Some little FETS like a 2N5457 or 2N5484 have a maximum current of only 5mA.
Many power Mosfets like an IRF3711Z have a max continuous current rating of 92A or 380A in brief pulses. It is also a FET.
The datasheet for ALL Mosfets shows their maximum on-resistance, then you can simply calculate their voltage drop.
My work using a triangle waveform and a sine waveform to create a PWM modulation output
Take a look:
What I don't understand is
1.) How does a triangle waveform and a sine waveform , the difference between the two will create a pulse width modulation waveform?
2.) I can't tell on my oscilloscope the difference between a square waveform VS a pulse width modulation waveform, they both look the same to me, so how do I tell the difference between the two?
How is that in series? That is clearly a buffer with open collector output.
Wonder how and how did that schematic, without points denoting junctions it is really confusing and ambiguous.
2.) I can't tell on my oscilloscope the difference between a square waveform VS a pulse width modulation waveform, they both look the same to me, so how do I tell the difference between the two?
A square wave has 50% duty cycle, pwm has variable duty cycle.
The triangle is much faster than the sine wave, so the output is high whenever the triangle is lower then the sine. So for a voltage on the sine input just a bit lower then the peak of the triangle you get a narrow pulse on the output, and you get a wide pulse when the sine is just a bit above the bottom of the triangle.
square wave is called square because the high and low is the same length. What you mean is correctly called a rectangular wave.
The frequency of the trianlge will not change anything on the pwm duty cycle, but only as long as it is significantly faster then the modulating signal. Otherwise if the modulating signal is changing too fast the output will not make a lot of sense and the duty cycle will not be proportional to the modulating input.
So any squarewave that has a duty not of 50% is called a rectangular wave?
What I don't get is
1.) I don't see the modulation on the oscilloscope, all i see is a square waveform
What does the modulation look like?
How it it a modulating signal when I looks to me like a normal square waveform, where is the modulation at?
No, the pwm output is on when the triangle is higher than the sine, and vice versa.
The output has a bit slow rise and fall times, so the transition doesn´t look exact, but they occur at the point where the sine and triangle cross.