This application note presents the simulation and experimental test results on a single-phase synchronous buck converter, highlighting the power MOSFET gate driving voltage impact on converter power management and switching behavior.
The document examines how different power MOSFET gate driving voltages affect the performance of single-phase synchronous buck converters. It highlights that while desktop applications often require 10 V to minimize conduction losses, mobile segments may utilize 5 V due to supply rail availability.
Through OrCAD simulations and bench tests on a demonstration board operating at 300 kHz with up to 20 A output current, the note evaluates phase node spikes, rise times, and overall efficiency. The analysis demonstrates that optimizing gate voltage is critical for managing thermal performance and ensuring reliability under high load conditions.
Desktop applications typically need 10 V as the power MOSFET gate driving voltage to minimize conduction losses.
In the mobile segment, a 5 V power MOSFET gate-source voltage choice is used due to 5 V supply rail availability.