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Power Integrations addresses solid-state lighting apps

Posted: 26 Sep 2005     Print Version  Bookmark and Share

Keywords:power integrations  led  driver circuit  di-92  lnk302 

Power Integrations (PI) announced the latest application of its power conversion technology, unveiling a low component count driver circuit for off-line LED lighting. According to the press release, the circuit requires only nine components to deliver 40mA of current and 0.5W of output power—an ideal level for emergency exit signs, nightlights and a variety of other lighting applications.

"Solid-state lighting is gaining popularity in applications where long lifetimes and low maintenance are important," said Rich Fassler, director of product marketing for PI. "Another key benefit of LED lighting is energy efficiency, which makes our EcoSmart power conversion technology a natural fit for this market. As the efficiency of solid-state technology increases over time, LEDs will find applications in the general lighting market, presenting an even greater opportunity for our energy-efficient power conversion ICs."

The design, entitled DI-92, utilizes LNK302, a member of PI's LinkSwitch-TN family of ICs. The DI-92 is a constant-current LED driver circuit using a non-isolated buck-boost topology. The design's low component count makes it extremely small, lightweight and inexpensive, added PI, with a materials cost of approximately 50 cents (in unit quantities of 10,000). The circuit is also environmentally friendly, operating at up to 75 percent efficiency

The DI-92 circuit design operates across the entire global range of AC input voltages, from 85V to 265V. It meets EMI specifications CISPR22B/EN55022B with a margin of more than 8dB, and is Class II safety-compliant.

DI-92 is available for download from the Design Examples page of the company's website.

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