Class D Power Amplifer

378

09:05:03

Class D power amplifier using the classic triangle wave x signal comparison to generate a PWM signal that is used to switch MOSFETs which dump power into a low pass filter, recovering the original form of the signal. Adjust the capacitor to see ripple form as a result of the filter, and see how the relationship between the signal frequency and triangle wave frequency affect the output.

published 6 years ago

fatcat2

6 years ago

But the filter possesses too much ripple. I calculated the values of the components:- L=R/(2πf)=16mH & C=1/[{(2πf)^2}*L]=160uF. Plug out these values and see the output ripple!

fatcat2

6 years ago

I know that you were trying to increase the frequency spectrum of this amplifier but doing so won't work for low frequency as a sufficient no. of harmonics are passed. So in my circuit, the cutoff frequency is set at 100 Hz.

hurz

6 years ago

@fatcat2, and your LC combination is for a critical dumpening of a parralel resistor load of 5Ohm

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