With a vast and growing number of RoHS compliant power inductor technologies, we manufacture and design optimum inductive solutions for various requirements and applications. Select the power inductor construction type below to access product-centric information, such as data sheets, package sizes, inductance and more.
Designers have a great deal of construction choices when it comes to selecting a power inductor, including toroidal, flat coil, molded, planar, power bead, drum core and several others.
The inductor can only hold a finite amount of energy before the ferromagnetic material will saturate, the inductance decreases, and ripple current increases. When making an inductor selection, it is important to check that the current at which the core saturates (Isat) is greater than the application’s peak inductor current, (Ipk = Iout + Iripple/2). Basically, the temperature of the inductor will rise due to dissipated losses so the designer needs to consider copper loss and core loss.
After the application requirements have identified the optimum power inductor winding technology, the next (and perhaps final) step is to select the size that can provide the correct characteristics while also being geometrically suitable for the application.
The use of ferromagnetic material as the inductor core allows energy to be stored in the inductor. When a positive voltage is dropped across the inductor, the current increases and energy is added to the inductor. It is these fundamental characteristics that make the inductor useful in the dc/dc converter, since it acts as both a current-ripple filter and an energy-storage element. When the switch is closed, current flowing to the load increases and energy is also stored in the inductor.
The practical power inductor consists of a wound conductor coil on a ferromagnetic material. This combination yields an inductance (L) that offers a reluctance to a change in current, and therefore the current through an inductor cannot change instantaneously. The rate of change of current through an inductor (dI/dT) is determined by the inductance and the voltage dropped across the inductor, given by the expression: V = L*dI/dT.
As there are a diverse range of power converter requirements supplying a wide range of power levels at a multiplicity of voltages and currents, there is also a wide range of inductance and current requirements...making inductor selection a sometimes difficult task.