Effectiveness of fast recovery MOSFETs to reliability of switching power supplies

Several topologies for distributed power systems have been introduced to reduce power losses and device stress on the power devices while achieving high power density. Among them, resonant converters are very suitable for these applications since its performance delivers increased power efficiency, minimized components count and reduced EMI over previous power supply topologies. Furthermore, a synchronous rectification becomes essential building block in output stage of converters. Both LLC resonant converters and synchronous rectifiers utilize body diode of MOSFET during dead time. However, use of body diode of MOSFET in these applications can lead to system failures. An enhanced FRFET^®, power MOSFET with fast recovery body diode, provides higher reliability at the same performance.