtractor, one summer, one proportional gain, and one integral gain) finally the LM311 to compare the PI signal to the oscillator signal... I am not sure how else to do it.
IR4427 is a low side driver, but in your buck converter IRF520 work as a high side switch.I am not sure how bootstrapping would help me..
Simply, in your circuit the mosfet work as source follower and that means that the voltage at mosfet source (left side of a inductor) voltage cannot be larger then 5V-Vgs.I am not sure what you mean about the mosfet driver being a low side driver vs the mosfet being a high side switch? pardon my lack of knowledge..
But you can build PI controller using only one op amp.As for the abundance of amplifiers - I need to utilize PI control
For which Vo =?? and I_load =?I picked the values for the inductor and capacitor based on the formula ripple = Vo*(1-D)(Ts)^2/8LC Using a output ripple of 1% and a 50% duty cycle. But also the change in output current is given by (Vs-V0)DTs/L So I can size L and then choose C accordingly based on the first formula. I got these formulas from Mohan:Power Electronic converters textbook. I can see how they were derived.
Ok I see, for such a large load current L1 value looks good.Vo as 20 v I load as 4 A
I understand about the op amp now.
Sure I understand now, this driver needs a higher voltage, right?
But it's only rated for 20,