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A buck regulator uses an inductor to store energy as the current ramps when the FET is turned on. The inductor transfers the energy to the load when the FET is turned off. The output voltage is less than or equal to the input voltage and it is regulated by the pulse width modulation feedback loop. For a boost regulator the current does not flow continuously to the output. When the FET is on, the diode voltage is reverse biased and the output end of the inductor is switched to ground. When the FET is off the output end swings positive and the diode is forward biased and a positive output voltage is produced. The voltage is equal to or higher than the input voltage. By connecting the inductor windings in parallel, the copper conductor area is doubled and the DC resistance is four times lower, providing higher current handling ability with lower losses in the power inductor. The HM78D-1210 series features an inductance range from 4.7 to 470 µH, saturation current ratings to 18 A and energy storage to 500 µJ/cm3.
