Power Integrations' LinkSwitch™-PH Delivers Flicker-Free TRIAC Dimming for LED Downlights

September 6, 2011

New single-stage reference design for PAR38 lamps eliminates high-voltage electrolytic bulk capacitors to extend product lifetime

SAN JOSE, Calif.--(BUSINESS WIRE)-- Power Integrations (Nasdaq:POWI), the leader in high-voltage integrated circuits for LED lighting, today introduced a new reference design (DER-281) detailing an 85%-efficient, 15 W PAR38 downlight driver that delivers flicker-free dimming without the use of unreliable high-voltage electrolytic bulk capacitors. Based on Power Integrations' LNK405EG, a member of the company's popular LinkSwitch-PH family of LED driver ICs, the design's novel approach to dimming eliminates the need to sacrifice reliability and efficiency in order to achieve flicker-free performance across a broad range of TRIAC dimmers.

Typical TRIAC dimmers were designed for incandescent lights that use an order of magnitude more power than LED lights of equivalent lumen output. The low current requirement of LED lights, especially when dimmed, can cause TRIACs to switch off unexpectedly or oscillate, creating an annoying flickering effect. Early-generation LED lighting designs addressed this problem either by storing energy in an unreliable electrolytic bulk capacitor, adversely affecting bulb lifetime, or by allowing a continuous flow of current into the bulb, wasting energy and thereby defeating the main benefit of LED lighting. Single-stage LinkSwitch-PH ICs, combined with the innovative active damping and bleeding circuitry employed in DER-281, eliminate these pitfalls, providing flicker-free dimming with high efficiency and long lifetime.

"Early adopters of LED lighting have often been disappointed by bulbs that fail because of flawed two-stage drivers reliant on electrolytic bulk capacitors," said Andy Smith, product marketing manager at Power Integrations. "A more robust driver technology is essential as lighting systems become long-lived appliances, rather than disposable items. We believe that the advanced, single-stage approach embodied in DER-281 meets every one of the LED designer's checkboxes — it is highly efficient, accurate, and meets all PFC and harmonic content rules. It's also long-lived and compatible with existing home dimmers."

The reference design report can be downloaded for free on the Power Integrations' website at http://www.powerint.com/sites/default/files/PDFFiles/der281.pdf.

About Power Integrations

Power Integrations is the leading supplier of high-voltage integrated circuits used in energy-efficient power conversion. The company's innovative technology enables compact, energy-efficient power supplies in a wide range of electronic products, in AC-DC, DC-DC, and LED lighting applications. Since its introduction in 1998, Power Integrations' EcoSmart™ energy-efficiency technology has saved an estimated $4.9 billion of standby energy waste and prevented millions of tons of CO2 emissions. The company's Green Room web site provides a wealth of information about "energy vampires" and the issue of standby energy waste, along with a comprehensive guide to energy-efficiency standards around the world. Reflecting the environmental benefits of EcoSmart technology, Power Integrations' stock is included in The Cleantech Index® and the NASDAQ® Clean Edge® Green Energy Index. For more information, please visit www.powerint.com.

Power Integrations, LinkSwitch, EcoSmart, and the Power Integrations logo are trademarks or registered trademarks of Power Integrations, Inc. All other trademarks are the property of their respective owners.

Power Integrations, Inc.
Peter Rogerson, 408-414-8573
Billings Europe PR Agency
Nick Foot, +44 (0) 1491-636 393

Source: Power Integrations, Inc.

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