White Paper | Technology | Feb 27, 2013

PI's New LED-Downlight Reference Design Achieves High-Performance Dimming While Further Reducing Component Count

Power Integrations, a world leader in high-efficiency, high-reliability LED driver ICs, today announced RDR-347, an LED-downlight reference design. The new circuit demonstrates the capabilities of the recently launched LYTSwitch™ IC family, which offers the industry’s best high-end dimming performance from a single-stage LED driver– together with all the associated efficiency, space and cost benefits that the single-stage approach brings.

The RDR-347 12 W reference design, based on the LYT4313E, delivers a power factor greater than 0.95 and reduces total harmonic distortion (THD) to less than 10% - easily meeting EN61000-3-2C requirements. Efficiency is greater than 86% at 120 VAC – industry-leading performance for an isolated solution capable of operating with a wide range of dimmers. This performance is possible because LYTSwitch ICs use one combined PFC and CC power conversion stage which minimizes losses and cuts component count, which in turn increases reliability and decreases cost.

TRIAC dimming is challenging, especially deep-dimming where TRIAC asymmetry between half-cycles can have a significant effect. RDR-347 shows that Power Integrations’ LYTSwitch driver IC works excellently, even at very low output currents, without any shimmer or flicker. The design also demonstrates system start-up without noticeable hysteresis (so-called “pop-on effect”), even in deep-dimming. The IC features a very fast start-up time (under 500 ms) even when dimmed to 10% output current, achieving the ‘instant-on” condition that many customers want, but that many designs in the market cannot provide.

Comments Andrew Smith, senior product marketing manager for Power Integrations: “By using our LYTSwitch driver, lighting engineers can achieve excellent dimming with minimal efficiency loss.”

RDR-347 is available for download via the Power Integrations website at http://www.powerint.com/sites/default/files/PDFFiles/rdr347.pdf

About Power Integrations:
Power Integrations, Inc., is a Silicon Valley-based supplier of high-performance electronic components used in high-voltage power-conversion systems. The company’s integrated circuits and diodes enable compact, energy-efficient AC-DC power supplies for a vast range of electronic products including mobile devices, TVs, PCs, appliances, smart utility meters and LED lights. CONCEPT IGBT driver systems enhance the efficiency, reliability and cost of high-power applications such as industrial motor drives, solar and wind energy systems, electric vehicles and high-voltage DC transmission. Since its introduction in 1998, Power Integrations’ EcoSmart® energy-efficiency technology has prevented billions of dollars’ worth of energy waste and millions of tons of carbon emissions. Reflecting the environmental benefits of the company’s products, Power Integrations’ stock is included in the NASDAQ® Clean Edge® Green Energy Index, The Cleantech Index®, and the Ardour Global IndexSM. For more information, including design-support tools and resources, please visit www.powerint.com; visit Power Integrations’ Green Room for a comprehensive guide to energy-efficiency standards around the world.

FEATURED

LUXTECH Introduces LUXroll: Architectural-Grade Flex Family

LUXTECH Introduces LUXroll: Architectural-Grade Flex Family LUXroll by LUXTECH brings a new standard of architectural quality, versatility, and ease of use to the flexible LED module market. Every SKU has repeating sets of poke-in connectors in a familiar 20 mm PCB width so there is no need for soldering. LUXTECH LED modules are designed to be used in ... Read more »

FEATURED

Edison Released Brand New DOB III Series Products

Edison Released Brand New DOB III Series Products The DOB III series increased the efficiency, dimming smoothness also provide ultra- low flicker function (flicker 5% and even 5% during dimming). It is compliant to the 2021 European flicker standard IEC TR61547( PstLM) and to CIE TN006 (SVM) on request. It can be applied in many different lighting ... Read more »

EDITORIAL

Würth Elektronik's Power-Saving WL-SMTW: Colors for Feeding Plants

Würth Elektronik's Power-Saving WL-SMTW: Colors for Feeding Plants SMT mountable LEDs in a 2835 package extend Würth Elektronik extensive range of horticulture LEDs. The three WL-SMTW series LEDs emit light of the wavelengths 450 nm (Deep Blue), 660 nm (Hyper Red) and 730 nm (Far Red) – ideal for applications controlling plant growth through specific light ... Read more »

EDITORIAL

Higher-Performance UV-C Solutions from Lumitronix Feature Nichia's New NCSU334B UVC LED

Higher-Performance UV-C Solutions from Lumitronix Feature Nichia's New NCSU334B UVC LED Following the successful introduction of the first UVC LED modules in August 2020, LED expert Lumitronix from Hechingen is expanding the existing concept of linear module solutions with three new, more powerful versions. These are as well mainly addressed to professional customers who are trained ... Read more »

EDITORIAL

Nexperia Launches Industry-First LED Drivers in DFN Package with Side-Wettable Flanks

Nexperia Launches Industry-First LED Drivers in DFN Package with Side-Wettable Flanks Nexperia, the expert in essential semiconductors, today announced a new range of LED drivers in the space-saving DFN2020D-6 (SOT1118D) package. This case style features side-wettable flanks (SWF) which facilitate the use of AOI (automated optical inspection), and improve reliability. This is the ... Read more »