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Optoelectronics/Displays??

MOSFETs combine fast switching speeds, low RDS(on) values

Posted: 19 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:royal philips electronics? power mosfet? php33nq20t? ohb33nq20t? php45nq15t?

Royal Philips Electronics introduced a new family of 150V and 200V power MOSFETs targeted for use in backlight inverters for LCD TVs and monitors, and UHP (Ultra High Pressure) discharge lamp inverters for beamers and projection TVs.

Fabricated with the company's TrenchMOS technology, these new devices combine fast switching speeds with low RDS(on) values, thereby reducing switching and DC losses to the very low levels required for high efficiency inverter operation, the press release said.

The CCFL tubes used to backlight large-area LCD displays, and the UHP lamps used in projection TVs and beamers, need to be driven with carefully controlled high-voltage high-frequency AC waveforms in order to provide accurate brightness control without perceivable flicker, explained Philips.

Thus, power MOSFETs are needed to provide the necessary high-speed current switching needed to generate these waveforms, while minimizing conversion losses and thereby easing thermal management problems.

"The ever-larger screen sizes being produced by the LCD and rear projection TV industries require correspondingly higher drive power for their backlighting," added Manuel Frade, GM for Philips' power management business. "That makes it increasingly important to minimize power losses in the drive electronics."

The initial power MOSFETs range is comprised of 200V devices with an RDS(on) value of 65 milliohms and 150V devices with an RDS(on) value of 34 milliohms, all of which are housed in industry standard TO220 or D2PAK packages. The PHP33NQ20T, PHB33NQ20T, PHP45NQ15T and PHB45NQ15T MOSFETs are available in quantities of 10,000 units.




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