IRS2092 (IRAUDAMP7S) + IRFI4019

[dudaindc]

Originally Posted by Cristi

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!!!

[ljm_ljm]

Originally Posted by moschfet

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

[nigelwright7557]

Originally Posted by ljm_ljm

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.

[Boudemaniak]

Originally Posted by nigelwright7557

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..

[nigelwright7557]

Originally Posted by Boudemaniak

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.

[luka]

Boudemaniak, show the pcb

[Boudemaniak]

Originally Posted by luka

Boudemaniak, show the pcb

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?)

[luka]

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)

[Boudemaniak]

Originally Posted by luka

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

[Boudemaniak]

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