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IR's DirectFET power MOSFETs reduce system-level power loss

Posted: 11 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:international rectifier? ir? directfet? mosfet? irf6668?

International Rectifier (IR) unveiled two DirectFET power MOSFETs promise to reduce system-level power loss as much as 10 percent versus "enhanced SO-8" devices in medium power 200W DC/DC bus converter applications commonly found in networking and communications systems. According to the press release, the low combined on-state resistance and gate charge makes the new IRF6668 80V and IRF6662 100V DirectFET MOSFETs ideal primary-side power switches for high efficiency isolated DC/DC bus converters.

"Isolated DC/DC bus converters power today's ASICs, NPUs and FPGAs in advanced networking and communications systems. The IRF6668 and IRF6662 can be used with IR's low voltage DirectFET MOSFETs and DC bus converter control ICs to create a complete and optimized chipset solution for medium-power isolated bus converters," said Carl Smith, marketing manager for IR's networking and telecommunication products.

When the IRF6662 or IRF6668 are used on the primary side of an unregulated 48V input, 8V output, 200W isolated converter, the power density of 97W/in? can be increased an additional 15 percent. This is enabled by taking advantage of the dual-sided cooling capability of the DirectFET MOSFET packaging technology with the addition of a heatsink.

The 100V IRF6662 has a 4 percent reduction in device on-resistance compared to competing enhanced SO-8 MOSFETs and a 30 percent better performance figure-of-merit for combined on-state resistance and gate charge compared to competing enhanced SO-8 devicesin 36V to 75V input, 8V output, 200W, 220kHz half-bridge DC bus converter.

Meanwhile, the 80V IRF6668 has 10 percent better on-state resistance and 30% better total gate charge, resulting in a 40 percent etter performance figure-of-merit for combined on-state resistance and gate charge compared to competing enhanced SO-8 MOSFETs, enabling up to 10 percent additional output current in 48V input, 8V output, 200W, 220kHz half-bridge DC bus converter.

The 100V IRF6662 and the 80V IRF6668 DirectFET MOSFETs are available immediately. Pricing is 99 cents each for either device, both in 10,000-unit quantities. Prices are subject to change.




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