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ST's high-voltage MOSFETS meet green standards

Posted: 12 Sep 2012     Print Version  Bookmark and Share

Keywords:power  MOSFETs  green 

STMicroelectronics introduces SuperMESH 5 power MOSFETs that claim to deliver the industry's best efficiency at 900V, the highest voltage rating at 950V, and 850V devices in the PowerFLAT 8x8 HV package. The devices are equipped with super-junction technology, enabling them 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.

 SuperMESH 5 power MOSFETs

The MOSFETs are 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 64mm2, which is 56 per cent smaller than the industry-standard D2PAK package. In addition, its mounted height of 1mm is 77 per cent lower than D2PAK allowing use in ultra-slim designs.

For the 900V STP21N90K5, the figure of merit is 62.5 per cent better than the only comparable alternative device in the market. This enables designers to achieve an appreciable efficiency increase simply by using the STP21N90K5 rather than the competing device.

The high voltage rating of ST's new 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 microinverters and charging points for electric vehicles. Charging points require very high power-conversion efficiency both to minimise charge time and vehicle running costs. In DC/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.

Green compliance
The MOSFETs are said to enable designers to meet increasingly strict limits on maximum power and minimum energy efficiency specified by eco-design standards such the Energy Star ver. 5.3 for televisions which specifies an absolute maximum power limit of 108W for 50inch or larger flat-screen televisions. Also, the lighting regulations in EU's Energy-related Products (ErP) Directive demand increases in the minimum efficacy of various types of HID lamps between 2012 and 2017.

The first successful customer application of one of the MOSFETs is the use of the 950V STU6N95K5 in IPAK package as the main power switch in Italian solid-state lighting maker TCI's latest LED drivers for LED lamps that offer energy efficiency in a physically compact and cost-effective form factor. Other applications of the MOSFETs include FPDs, PC power supplies, and electronic ballasts for High-Intensity Discharge (HID) lamps.

The SuperMESH 5 devices are available immediately for sample or production orders, priced from Rs.194.44 ($3.50) to Rs.555.56 ($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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