How much power can a T130-2 core handle? - diyAudio
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Old 17th August 2012, 02:20 PM   #1
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Default How much power can a T130-2 core handle?

Can anyone give me a clue on how much power a T130-2 core can handle?

I'm still a noob with this inductance/inductor stuff, so please forgive me if the question is worded incorrectly.

I'm interested in replacing some 10uH and 20uH inductors with gapped ferrite toroids. The data for the size and permeability of the new cores gives me max current ratings of 12.25A (10uH) and 17.32A (20uH). That's assuming I got the math correct (big assumption there).

I just need to know if the gapped cores have substantially less power handling or not compared to the T130-2.

Thanks
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Old 17th August 2012, 02:30 PM   #2
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It depends directly on frequency. Which one?
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Old 17th August 2012, 02:55 PM   #3
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Well, for the sake of argument lets just say 300kHz.
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Old 17th August 2012, 03:15 PM   #4
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As a first approximation, see this link:

Amidon IRON POWDER TOROIDAL CORE

Knowing current and voltage, you can estimate power, then given frequency, choose a core. Check if it doesn't saturate, and that it can dissipate power lost in the core and wire without exceding temperature rising.

Good luck.
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Old 17th August 2012, 03:22 PM   #5
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Quote:
Originally Posted by Osvaldo de Banfield View Post
Good luck.
No kidding.

Haha, thanks though... I'll go chew on this for awhile and see if I can manage to swallow it down.
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Old 17th August 2012, 03:36 PM   #6
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I am still working on the sheet, So need not be error free.

See if this could be of any help to you. I am working using micrometals core in mind.

attached sheet.
Attached Files
File Type: pdf Mathcad - Test Coil design.pdf (24.8 KB, 30 views)
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Old 18th August 2012, 12:36 AM   #7
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Quote:
Originally Posted by theAnonymous1 View Post
Can anyone give me a clue on how much power a T130-2 core can handle?
This app note has a bit of info in it about core size and power dissipation: http://www.micrometals.com/appnotes/...s/ipcs4rfp.pdf

Quote:
Originally Posted by theAnonymous1 View Post
I just need to know if the gapped cores have substantially less power handling or not compared to the T130-2.
Powdered iron cores technically have an air gap that is distributed evenly throughout the entire core. So try not to think of power handling as a function of the size of the air gap.
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Old 18th August 2012, 12:53 AM   #8
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Hi Brian, nice to see you're still lurking in the shadows.

Some of the math and general comprehension required here is beyond me. I'm just going to do what I always do and run with what little I understand and hope for the best.

I'm pretty sure the Ferroxcube cores I'm interested in are more than sufficient for my needs anyway.
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Old 18th August 2012, 01:13 AM   #9
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Are the ferroxcube cores the same ones used on other fairly high output power class d amps? If so, you should probably be fine.

When in doubt, look at what other amps with similar power ranges are using and use that as a baseline.
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Old 18th August 2012, 12:13 PM   #10
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Are the ferroxcube cores the same ones used on other fairly high output power class d amps? If so, you should probably be fine.
I was tempted to just assume that at first, but they do custom parts so I started thinking maybe some of these OEMs had parts made with lower permeability than the standard gapped cores.

Stacking cores is always an option to if space permits.
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