Some choices based upon an LI² value of 6.4 millijoules are: There are many ferrite cores available that will support the energy required.Īny core size that the LI² coordinate intersects can be used at the A L value shown on the chart.ħ. Example: If I MAX = 8 Amps L, inductance required = 100 μHenries Required inductance L, core size, and core nominal inductance (A L) are known.ĥ.

Any core size line that intersects the LI² coordinate represents a workable core for the inductor if the core’s A L value is less than the maximum value obtained on the chart.Ĥ. This represents the smallest core size and maximum A L at which saturation will be avoided.ģ. Read the maximum nominal inductance, A L, on the Y-axis. Locate the LI² value on the Ferrite Core Selector chart below.įollow this coordinate in the intersection with the first core size curve. I = maximum DC output current + 1/2 AC RippleĢ.

L = inductance required with DC bias (millihenries) Only two parameters of the design applications must be known: One can determine the smallest core size, assuming a winding factor of 50% and wire current carrying capacity of 500 circular mils per ampere. These core selection procedures simplify the design of inductors for switching regulator applications. By adding air gaps to these ferrite shapes, the cores can be used efficiently while avoiding saturation. For switching regulators, power materials are recommended because of their temperature and DC bias characteristics. For other inquiries regarding inductor design with Magnetics ferrite cores, Contact our Applications Engineers or submit a Custom Inductor Design request.įerrite E cores and pot cores offer the advantages of decreased cost and low core losses at high frequencies. The following design guide may also be downloaded as a PDF. In this example, the number of turns is 30.Inductor Design with Magnetics Ferrite Cores Next, determine the new number of turns of the inductor.

This value is typically calculated when the inductance at a certain number of turns is known. The following example outlines the steps and information needed to calculate the inductance of a ferrite inductor.įirst, determine the AL value. How to Calculate Inductance of Ferrite Inductor? These inductors have ferrite core that provides them with low electrical conductivity. What is a Ferrite Inductor?įerrite inductors are a type of inductor known for strong electromagnetic properties. To calculate the inductance of a ferrite inductor, divide 100 by the number of turns, squared this result, then divide the AL value by this result.

N is the number of turns of the ferrite core.

AL is the AL value based on the inductance of the ferrite.

Ferrite coil calculator