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Designing of Buck Power Inductor/Transformer

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Pronay088

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Hi,
I am working on a buck converter design, later which will be used in a LED driver and I need some help on designing the power inductor of the converter.
First of all, I am limited by some specification of the transformer, provided below:

T1.JPG

I read some document on designing transformer, but that seemed kinda puzzling. So I need some proper direction and tips on how to design this inductor maintaining all parameter, if possible suggest an simulation soft for this kinda design!
Oh I forgot, this transformer belongs to EP13 series!

Thanks in advance.
 

Saturation spec for the inductor reads 1.1A. Therefore you cannot expect greater output current than maybe 1 A.

if possible suggest an simulation soft for this kinda design!

See my post below. It has a link to a simple buck converter (in Falstad's animated interactive simulator). You can choose between operating it by clicking a switch, or you can let it be clock-driven.

The link will:
a) navigate to the falstad.com website
b) load my schematic into the simulator
c) run it live on your computer

https://www.edaboard.com/threads/268178/#post1150890

Your computer needs to have Java installed.

Change a value by right-clicking a component, then select Edit.
 
Thanks for the simulator program. One more thing, how can I calculate turn ratio from the data given above? Is there any simpler way, as the AL value is unknown?
 

Your datasheet is a simple inductor rather than a transformer. A buck converter normally has an inductor with a single winding.

To find specs for making your own inductor, there are online calculators. You can purchase a ferrite core. Or, a DIY-er might make his own steel-particle slurry by cutting up steel wool and mixing 50-50 with silicone.
 
EP13, ok you download datasheet, choose a ferrite for your switching frequency.
Then you get AL value for it.
Then AL = L(nH)/N^2

Then to check for saturation (Bsat = 300mT)…do

B = (L. Ipk) / (N * Area)

Area is the Amin value, the minimum cross sectional area of the core, given in the datasheet.
You may have to use a gapped core and the right number of turns so you don’t saturate. There may be off the shelf gapped cores in EP13 size…ferroxcube and epcos TDK do them
 

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  • Ferroxcube data handbook 2013.zip
    8.8 MB · Views: 60
  • Epcos Databook 2013.zip
    8 MB · Views: 56
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