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Class D Switching Power Amplifiers and Power D/A conversion

150uh - 62khz-500khz Ferrite Which Core?
150uh - 62khz-500khz Ferrite Which Core?
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Old 20th March 2019, 05:54 PM   #1
birgitay is offline birgitay
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Default 150uh - 62khz-500khz Ferrite Which Core?

Amidon company core lengths - frequency ranges are shown.
However it was very expensive.
What is the ideal core for a Class D amplifier with a frequency of 62khz-500khz?
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File Type: pdf Amidon Ferrit Frekans ve endŁktans değerleri.pdf (236.7 KB, 15 views)
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Old 20th March 2019, 06:54 PM   #2
rayma is offline rayma  United States
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Originally Posted by birgitay View Post
What is the ideal core for a Class D amplifier with a frequency of 62khz-500khz?
None listed will go that high, and those rated to 200MHz may have larger losses
near that limit. Why do you need 500MHz?
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Old 20th March 2019, 07:52 PM   #3
birgitay is offline birgitay
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500mhz not 500khz
Which ferrite cores in these ranges?
.
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Old 20th March 2019, 08:25 PM   #4
rayma is offline rayma  United States
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Originally Posted by birgitay View Post
500khz Which ferrite cores in these ranges?
Look at 3F3 ferrite.
https://www.ferroxcube.com/upload/me...le/MDS/3f3.pdf
https://www.ferroxcube.com/en-global...ad/download/11

Last edited by rayma; 20th March 2019 at 08:32 PM.
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Old 21st March 2019, 08:02 AM   #5
birgitay is offline birgitay
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ferrite cores are not available on these links
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Old 21st March 2019, 02:24 PM   #6
rayma is offline rayma  United States
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Originally Posted by birgitay View Post
ferrite cores are not available on these links
This is a manufacturer. You can order samples, or purchase through a distributor.
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Old 21st March 2019, 02:57 PM   #7
abraxalito is offline abraxalito  United Kingdom
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Even though I can't read Turkish, it looks like those cores are powdered type toroids. Whereas you were asking about ferrites in the thread title. Powdered types are likely to have higher losses than ferrite at the frequencies you're interested in.

For 150uH you'd want a gapped ferrite core like this one, it will need about 30 turns : B65815E0160A041 EPCOS / TDK | Mouser

If you're concerned about losses you should use multiple stranded wire, not single core.
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Old 22nd March 2019, 05:41 PM   #8
birgitay is offline birgitay
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rm14 with 0.80-1mm wire with 10 spiral coil. The value was 150uh. I left the air gap with paper tape for core.
Since the number of spirals is small, will mosfet transistors and ir2110 be damaged? I'm worried?
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Old 22nd March 2019, 06:09 PM   #9
MorbidFractal is offline MorbidFractal
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http://www.farnell.com/datasheets/528673.pdf


IIRC

Nmin = LI^2/Bpk.Ae


I^2 = 10 x 300E-3 x 198E-6/150E-6
I^2 = 3.96


It looks like your inductor will saturate at 2 amps.


More sums... might be wrong.


Work out what your peak audio current will be. Root2 * Irms.
Work out what half the ripple current will be. Vs/4FsL


Add them and call it Ipk


100W into 8R

Irms = 3.54A Peak audio current = 5.


Fs = 100KHz L = 150uH Vs=40


Half ripple = 0.67A


Ipk = 5.67A


Nmin = LIpk^2/Bpk.Ae



Nmin = 150E-6 x 5.67^2 / 300mT x 198E-6
Nmin = 81


Al = L/N^2
Al = 23nH/root turn


Unless there is something about your application that is very different from the approximate numbers I have used the core you have is not suitable for the task.

Last edited by MorbidFractal; 22nd March 2019 at 06:26 PM.
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Old 22nd March 2019, 06:25 PM   #10
birgitay is offline birgitay
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10 spir will also burn in 2 / amps. If I did what I did, I didn't hold 150. What could be the ideal core?
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