Product category:
Discrete Power Devices
News Release from: International Rectifier | Subject: IRF6662 and IRF6668
Edited by the Electronicstalk Editorial
Team on 18 November 2005
MOSFETs cut power system losses
New power MOSFETs reduce system-level power loss as much as 10% compared with "enhanced SO-8" devices in medium power 200W DC/DC bus convertor applications.
International Rectifier has introduced two DirectFET power MOSFETs that reduce system-level power loss as much as 10% compared with "enhanced SO-8" devices in medium power 200W DC/DC bus convertor applications commonly found in networking and communications systems 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 convertors
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The IRF6668 and IRF6662 can be used with IR's low voltage DirectFET MOSFETs and DC bus convertor control ICs to create a complete and optimised chip set solution for medium-power isolated bus convertors.
When the IRF6662 or IRF6668 are used on the primary side of an unregulated 48V input, 8V output, 200W isolated convertor the power density of 97W/in2 can be increased an additional 15%.
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% reduction in device on-resistance compared with competing enhanced SO-8 MOSFETs and a 30% better performance figure-of-merit for combined on-state resistance and gate charge compared with competing enhanced SO-8 devices in 36-75V input, 8V output, 200W, 220kHz half-bridge DC bus convertor.
The 80V IRF6668 has 10% better on-state resistance and 30% better total gate charge, resulting in a 40% better performance figure-of-merit for combined on-state resistance and gate charge compared with competing enhanced SO-8 MOSFETs, enabling up to 10% additional output current in 48V input, 8V output, 200W, 220kHz half-bridge DC bus convertor.
The new DirectFET MOSFETs can be used in either half-bridge DC bus topologies with the IR2085S or in full-bridge DC bus topologies with IR2086S, coupled with secondary-side low voltage DirectFET MOSFETs like the IRF6635 for a complete, high efficiency solution.
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