These 600V MDmesh M2 EP devices combine ST’s strip layout with an improved vertical structure and an optimised diffusion process to approach the ideal switch, with very low ON-resistance and the lowest available turn-off switching losses. They are tailored for very-high-frequency converters (switching frequencies of over 150 kHz), suiting them for the most demanding PSU applications.
Suitable for both hard- and soft-switching topologies, including resonant topologies such as LLC, these devices offer extremely low switching losses, especially under light-load conditions. In addition to the very low gate charge (Qg) – as low as 16 nC – exhibited by all MDmesh M2 devices, the M2 EP devices feature up to a 20% reduction in Eoff (turn-off energy), thus reducing by the same percentage the turn-off switching losses in hard-switching converters. This Eoff reduction in the low current range boosts the efficiency under light-load conditions, where efficiency-certification rules are becoming increasingly demanding. They feature an optimised capacitance profile for light-load conditions, and optimised Vth and Rg values for soft switching.
The enhanced shape of the turn-off waveforms leads to higher efficiency and lower noise in resonant converters, allowing more energy to be stored and re-used, rather than dissipated as heat, cycle by cycle.
In a range of packages (PowerFLAT 5x6 HV, DPAK, D2PAK, TO-220, TO-220FP, I2PAKFP, and TO-247) the MDmesh M2 EP family targets power-supply applications that require the highest efficiency levels. All devices are in full production, with pricing starting at $1.5 for the STD15N60M2-EP in a DPAK package (1000).