![]() ![]() One big advantage appears to be the fact that you can build toroids with an air gap distributed along the entire ring. The main applications appear to be mains frequency input filters and PFC (step-up) stages at low to moderate frequencies, not so much SMPS transformers. I've seen them pretty much exclusively as toroids. Iron powder cores are produced by gluing small iron particles together using epoxy resin or another polymeric glue. ( Wikipedia section about how they're made) Magnetically soft ferrites, as used for today's RF or power applications, are sintered particles of, mostly, MnZn or NiZn compositions. ), a ferrite core or an iron powder core might be the better choice. Depending on what I'm trying to build (RF, power. Most times when I need a small inductor, I try to find the necessary core in my junk box.
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