Equipment and Materials ♦ news digest
providing 120V AC from the 3 phase/208V line to neutral, server power supplies will now be expected to accept a broader universal line voltage range of 90V – 305V (277V plus a 10 percent guard band) directly from the 3 phase/480V line to neutral. This architecture eliminates the need for the step-down power transformer, along with the related energy losses and expense.
Optimal operation of server power supplies with a higher input voltage range of 90V – 305V requires power components such as Schottky diodes that have an extended maximum blocking voltage of 650V. Cree’s new 650V-rated devices provide an ideal solution for designers of state of the art power supplies for data center servers and communications equipment.
Cree’s new Z-Rec silicon carbide diodes not only feature the 650V blocking voltage needed for these advanced power supplies, but they also further reduce energy losses, as compared to silicon devices, by eliminating reverse recovery losses.
“Silicon carbide technology is critical to developing the next generation of advanced, energy-efficient data center power system designs because it virtually eliminates diode switching losses,” explained Cengiz Balkas, Cree VP and General Manager, Power and RF. “Conventional silicon devices’ switching losses are known to be big contributors to energy inefficiency, so replacing them with SiC devices can boost the efficiency of the power factor correction stage of the power supply by up to 2 percent, resulting in even greater overall efficiency improvement than with architectural changes alone.”
The initial products in the 650V Z-Rec Schottky diode family, the C3DXX065A Series, include 4, 6, 8, and 10 amp versions in TO-220-2 packages. All devices are rated for operation from -55°C to +175°C.
The C3DXX065A Series devices are fully qualified and released for production use.
Cree is a market-leading innovator of semiconductor solutions for wireless and power applications, lighting-class LEDs, and LED lighting solutions. Cree’s product families include power- switching devices and radio-frequency/wireless devices, blue and green LED chips, high-brightness
LEDs, lighting-class power LEDs, and LED fixtures and bulbs. Cree solutions are driving improvements in applications such as variable-speed motors, wireless communications, general illumination, backlighting and electronic signs and signals.
Equipment and Materials Praxair CEO to Present at
Barclays Conference
Praxair’s growth strategies and business outlook will be discussed.
Stephen F. Angel, chairman, president and CEO of Praxair, will address the Barclays Capital Industrial Select Conference in Miami, Florida on Wednesday, February 9, at 10:40 am ET.
Angel will discuss Praxair’s growth strategies and business outlook.
An audio webcast and presentation will be available on Praxair’s web site at
www.praxair. com/investors A replay will also be available on the website after the presentation.
Praxair produces, sells and distributes atmospheric, process and specialty gases used to grow compound semiconductor materials.
University in Istanbul orders Lithography System from Vistec
The electron-beam system has been developed to meet the diverse requirements for advanced nano- lithography applications in direct write for both R&D and production of GaAs devices.
January / February 2011
www.compoundsemiconductor.net 163
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