 inductor for buck converter
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IamSmooth
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Wed Nov 10 2010, 09:21PM
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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
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I am winding an inductor with 10g wire for my converter. Is it ok to have two layers of wire, or should it just be one? If it is the latter, how does one get high inductance without having a really large ferrite core?
Also, it seems that one can size the inductor using this formula:
I = V/L * D*T
It would seem from this equation that if one wants more current, L is smaller. I would think that L should be bigger as the stored energy is 1/2 * L * I^2
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Sulaiman
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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
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One of the important parameters in this circumstance is 'stored energy'
(power = energy x frequency)
Once you have chosen a power throughput and an operating frequency
you need to find a core of suitable energy storage.
A solid (un-gapped) ferrite core cannot store much energy
you will need ferrite with an airgap OR a low permeability powdered iron core.
Have a look here  for a wealth of information.
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