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Old 31st January 2011, 11:57 AM   #31
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Originally Posted by Cristi View Post
Single channel, IRS2092S driven class D amp, output power up to 600W (with other MOS-FET's and caps) the shown one has 300W. the main application is multi-channel amplifiers. it only requires the main differential supply voltage, and has some ingenious power management scheme to save power as much as possible. Dead-time is set to min. 25ns, and the pk-pk overshoot is about 2V only, due to the tight layout.
I've made them for a friend who integrates them in some amps which he build. Soon i will have a batch for sale on my site too.
Nice!!!
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Old 1st February 2011, 10:49 AM   #32
ljm_ljm is offline ljm_ljm  China
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Originally Posted by moschfet View Post
hi people,

I have build a prototyp with irs2092 and irfb4212. Two things struck me.

-the amplifier have a strong noise, I can it hear till 50cm from the box.
-the amplifier disturb the the radio(HF-radiation).

Do you have similar experiences?
AMP in the use of noise in this very small, I took him to work in 680K HZ.
Using shielded filter inductance. 22UH, will be about +-40V 680K square wave signal filtering is very thorough.

The remaining approximately 200MV + - 680K HZ sine wave.

Most of the noise because the ground is because the PCB LAYOUT interference caused
Please refer to IR IRAUDAMP7S PCB LAYOUT.


I also have IR official template design products. In use, did not hear a difference.


Thanks everyone
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Old 1st February 2011, 08:27 PM   #33
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Originally Posted by ljm_ljm View Post
AMP in the use of noise in this very small, I took him to work in 680K HZ.
Thanks everyone
I had a problem with my first 2092 pcb.
I tracked it down to noise on the VCC line.
I fixed it with a 47uf right next to the 12 volt regulator.
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Old 1st February 2011, 09:07 PM   #34
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Originally Posted by nigelwright7557 View Post
I had a problem with my first 2092 pcb.
I tracked it down to noise on the VCC line.
I fixed it with a 47uf right next to the 12 volt regulator.
I have a question about that. My circuit isn't really functioning well.
I followed the application diagram except i added some decoupling. A BIG capacitor over the drain and source of both fet's, a BIG capacitor over the B+ and B- and a pretty big one from my VCC to B-.

For the VCC i used a 7812 with input +B, reference (gnd) -B and output the VCC line. I found this in the IRAUDAMP document, but that means it has a voltage drop of 40V or something? Isn't that way too high?

THen my last question: Is it possible to test it without connecting the low pass filter and speaker? I want to measure it first before adding a big load..
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Old 1st February 2011, 09:14 PM   #35
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Originally Posted by Boudemaniak View Post

For the VCC i used a 7812 with input +B, reference (gnd) -B and output the VCC line. I found this in the IRAUDAMP document, but that means it has a voltage drop of 40V or something? Isn't that way too high?

THen my last question: Is it possible to test it without connecting the low pass filter and speaker? I want to measure it first before adding a big load..
I use a 200ohm dropper resistor from 45 volts to the regulator.
You will need to decouple the regulator on the input and output as close to the regulator as possible

I was getting something like a 1KHz tone when the regulator wasnt decoupled properly.

I was also getting quite a bit of background noise until I earthed the input ground.
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Old 2nd February 2011, 03:54 AM   #36
luka is online now luka  Slovenia
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Boudemaniak, show the pcb
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Old 2nd February 2011, 07:23 AM   #37
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Originally Posted by luka View Post
Boudemaniak, show the pcb
Click the image to open in full size.
Click the image to open in full size.

I am still unsure about 2 things.
1. Isn't it working because i did add the load?
2. Are my decouple capacitors placed correctly? (1 over each fet from drain to source.. shouldn't it be drain to ground?)
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Old 2nd February 2011, 07:44 AM   #38
luka is online now luka  Slovenia
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1.well load is part of the output filter, so yes you should have it connected (even if few times higher then intended)
2. capacitor from v+ to gnd, and from gnd to v-

Power tracks are narrow, probably too long also, only single gnd (you could find my amp or look for 2092 app note how grounds should be placed)
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Old 2nd February 2011, 07:49 AM   #39
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Originally Posted by luka View Post
1.well load is part of the output filter, so yes you should have it connected (even if few times higher then intended)
2. capacitor from v+ to gnd, and from gnd to v-
But the feedback is placed before the low pass filter. I thought this shouldnt be a problem.. But ok, i'll add the LPF and a power resistor.

And capacitors should not be placed over the drain and source then? Man, what was i wrong I'll try it now

Last edited by Boudemaniak; 2nd February 2011 at 07:53 AM.
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Old 2nd February 2011, 08:35 AM   #40
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Well, did all of the above things and added a 100Ohm resistor as load. The current now is 200mA for V- and nothing for V+. It seems like the IC isn't driving the fet's (although we dont have a short now ).

Is the VCC correct? I used a Lab-supply with the - connected to the V- and +12V connected to the VCC. This means that it's -8V (with +-20V supply) with respect to ground.

Any ideas?

Ps: CSD Isn't resetting, so that's a good thing
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