Fairchild PWM controller saves power and enhances
reliability in off-line and DC:DC conversion applications

Integrated functions include soft-start, ON/OFF control and protection circuitry

Fairchild Semiconductor International is introducing the FAN7554 versatile PWM controller IC for use with power MOSFETs in off-line, DC:DC conversion and other switch-mode power-supply (SMPS) applications, such as those found in desktop computers, monitors and power adapters.

The FAN7554 is a current-mode PWM controller that operates up to 500 kHz. It integrates control and power-savings circuitry to eliminate several external components and reduce system power consumption. Special protection circuitry improves reliability.

For example, a startup current of only 100 (A permits low-power operation until the input threshold voltage is reached. An on/off-control circuit invokes a power-savings mode, drawing only 200 (A instead of 7 mA for normal operation.

Switch-mode power supplies face considerable stress over time, such as rapid duty-cycle ramp ups and current surges. To improve reliability, the FAN7554 incorporates soft-startup circuitry to reduce stress on the outputs and improve its immunity to current surges. The circuit also provides over-voltage protection (OVP), over-current protection (OCP), over-load protection (OLP) and over-current latchup protection (OCLP). This combination of integrated features eliminates external components while reducing the overall system footprint and improving system reliability.

The FAN7554 is available in 8-lead DIP or SOP packages. Pricing begins at US$0.95 each in 1,000-piece quantities. For more information on these and other analogue products, contact the Fairchild Semiconductor Hong Kong office on 852 2722 8338 or visit us at www.fairchildsemi.com.

About Fairchild Semiconductor (www.fairchildsemi.com )
Fairchild Semiconductor International (NYSE: FCS) is a global company solely focused on designing, manufacturing and marketing high-performance semiconductors for multiple end market uses. Fairchild's multi-market components are used in computer, telecommunications, automotive, consumer and industrial applications. Supplying discrete, analogue & mixed signal, interface, logic, and optoelectronics products, Fairchild is filling the gap in the global supply of building block semiconductors. The company is headquartered in South Portland, Maine, USA, with 10,000 employees worldwide. Additional manufacturing facilities are located in Utah, South Korea, China, Singapore, Malaysia and the Philippines, with regional sales offices throughout the world.

Issued by Always Communications on behalf of TechWorks Asia

Annie Ho
Tel: (852) 2855-7819
Fax: (852) 2817-1004
Annieh@agrapha-group.com

TechWorks Asia
Claire Walker/ Dr Gordon Wong
Tel: (852)2524-4956
Claire@techworksasia.com

Fairchild Semiconductor
Terry Leung
Tel: (852) 2722-8338
Terry_leung@fairchildsemi.com