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Power MOSFET promises 95 per cent efficiency

Posted: 07 Nov 2006     Print Version  Bookmark and Share

Keywords:power MOSFET  International Rectifier  HEXFET  DirectFET  power MOSFETs 

International Rectifier has released a power MOSFET called the IRF6641TRPBF which is a 200V HEXFET that uses DirectFET package technology and promises an efficiency of up to 95 per cent.

According to Carl Blake, director of technical marketing for discrete products, IR's new DirectFET MOSFET achieves a current rating up to 25A in a footprint the size of an SO-8 with only a 0.7mm profile, while "minimising gate charge and package inductance to reduce both conduction and switching losses." "The board space savings alone of one DirectFET MOSFET versus two or three SO-8 devices is more than 50 per cent," Blake added.

The device, designed for use in isolated DC/DC converter designs operating from a universal input range (36-75V), has a typical on-resistance of 51 mΩ at VDS = 10 and reduced gate charge (QG =35nC typical, QGD = 9.5nC typical) for synchronous rectifier applications in high-frequency, high-current converters for intermediate bus converters, DC motor drives and 48V inverters used with wind turbines. It is also suitable for synchronous rectification in high current AC/DC converters for powering computers and telecom servers operating from a 48V input.

IR said that compared to the in-circuit efficiency of the IRF6641TRPBF to other enhanced SO-8 devices in secondary-side synchronous rectification sockets, its new DirectFET device delivers an improvement of efficiency of 0.4 per cent. Additionally, the device provides the same 7A, full-load efficiency when the same numbers of enhanced SO-8 devices are doubled-up at each socket. In this example, the MOSFET temperatures are lowest in the circuit using two IRF6641TRPBFs.

The device has a common MZ footprint allowing an easy migration path to other mid-voltage DirectFET MOSFETs such as the company's lower-voltage, 100V IRF6662 device in applications where the current levels increase and lower voltage is acceptable.

The IRF6641TRPbF, shipped in tape and reel, is priced at Rs.57.30 ($1.24) each in 10,000-unit quantities. Prices are subject to change.

- Vince Biancomano

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