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In DC-DC converters, the power inductors is the core element behind the IC. By selecting the appropriate inductor, a higher conversion efficiency can be achieved. So in the choice of inductor when the corresponding inductance of the main parameters: inductance, rated current, size, etc., in these parameters also include the unique concept of the inductor. For example: power inductor rated current there are two, what is the difference between them?

Want to know the difference between them, first of all have to understand the existence of two kinds of rated current reasons of power inductors manufacturers . Power inductor rated current "based on self-temperature rise of the rated current" and "based on the rate of change in the inductance of the rated current" two decision methods, respectively, of great significance. "Rated current based on self-temperature rise" is the rated current requirement of the element's calorific value, which may cause component damage and component failure beyond this range.

At the same time, the "rated current based on the change rate of the inductance value" is the rated current requirement of the decrease in the inductance value, and the IC control may be unstable due to the increase of the ripple current when the range is exceeded. In addition, depending on the magnetic circuit configuration of the inductor, the tendency of magnetic saturation (i.e., the tendency to decrease the inductance value) is different. The figure below shows a change in the inductance value caused by the different magnetic circuit construction. For the open magnetic circuit type, with the increase of DC current, to the specified current value until the show a relatively flat inductance value, but the specified current value for the realm of the sharp decline in inductance. On the contrary, the type of closed magnetic circuit with the DC current increases, the permeability of the value gradually reduced, so the inductance value slowly decreased.

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