ST's MDmesh??? M6 technology improves efficiency in LLC resonant half-bridge converters

This paper compares the performance of ST's latest high-voltage MDmesh(TM) M6 series MOSFETs with leading competitor devices using an open-loop LLC resonant half-bridge converter as the test vehicle. The comparison regards system power efficiency, device switching losses and thermal characteristics. We also examine COSS capacitance more closely, as it plays an important role in LLC resonant converters, especially at zero and light load. For this analysis, the energy storage (EOSS) value given in the datasheets was used to better determine the switching losses at light load.