Power Integrations IC Simplifies Replacement of Linear Transformers in Chargers/Adapters Below 4 Watts

May 11, 2004
Optimized for Bias Winding Feedback, the LinkSwitch® LNK520 Also Reduces EMI


SAN JOSE, Calif. - May 11, 2004 - Power Integrations (NASDAQ: POWI), a pioneer of integrated circuits for energy efficient power conversion, announced today the availability of the LNK520, a new member of its LinkSwitch family, further simplifying the design of low cost off-line switching power supplies for applications under 4 watts. The new product enables the replacement of bulky, energy-wasting linear transformers in battery chargers and adapters currently used in a wide range of electronic applications.

The LNK520, a high-voltage monolithic power conversion IC, has been optimized for constant voltage, constant current (CV/CC) operation using primary side bias winding feedback. Switching characteristics have also been optimized to reduce electro-magnetic interference (EMI), simplifying the external filter component design needed to meet EMI standards. Additional benefits of a LNK520 power supply design include smaller size, lighter weight, superior performance, and significantly higher energy efficiency than linear transformer and RCC switching chargers and adapters. The LNK520 is available in both through-hole and surface mount DIP packages.

The LNK520 cost effectively combines a 700-volt power MOSFET, PWM controller, high voltage start-up, current limit, and thermal shutdown circuitry onto a single CMOS chip. Requiring only three terminals, it includes a number of built-in features including auto-restart for short circuit and open loop fault protection and the company's EcoSmart® technology. EcoSmart dramatically reduces the energy consumption of the power supply during standby and "no-load" conditions, allowing engineers to design converters that meet government energy guidelines such as Energy Star, Blue Angel, the EC Code of Conduct, and all other energy standards worldwide.

The LNK520 enables a fault protected, universal input (85 VAC to 265 VAC), constant voltage or constant voltage, constant current output switching power supply with under 300 mW no-load power consumption, while eliminating the requirement of an opto-coupler and secondary feedback circuitry. Optimized for a primary "low-side" placement in the power supply circuit where switching noise and EMI emissions are much lower, the LNK520 delivers a low cost solution using a small transformer that is easier to design and produce.

Applications for the LNK520 include linear transformer replacement in adapters and battery chargers for a wide range of personal electronics (cell phones, cordless phones, PDAs, digital cameras, MP3 players, shavers), home appliances, television standby, and other auxiliary power supplies.

The LNK520 is supported by a number of design tools including a 20-page data sheet, a Design Guide application note (AN-35), a tested Design Idea circuit (DI-75), and the company's power supply design software program, PI Expert, all downloadable from the Power Integrations website. A Design Accelerator Kit (DAK-54) containing two operational 2.75 W universal input AC-DC adapters, product samples, an engineering report (EPR-54), and other collateral is also available.

Pricing for the LNK520P, housed in a plastic DIP-8 package, is $0.35 each in 10,000 piece quantities. Production quantities are available 4 weeks ARO. The DAK-54 is available from the company's distributors for $19.95 each.

Power Integrations is a leading supplier of high-voltage analog integrated circuits for use in power conversion. For more information, contact the company at 5245 Hellyer Avenue, San Jose, California 95138, PH: (408) 414-9665 or visit the company's web site at www.powerint.com. For information on meeting energy regulations, visit the PI Green Room at www.powerint.com/greenroom;.

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