![]() The D and E dimensions in the reference are actually C and D in the datasheet, and the A dimension will be (E-D-twice the insulation thickness)/2 if the winding window is full, or it'll be just half the depth of the winding layers if it's less than full.Īdd these segments together, and you'll get the formula in your reference. The first wind has four sides, each the length of the core center pin size pluse twice the insulation thickness, and four corners, which are each the length of a 90 degree arc struck around the corner, remembering that the mean diameter is halfway out - the "A" dimension. ![]() C PAR, L BEAD, and R AC are (respectively) the parasitic capacitance, the bead inductance, and the ac resistance (ac core losses) associated with the bead. R DC corresponds to the dc resistance of the bead. You'll have to calculate the MLT yourself, based on the core geometry, the bobbin or insulation you wind it on, and the window fill - the amount of copper wire you're putting in, so it isn't a constant for a given core.įor a cylindrical wind, this is fairly easy, since it's just the length of the winding halfway out of the hollow cylinder formed by the winding.įor a rectangular core, you have to break the coil down into geometric segments. A ferrite bead can be modeled as a simplified circuit consisting of resistors, an inductor, and a capacitor, as shown in Figure 1a. ![]()
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