what class-D amps can run off of +/-90VDC rails? - diyAudio
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Old 5th November 2012, 03:13 AM   #1
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Default what class-D amps can run off of +/-90VDC rails?

I have the luck of recently purchasing some beefy transformers that can be used in a linear power supply which will result in rail voltages of +/-89VDC. I'm looking for candidates for these amp boards, which I plan to use the amps 8-ohm subwoofers. Unfortunately, this is above the recommended rail range for most of the class-D amps that I have seen. I'd prefer class-D because power dissipation in class AB is going to be too much for my application.

So far I have identified ONE viable candidate: The ColdAmp Sonora S750:
https://www.coldamp.com/store/sonora-s750.html
This amp is spec'd to run on rail as high as +/-94VDC, so I have a couple of volts to spare. This amp can produce about 400W into 8 ohms, which would work well for me.

Any other class-D amp boards out there that will work? Any thoughts on these new Sonora products from ColdAmp?

-Charlie
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Old 5th November 2012, 03:18 AM   #2
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I keep us informed. I have an amp chassis and transformer from a dead class-D amp that has about the same voltage rails! I need a new design to put in the chassis!
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Old 5th November 2012, 03:36 AM   #3
DUG is offline DUG  Canada
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How about this full wave cct.

Review the pdf on catalog page 11 (page 13 pdf pages)

Try it, you might like it.
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File Type: jpg FULL-WAVE-B.JPG (9.0 KB, 480 views)
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Old 5th November 2012, 03:40 AM   #4
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Watch out for supply pumping using half-bridge modules.

UcD700HG and UcD2K are also suitable for that supply voltage.

If those are outside your budget, I know an IRS2092 board can be designed to handle high rails, but can't point you to any specific modules for sale.
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Old 5th November 2012, 04:44 AM   #5
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It looks like Connexelectronics can configure an IRS2092 board to run off of up to 95V rails:
IRS2092 modular amp at 91v with A1000SMPS

Maybe I will EMail Cristi about it...
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Old 5th November 2012, 05:17 AM   #6
DUG is offline DUG  Canada
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oops, forgot to paste url:

http://www.hammondmfg.com/pdf/5C08.pdf
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Old 5th November 2012, 04:14 PM   #7
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Quote:
Originally Posted by DUG View Post
How about this full wave cct.

Click the image to open in full size.

Try it, you might like it.
I don't like it if you can't use it to make a DUAL RAIL power supply...

Thanks anyway.

-Charlie
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Old 23rd November 2012, 04:47 PM   #8
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Bump...

I'm still looking for class-D amps that can operate from dual +/- 90VDC rails..

After checking out the Connexelectronics units, I think that this would be pushing them too close to the limit.

So, any other options?

-Charlie
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Old 24th November 2012, 12:47 AM   #9
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Hi CharlieLaub
greetings will a diy class d amp operating at +/- 90 be ok for you only
thing you will have to etch your pcb
warm regards
andrew lebon
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Old 24th November 2012, 01:20 AM   #10
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Quote:
Originally Posted by andrewlebon View Post
Hi CharlieLaub
greetings will a diy class d amp operating at +/- 90 be ok for you only
thing you will have to etch your pcb
warm regards
andrew lebon
What is your suggestion for this "DIY Class-D amp"? I can design PCBs but I don't really want to spend the effort to do that for only a couple of units. I'm looking for off-the-shelf amp modules that I can power. Thanks

-Charlie
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