Analysis of Switching-Loss-Reduction Methods for MHz-Switching Buck Converters

Numbers of switching-loss-reduction methods recently proposed for MHz-switching buck converters are thoroughly investigated. From a theoretical perspective, switching loss is found to be effectively minimized by adapting the width rather than the turn-on voltage of power transistors of a buck converter. From a practical point of view, the advantage of adapting the width of power transistors becomes diminished. The amount of switching loss minimized by adapting the width of power transistors is also found to be reduced and approached to that minimized by adapting the turn-on voltage of power transistors as technology to fabricate the buck converters is continuously down scaled.