Product category:
Power Supply ICs and Controllers
News Release from: ON Semiconductor | Subject: ATX power supply reference design
Edited by the Electronicstalk Editorial
Team on 20 April 2007
Power supply meets new Energy Star
guidelines
A power supply reference design exceeds the newest Energy Star requirements and provides a blueprint for efficient power supplies built around available, cost-effective technology.
On Semiconductor has announced a reference design that meets the new Energy Star performance requirements for ATX power supplies used in desktop PCs scheduled to take effect this July The new reference design delivers efficiency that exceeds the Energy Star requirements under all specified load conditions, and provides a blueprint for power-supply manufacturers to bring highly efficient power supplies to market with readily available, cost-effective technology
This article was originally published on Electronicstalk on 31 Mar 2003 at 8.00am (UK)
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"On Semiconductor has clearly demonstrated that it is both technologically possible and financially feasible to deploy highly efficient ATX power supplies to the market today", says Andrew Fanara, Director of Energy Star Product Development at the US Environmental Protection Agency.
"The availability of this open reference design prior to the effective date of the new Energy Star requirements for ATX power supplies has very positive implications for energy savings in the desktop PC market".
On Semiconductor's reference design achieves full-load efficiency of 86.5% at high-line and 82.5% efficiency at 20% of load and low-line.
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This reduces power losses by approximately 50%, compared to the typical power supplies on the market today that average 70% power efficiency.
Additionally, On Semiconductor's ATX reference design meets IEC61000-3-2 power factor requirements.
"On Semiconductor's 300 W GreenPoint ATX reference design demonstrates our unwavering commitment to deliver innovative, turn-key power solutions for extremely efficient power supplies", says Andy Williams, Senior Vice President and General Manager of On Semiconductor's Automotive and Power Regulation Group.
"We worked closely with worldwide regulatory organisations and our customers to develop this cost-effective Energy Star compliant power supply solution".
"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 makes use of several of On Semiconductor'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, bill-of-materials, Gerber files and evaluation guidelines.
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 lead-free 8-lead SOIC and PDIP packages, the NCP1653 is priced at US $0.80 in 2,500-unit quantities.
NCP1562 - This active-clamp pulse width modulation (PWM) voltage-mode controller has a +/-5% 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 lead-free 16-lead TSSOP and SOIC packages, the NCP1562 is priced at $1.60 per unit in 2,500-unit quantities.
NCP1027 - This high-voltage switcher includes a power MOSFET together with a startup 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 lead-free 8-pin PDIP package, the NCP1027 is priced at $0.97 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 lead-free 8-pin SOIC package, the NCP4330 is priced at $0.60 per unit in 2,500-unit quantities.
MSR860 - This 8A, 600V power rectifier has switch-mode soft recovery.
Offered in a lead-free TO-220 package, the MSR860 is priced at $1.07 per unit in 50-unit quantities.
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