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600V power MOSFETs promise low switching loss

Posted: 28 Aug 2015 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? MOSFET? power supply? PSU?

STMicroelectronics has announced a line-up of devices that promises to deliver the industry's highest power efficiencies in power supplies for servers, laptops, telecom and consumer applications, especially under light-load conditions. The devices are extensions of the company's MDmesh M2 series of N-channel power MOSFETs.

With these devices, designers can create switching power conversion solutions that are lighter and more compact, while more easily meeting increasingly stringent energy-efficiency targets.

The 600V MDmesh M2 EP devices combine ST's proven 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, noted ST. They are tailored for very-high-frequency converters (f> 150kHz), making them perfect for the most demanding power supply unit (PSU) applications, said ST.

MDmesh M2 EP devices

Geared for both hard- and soft-switching topologies, including resonant topologies such as LLC, the devices offer extremely low switching losses, especially under light-load conditions, indicated the company. In addition to the very low gate charge (Qg) exhibited by all MDmesh M2 devices, the M2 EP devices feature up to a 20 per cent reduction in Eoff (turn-off energy), thus reducing by the same per centage 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.

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.

Key features of the new MDmesh M2 EP series include: extremely low Qg (as low as 16nC); optimised capacitance profile for light-load conditions; optimised Vth and Rg values for soft switching; and body diode ruggedness.

Offered in a range of packages (PowerFLAT 5x6 HV, DPAK, D2PAK, TO-220, TO-220FP, I2PAKFP and TO-247) the MDmesh M2 EP family is in full production, with pricing starting at $1.5 for the STD15N60M2-EP in a DPAK package for orders of 1000 pieces.

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