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Class D Switching Power Amplifiers and Power D/A conversion

200W IRS2092 Amp for
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Old 21st September 2019, 02:49 AM   #521
Turbowatch2 is offline Turbowatch2  Germany
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Hans, sometimes you do strange things for unclear reasons. Maybe the amp has died now, because he was happy the way it was and needed the regulator it had? Why remove a working regulator and install a problematic step down? An oscillating problem that other people would, maybe, remove out of an audio device?

There is a saying: Do not fix it if it is not brocken. This makes some sense, donīt you think?

Do you have a schematic for the amp? If yes, someone could figure out what you did and why the amp responded like it did.
If no, no one can tell you what you did. Do you have any idea?
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Old 21st September 2019, 06:17 AM   #522
hansueli is offline hansueli  Switzerland
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Thanks for answer

The problem was that with 48v the regulator got to hot.

I have schematics.

On similar amplifier the use step-down for vcc.

That was the reason.

With new power supply in future I will not have this problem any more...
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Old 23rd September 2019, 11:04 AM   #523
Turbowatch2 is offline Turbowatch2  Germany
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So you got it working again? Great!
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Old 23rd September 2019, 11:10 AM   #524
Turbowatch2 is offline Turbowatch2  Germany
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You can get the regulator input voltage down by simply using some resistor to turn the too high voltage into heat. A passive solution might be less complicated.
Alternative: Use a pre-regulator, so the load is shared between the two.
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Old 23rd September 2019, 11:11 AM   #525
hansueli is offline hansueli  Switzerland
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No



I have no response from the ICs



Thats the schematic and the VCC part... I think this have bruned the IC...
Attached Images
File Type: jpg 12V VCC.JPG (74.6 KB, 163 views)
File Type: jpg irs20922.JPG (113.7 KB, 126 views)

Last edited by hansueli; 23rd September 2019 at 11:18 AM.
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Old 23rd September 2019, 11:15 AM   #526
Turbowatch2 is offline Turbowatch2  Germany
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Maybe try to open the schematic after posting?
I can not see anything...
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Old 23rd September 2019, 11:19 AM   #527
hansueli is offline hansueli  Switzerland
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Some times IMGBB has some problems...
Sorry.
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Old 23rd September 2019, 01:19 PM   #528
Boydk is offline Boydk  Denmark
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Not to be an ***, but is it possible, that you broke some of the "platings"?? (donīt know if itīs the right word for the tiny copper tubes that go from top to bottom of the pcb connecting all layers) when you removed the old capacitors??? If itīs made as a 4-layer PCB, the damage is not repairable. I 2-layer you might be lucky to find such an error. Also one of my friends found a slight reverse leak in the diode that goes to pin 15 when his version died just out of the blue. Replacing it with a MUR120 solved it.

Last edited by Boydk; 23rd September 2019 at 01:23 PM.
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Old 23rd September 2019, 01:26 PM   #529
hansueli is offline hansueli  Switzerland
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the amp does not smok or something.


So it could be no problem in PCB
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Old 23rd September 2019, 03:19 PM   #530
Boydk is offline Boydk  Denmark
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Quote:
Originally Posted by hansueli View Post
the amp does not smok or something.


So it could be no problem in PCB
Thatīs no guarantee..... Broken supplylines, and the crap doesnīt work anymore. Nor does it smoke/burn
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