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Old 22nd June 2007, 06:27 AM   #1
jarthel is offline jarthel  Australia
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Default transformer for SMPS

I was reading a scientific magazine and there is a Q&A section.

It was mentioned there than switchmode supplies does not need big (i.e. traditional) transformers. I believe this is true as laptop power supplies can deliver a lot of current in such a small footprint.

my question is: can someone point me to link to transformer suitable for SMPS?

Thank you very much
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Old 22nd June 2007, 10:11 AM   #2
Khron is offline Khron  Finland
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It's not exactly that simple. The (ferrite) core needed for an SMPS depends on what power / voltage(s) / current you need at the output.

Ferrite cores are made in different shapes and sizes, each for a certain range of powers (and switching frequencies).

A website that may help you is http://schmidt-walter.fbe.fh-darmsta..._e/smps_e.html
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Old 22nd June 2007, 02:17 PM   #3
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Originally posted by Khron
A website that may help you is http://schmidt-walter.fbe.fh-darmsta..._e/smps_e.html

That website will suggest you to design useless oversized transformer. For something real, you may want to read this
application note --->

or you can visit They do have a lot of information about ferrite.
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