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On Semi unveils Energy Star-compliant ATX ref design

Posted: 30 Apr 2007     Print Version  Bookmark and Share

Keywords:ATX reference design  Energy Star requirements  ATX power supplies 

ON Semiconductor has launched an open ATX reference design having an efficiency that exceeds the Energy Star requirements under all specified load conditions, and provides a blueprint for power supply manufacturers to bring efficient power supplies to market with available, cost-effective technology. The company claims the reference design to be the first in the industry to meet the new Energy Star performance requirements for ATX power supplies used in desktop PCs scheduled to take effect this July.

50 per cent less power losses
The ATX reference design achieves full-load efficiency of 86.5 per cent at high-line and 82.5 per cent efficiency at 20 per cent of load and low-line. This reduces power losses by approximately 50 per cent, compared to the typical power supplies on the market today that average 70-per cent power efficiency. The reference design also meets IEC61000-3-2 power factor requirements.

"We worked closely with worldwide regulatory organisations and our customers to develop this cost-effective Energy Star-compliant power supply solution," said Andy Williams, senior VP and general manager of ON Semiconductor's automotive and power regulation group. "ON Semiconductor will continue to introduce additional GreenPoint power solutions addressing the global need for power efficiency in both active and standby modes."

The reference design addresses all functional blocks of the ATX power supply, including power factor correction, switch-mode power supply control and regulation, post regulation and standby power. The design utilises several of the company's newest power management devices and draws from its leading discrete component portfolio to achieve superior efficiency performance.

ON Semiconductor has a complete documentation package for the ATX reference design, including description, schematics, BOM, Gerber files and evaluation guidelines.

Key products
Key products in the reference design include:

NCP1653: This compact continuous conduction mode (CCM) power factor correction (PFC) controller makes the choice of incorporating a PFC front-end into an ATX design easy, by reducing part count and providing a robust, cost-effective front-end without range switches. Offered in Pb-free 8-lead SOIC and PDIP packages, the NCP1653 is priced at Rs.35.20 (80 cents) in 2,500-unit quantities.

NCP1562: This active-clamp pulse width modulation (PWM) voltage-mode controller has a ?5 per cent duty cycle limit with a soft-stop to prevent the typical oscillations in the forward active-clamp topology. The device has a dual-mode over-current protection circuit that handles momentary and continuous over-current conditions differently. Offered in Pb-free 16-lead TSSOP and SOIC packages, the NCP1562 is priced at Rs.70.40 ($1.60) per unit in 2,500-unit quantities.

NCP1027: This high-voltage switcher includes a power MOSFET together with a start-up current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown-out circuitry blocks the activity until sufficient input level is reached. Offered in a Pb-free 8-pin PDIP package, the NCP1027 is priced at Rs.42.68 (97 cents) per unit in 1,000-unit quantities.

NCP4330: This synchronous post-regulator replaces the mag-amp to provide higher efficiency in the output section of the ATX power supply. Offered in a Pb-free 8-pin SOIC package, the NCP4330 is priced at Rs.26.40 (60 cents) per unit in 2,500-unit quantities.

MSR860: This 8A, 600V power rectifier features SWITCHMODE soft recovery. Offered in a Pb-free TO-220 package, the MSR860 is priced at Rs.47.08 ($1.07) per unit in 50-unit quantities.




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