Finally, the variation in the boost power MOSFET peak power requirement will be considered. In this case, a 55 uH inductor for operation at 250 kHz is specified. This small value inductor helps minimize inductor size and loss. Three conditions are examined here, nominal high line condition of 220 Volts AC at 1 kW output, the same load at 90 Volts AC input voltage, and during a 75 Volts AC brown out with surge recovery. The losses are calculated assuming a CoolMOS C3 SPWA47N60C3 boost MOSFET which is a 47 ampere device. At 220 VAC, the peak conduction losses, due to the low inductor current and low transformation ratio input to output, are quite low– calculated at under 2 watts. At 90 Volts AC input, the current rises substantially and due to the loss being proportional to the square of the current is now calculated at 28 watts peak. In worst case boundary condition, with 75 Volts AC brown out operation, the loss rises to almost 90 watts. These calculations show why wide input range PFC requires robust semiconductor components to handle worst case conditions.