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Class D Switching Power Amplifiers and Power D/A conversion

Iraud 350 problems :(
Iraud 350 problems :(
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Old 7th June 2016, 06:33 AM   #11
phase_accurate is offline phase_accurate
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Join Date: May 2002
Location: Switzerland
You don't need to reproduce 20 Hz just to try if it works. I didn't mean to use a cap as the final solution. Just to try whether the problem is caused by the DC current and if the amp is working fien otherwise. I would fake a non polarised capacitor by using two electrolytics in anti-series for this purpose.
How large is the DC offset ? Maybe it is even withoin the usual limits of this amp. But with a DC load of 0.3 Ohms it doesn't take a very high offset voltage to cause bus runaway.

If the amp is not defective it might be a good idea to try some kind of offest correction.

An additional 1/1 transformer would block DC between its primary and secondary windings. But its primary winding would still see DC and this is what the class-d amp doesn't like. To be more exact: Class-D amps as such can handle DC current and very low frequencies just fine. It is the PSUs that have a problem with the current that the amp pumps back into the rails. It would of course be possible to build PSUs that can handle this properly.

Regards

Charles
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Old 7th June 2016, 06:21 PM   #12
JazmynFox is offline JazmynFox  United States
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Join Date: May 2016
Hi,

I got the new board today and it has no problems. Works fine with no DC offset even on the 0.3ohm primaries of the Electrostatic step up transformer.

I am guessing the output transistors on the other board were poorly matched? I really don't know.

I have heard that you can replace the transistors with higher quality ones for better 2ohm performance.

Any ideas?

I have also thought about using iraud 200 boards instead. I have heard they are a bit nicer quality. I am looking for amps that can do about 500w - 1000w into 4ohms and 300-500w into 8ohms. Know any alternatives?

Thanks again.
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Old 23rd October 2017, 07:10 PM   #13
ShopFloh is offline ShopFloh
diyAudio Member
 
Join Date: Oct 2017
Quote:
Originally Posted by phase_accurate View Post
You don't need to reproduce 20 Hz just to try if it works. I didn't mean to use a cap as the final solution. Just to try whether the problem is caused by the DC current and if the amp is working fien otherwise. I would fake a non polarised capacitor by using two electrolytics in anti-series for this purpose. ...

Charles
Hello dear community! Sorry for my English, I come complete with Google Translator, understand only German language. Here is my 1st post to you professionals:

I have received in Germany 2 plagiaries IRAUD350 via eBay from China.
These modules are equipped with Mosfet B23N20D and both modules were broken immediately within 3 weeks with silent music in the closed PA housing with good fans via flash.

Can I install the IRFB4227PbF 2x without further changes?

On the right was a semiconductor, I would like to buy it in Leipzig tomorrow. But what is the name of the part? The problem is, I find the IRAUD350 no exact circuit diagram in the Internet.

The manufacturer and the seller are probably not really reputable, I have on request no useful answer get.

Can you help me here please?
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