![]() ![]() I use their cores all the time and they have step by step guides for designing inductors and such. You always want to calculate your required inductance at the worst case scenario (full 2A, switching frequency, a little margin).ĭo yourself a favor and check out Magnectics Inc. Frequency graph from the core datasheet is fairly flat. I think your primary concern is going to be switching frequency, so just make sure the Permeability Vs. ![]() In this instance, you may do 50 turns for 4.4mH so that when you get to full DC bias you are still above the 2.2mH goal.Īt a maximum of 2A, DC Bias probably won't affect you much, but it is something to look out for. Others will fall off like a rock! You may have 2.2mH with 23 turns at first, but when you lose 20-30% of that perm (look at the graphs, some cores can lose over 50-60%!) you will not have enough inductance. Some materials have an excellent DC bias and you can put tons of amps through them and only lose ~20% of your initial perm. If you're using a company such as Mag Inc, Ferrox, TDK EPCOS or the like, they will have plenty of graphs showing you these property curves. ![]() Switching frequency, DC bias, and even temperature affect the permeability of a core. As Tim said, everything matters! There are even a few points that the other two answers have missed. ![]()
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