There are two graphs posted on all the datasheets; in the graphs are three lines in three colors, green, blue and red. These lines plot data recorded on the: lowest inductor value in green, the mid range inductor value in blue, and the highest value inductor is shown in red. Designers will deduce similar behavior for inductor values in the “in between” inductance range. In the upper graph; the inductance drop is due to DC bias current and its effect on magnetic flux density. Beyond the maximum flux density point, the permeability of the core is reduced and the inductance drops significantly. There are two ways to look at the current rating of power inductors: the rated current based on self temperature rise, showing the rated current using the heat rise generation by the component as the index; and the rated current based on a set percentage drop in inductance value, showing the rated current at a set decrease inductance value relative to the initial inductance.