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Power MOSFETs target emerging co-design standards

Posted: 10 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:power MOSFET? SuperMESH 5? electric vehicle? STx21N90K5? STx20N95K5?

STMicroelectronics has rolled out what it described as line of rugged, high-efficiency power products that enables technology companies to satisfy stricter power and efficiency targets set by eco-design standards. The solutions likewise target green-energy applications such as solar micro-inverters, photovoltaic string inverters and electric vehicles, added the company.

The devices include super-junction transistors (MOSFETs) capable of withstanding peak voltages up to 950V, as well as 900V devices offering best-in-class energy efficiency and the world's only 850V devices to be offered in the ultrathin and space-saving PowerFLAT 8x8 HV package, flaunted ST. Super-junction technology enables MOSFETs to achieve higher operating voltages with very low electrical on-resistance in relation to device size, enabling power supplies to deliver increased system reliability and energy efficiency within compact overall dimensions, the company indicated.

Other high-volume applications for ST's super-junction MOSFETs include flat-panel TVs, PC power supplies, LED lighting drivers and electronic ballasts for high-intensity discharge (HID) lamps. The MOSFETs will enable designers to meet increasingly strict limits on maximum power and minimum energy efficiency specified by eco-design standards such as Energy Star and the EU's Energy-related Products (ErP) Directive.

The high voltage rating of ST's super-junction MOSFETs increases system safety and reliability. This is an important benefit in HID lamp ballasts and other systems operating at AC line voltages and higher such as solar micro-inverters and charging points for electric vehicles. Charging points require very high power-conversion efficiency both to minimize charge time and vehicle running costs. In DC-to-AC inverters for solar micro-generators, high-efficiency, high-voltage MOSFETs enable designers to use higher switching frequencies and so generate high-quality ac power while reducing energy losses and solution size, ST stated.

The MOSFETs are the first in ST's SuperMESH 5 fifth-generation super-junction family. They include the 900V STx21N90K5, 950V STx20N95K5 and 950V STx6N95K5 in various package options. The STL23N85K5 850V variant in the PowerFLAT 8x8 HV high-voltage surface-mount package has a footprint of 64 x 64 mm, claimed to be 56 percent smaller than the industry-standard D2PAK package. In addition, its mounted height of 1mm is 77 percent lower than D2PAK allowing use in ultra-slim designs.

For the 900V STP21N90K5, the Figure of Merit (FOM), which indicates the device's overall energy efficiency when turned on as well as when switching on or off, is 62.5 percent better than the only comparable alternative device in the market, ST revealed. This enables designers to achieve an appreciable efficiency increase simply by using the STP21N90K5 rather than the competing device.

The SuperMESH 5 devices are available immediately for sample or production orders, priced from $3.50 to $10 in quantities of 1,000 units depending on voltage/current rating and package type. Alternative pricing options for larger orders are available on request.

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