Fairchild Semiconductor's Integrated PFC Controller Reduces Power Loss up to 320mW and Eliminates Components in Under 250W Power Supply Designs; FAN7528 Helps Applications Designers Meet Energy-Efficiency Regulations.

SOUTH PORTLAND, Maine -- To meet the stringent green standards confronting today's design engineers, Fairchild Semiconductor (NYSE:FCS) introduces a power factor correction (PFC) controller IC that reduces standby power as much as 320mW in switch-mode power supply (SMPS) designs under 250 Watts, such as notebook adaptors. In addition to dramatically increasing energy efficiency, the highly integrated FAN7528 saves board space by reducing component count.

The FAN7528 is an active PFC controller that operates in critical conduction mode (CRM). Unlike conventional current-mode CRM PFC controllers, the FAN7528 integrates a dual-output control function to increase efficiency with a universal AC input. This integrated feature renders the sensing of the rectified AC line voltage for power factor correction unnecessary, leading to a pronounced drop in standby power in certain adaptor applications, as compared to similar devices.

"Engineers designing power supply adaptors must adhere to a number of energy-efficiency standards such as Energy2000, Blue Angel and the EU Code of Conduct," said CJ Kim, Fairchild's Power Supply Product Line Manager. "Fairchild designed the FAN7528 to automatically sense AC line voltage by integrating dual-output control. In addition to offering a dramatic efficiency improvement, this integration helps designers eliminate discrete components."

With its ability to eliminate an input voltage-sensing network, the FAN7528 cuts system power loss to 80mW compared to alternative controllers that need to sense input voltage. In addition to low power consumption, the FAN7528 integrates an open-feedback disable function (65 microamps) for excellent system protection against damaging power surges. To further increase power efficiency, Fairchild's controller utilizes a patent-pending variable on-time control method utilized to significantly reduce total harmonic distortion (THD).

Key efficiency, space-saving and protection benefits of the FAN7528 include:

--Dual-output voltage control without input voltage sensing, eliminating external components and reducing power loss (80 milliwatts, 2 megohms);

--Patent-pending variable on-time control method resulting in low THD;

--Precise output over-voltage protection (plus/minus 2%);

--Open feedback protection and disable function (65 microamps);

--Low start-up current (typical 40 microamps);

--Low operating current (typical 2.5 milliamps);

--400 milliamps peak gate drive current;

--Internal RC filter for current sensing; and

--Compact 8-DIP and 8-SOP Pb-free packaging.

Fairchild Semiconductor's FAN7528 adds to the industry's most comprehensive product portfolio of AC/DC switch-mode power supply solutions for high-, medium- and low-power applications (1W to 1500W). Additional Fairchild devices targeting the SMPS market include high-voltage gate drivers, SuperFET(TM) and FPS(TM) (Fairchild Power Switch) devices and optocouplers.

The FAN7528 is a lead (Pb)-free product that meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020C and is compliant with the European Union requirements now in effect.

Price (each):                US $1.00 (1000 pcs)
Availability:                Samples and demo board available now
Delivery:                    8 weeks ARO

For more information about this product, go to http://www.fairchildsemi.com/pf/FA/FAN7528.html. For information on other Fairchild products, design tools, and sales contacts, please visit http://www.fairchildsemi.com.

Editor's Note: For a datasheet in PDF format, go to http://www.fairchildsemi.com/ds/FA/FAN7528.pdf.

About Fairchild Semiconductor:

Fairchild Semiconductor (NYSE:FCS) is the leading global supplier of high-performance power products critical to today's leading electronic applications in the computing, communications, consumer, industrial and automotive segments. As The Power Franchise(R), Fairchild offers the industry's broadest portfolio of components that optimize system power. Fairchild's 9,000 employees design, manufacture and market power, analog & mixed signal, interface, logic, and optoelectronics products. Please contact us on the web at www.fairchildsemi.com.