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Power Integrations' LinkSwitch -PH LED Driver ICs Eliminate Electrolytic Capacitors, Exceed 90% Efficiency and 0.9 Power Factor

Reference design leverages single-stage, accurate, offline LED driver technology; maximizes return on investment with high efficiency and long operational lifetime

SAN JOSE, CALIF. – April 20, 2011
– Power Integrations today announced a new reference design (DER-278) based on the company’s single-stage LinkSwitch-PH LED-driver IC family. The new design eliminates the need for unreliable electrolytic capacitors and opto-isolators, making it especially well suited for high-reliability industrial, commercial, and exterior solid-state lighting (SSL) applications. Suitable for designs from 5 W to 55 W, SSL driver ballasts based on LinkSwitch-PH ICs achieve greater than 90% energy efficiency and satisfy the ENERGY STAR requirement of >0.9 power factor.

LED-based lighting systems have the potential for a much longer operational life than incandescent or fluorescent bulbs. However, the classical two-stage topology (i.e., power-factor plus high voltage DC-DC converter), which is sometimes used by manufacturers targeting consumer-grade bulb replacements, utilizes a high-voltage electrolytic bulk capacitor between the stages. The longevity of such systems is limited by the lifetime of the electrolytic capacitor, which tends to dry out and fail, particularly when situated in an enclosed space (e.g., a ballast “brick” or bulb base) and exposed to the heat produced by inefficient two-stage power conversion and proximal high-brightness LEDs. Power Integrations’ efficient, accurate, single-stage, primary-side-control technology, featured in LinkSwitch products, eliminates both the electrolytic capacitor and the also-unreliable optocoupler used in traditional isolated flyback designs. Designers using LinkSwitch-PH ICs for SSL products can expect the operational life of the driver to exceed the 35,000 hours required by the ENERGY STAR SLL (V1.1) specification.

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