Doing a class D Amp project using TL494 - Page 36

circuitcity · 12th October 2009, 08:07 AM

Ok I see what you mean now.

The control book had circuits comprised of Op-amps as a PI controller and they used 4 resistors and 1 capacitor for a PI controller.

Well PI controller + Inverter..

My question is what's in the feedback path then after the RC low pass filter because I am confused now. I have a differential output when I need a single ended output. So what sort of circuit do i need to do this.

Diff amp like before?

This how I see the control loop as
http://img213.imageshack.us/img213/8120/10047089.png

And my PI controller as well
http://img122.imageshack.us/img122/1127/pi1.png

So I am clear on my PI controller now.. But the feedback path now I am confused now.

circuitcity · 12th October 2009, 08:23 AM

output/input = -R2/R1 + 1/R1*C*s = Kp + 1/T*s

So basically the proportional gain and the time constant Tau (integral block part)..

circuitcity · 13th October 2009, 09:17 AM

Any feedback on what I got to use in the feedback path. I have two inputs, which I need to convert into a single ended input before it get's summed with the music signal and so on.

alkoboss · 23rd December 2011, 02:57 PM

What happened to this project?
I read the whole thread and now I really wanna know what the circuit looks like.
I'm doing a similar project. What were the conclusions?
Thank you

Yusks · 18th April 2013, 03:50 PM

Amod, pls, if possible, share with us your 50W + TL494 amplifier circuit. Tks.

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12th October 2009, 08:07 AM	#351
circuitcity diyAudio Member Join Date: Jul 2009	Ok I see what you mean now. The control book had circuits comprised of Op-amps as a PI controller and they used 4 resistors and 1 capacitor for a PI controller. Well PI controller + Inverter.. My question is what's in the feedback path then after the RC low pass filter because I am confused now. I have a differential output when I need a single ended output. So what sort of circuit do i need to do this. Diff amp like before? This how I see the control loop as http://img213.imageshack.us/img213/8120/10047089.png And my PI controller as well http://img122.imageshack.us/img122/1127/pi1.png So I am clear on my PI controller now.. But the feedback path now I am confused now.

12th October 2009, 08:23 AM	#352
circuitcity diyAudio Member Join Date: Jul 2009	output/input = -R2/R1 + 1/R1Cs = Kp + 1/T*s So basically the proportional gain and the time constant Tau (integral block part)..

13th October 2009, 09:17 AM	#353
circuitcity diyAudio Member Join Date: Jul 2009	Any feedback on what I got to use in the feedback path. I have two inputs, which I need to convert into a single ended input before it get's summed with the music signal and so on.

23rd December 2011, 02:57 PM	#354
alkoboss diyAudio Member Join Date: Dec 2011	What happened to this project? I read the whole thread and now I really wanna know what the circuit looks like. I'm doing a similar project. What were the conclusions? Thank you

18th April 2013, 03:50 PM	#355
Yusks diyAudio Member Join Date: Apr 2008	Amod, pls, if possible, share with us your 50W + TL494 amplifier circuit. Tks.