The conduction loss of high-side MOSFET is determined by the on-resistances of the MOSFET and the transistor RMS current.ĭead-time loss is induced by LMOS body diode conduction during dead-times.įigure 9. LMOS (Low-Side MOSFET) summarizes to include : conduction, dead-time and reverse recovery charge loss. HMOS (High-Side MOSFET) summarizes to include : switching on & off and conduction loss. The application note introduces and provides how to calculate the majority of power losses in a typical synchronous buck converter occur in the following components based on that the converter works in continuous conduction mode (CCM) fixed switching frequency, fixed input voltage and fixed output voltage. Low-power loss and highly efficient synchronous buck converters are in great demand for advanced micro-processors. The major power losses in synchronous buck converter circuit are listed as bellow : Figure1 shows the general single phase synchronous buck converter circuit. To realize the power loss in converters is important for converter design optimization. The application note introduces the analysis of buck converter efficiency and realizes major power component loss in synchronous buck converter. To realize the power loss of synchronous buck converter and to improve efficiency is important for power designer. The synchronous buck circuit is wildly used to provide non-isolated power for low voltage and high current supply to system chip.
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