AN-1001 Datasheet, PDF (1/4 Pages) International Rectifier – Application Note

Application Note AN-1001
A More Realistic Characterization of Power
MOSFET Output Capacitance Coss
Table of Contents
1. Introduction ..................................................................................................... 1
Power MOSFETs and switching frequency ................................................ 1
Hard switching and power dissipation ........................................................ 1
Coss effective............................................................................................. 1
Coss at 80% Vdss...................................................................................... 2
2. Summary & Conclusion ................................................................................. 3
Previously, energy loss through output capacitance in MOSFETs has been deemed insignificant.
However, as frequency increases, and application topologies change, this capacitance becomes
more important. This paper shows a meaningful way to calculate this parameter and how it
contributes to energy loss.