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Class D Switching Power Amplifiers and Power D/A conversion

Kool Mu core chokes for the class D output chokes?
Kool Mu core chokes for the class D output chokes?
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Old 8th October 2017, 10:44 AM   #1
rhythmsandy is offline rhythmsandy
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Kool Mu core chokes for the class D output chokes?
Default Kool Mu core chokes for the class D output chokes?

Im planning to build an IRS2092 amp and wanted to know about the Kool Mu cores for the output choke. Can anyone tell me that is it excellent core for both quality and transient power transfer is good in that?
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Old 8th October 2017, 11:18 AM   #2
abraxalito is offline abraxalito  United Kingdom
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I believe Kool Mu is pretty much the same as Sendust. Can't help feeling its going to be rather lossy compared to a gapped ferrite core.
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Old 8th October 2017, 11:52 AM   #3
rhythmsandy is offline rhythmsandy
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Kool Mu core chokes for the class D output chokes?
Magnetics - Large Kool Mu Core Shapes

Just have a look at the comparison with various core materials.

you can check this thread where its mentioned as powdered iron cores getting hot at 400KHz
Amidon T200-2 core suitability for 1kWrms?
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Old 8th October 2017, 12:02 PM   #4
rhythmsandy is offline rhythmsandy
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Kool Mu core chokes for the class D output chokes?
Quote:
Originally Posted by abraxalito View Post
I believe Kool Mu is pretty much the same as Sendust. Can't help feeling its going to be rather lossy compared to a gapped ferrite core.
how much % lossy?
on the site it states that Kool Mu has lower losses than Powder iron core.
Magnetics - Kool Mu and Powdered Iron Comparison
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Old 8th October 2017, 01:19 PM   #5
abraxalito is offline abraxalito  United Kingdom
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Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Here are the plots for losses vs frequency from Ferroxcube. You'll be operating between 300 and 500kHz typically for classD audio. I'm seeing around 6W/cc @0.1T.
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File Type: jpg sendust.jpg (75.0 KB, 228 views)
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Last edited by abraxalito; 8th October 2017 at 01:22 PM.
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Old 9th October 2017, 12:45 AM   #6
theAnonymous1 is offline theAnonymous1  United States
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A few years ago I wanted to get some Ferroxcube TN26/11-3C20-A113 gapped toroids but couldn't find anywhere to buy them in small quantities.

http://ferroxcube.home.pl/appl/info/...0amplifier.pdf
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Old 9th October 2017, 02:50 AM   #7
rhythmsandy is offline rhythmsandy
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Kool Mu core chokes for the class D output chokes?
I have accessibility for the Kool Mu cores from Maginc so as per the specs wouldn't that help?
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Old 17th October 2017, 02:25 AM   #8
rhythmsandy is offline rhythmsandy
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Kool Mu core chokes for the class D output chokes?
Can anyone confirm me as I see the core losses in higher frequencies is less in this.

Generally for how much output power the wattage of the choke can be considered like

for 1000WRMS Class D amplifier so does it require 50W power handling choke? with heavier gauge wire.
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Old 19th October 2017, 07:44 AM   #9
kartino is offline kartino  Indonesia
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MS157060 is commonly used for 1000W typical.
T157-2 will be better
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Old 19th October 2017, 11:24 AM   #10
rafsky is offline rafsky  Italy
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You can also use classic ETD ferrite (N87, N97 or similar) with appropriate gap, the winding length is usually less, so less copper dispersion, an ETD29 from my experiments was much better than 130.2 up to 0,5Kw
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