Single-stage LED driver ICs support multiple topologies

26th January 2016

Nat Bowers

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Datasheet

Combining PFC and constant-current output, the LYTSwitch-5 single-stage LED driver IC family has been introduced by Power Integrations. The devices achieve over 90% efficiency, 0.9 PF, less than 5% THD and ±3% current regulation accuracy over line, load, production variance, temperature and multiple topologies, making it suited for solid-state lighting applications below 25W.

Solid-state lighting applications have highly variable driver requirements, and power engineers are often challenged to develop optimised designs quickly in response to requests from lighting designers. The LYTSwitch-5 family supports the safety-rated isolated flyback topology for ballast applications and non-isolated topologies such as buck and buck-boost for low-cost lamps and bulbs. Additionally, a choice of low-side or high-side switching enables designers to optimise for low EMI or for reduced inductor complexity.

The high efficiency of LYTSwitch-5 LED driver designs results in smaller heatsinks, more compact implementations and increased lifetime. Highly accurate CC regulation reduces the degree of overdesign required to guarantee compliance to lumen output standards from regulatory bodies such as the California Energy Commission (CEC) and ENERGY STAR. 650 and 725V MOSFET options are available to optimise surge-withstand performance for a variety of product types and geographical installations.

Hubertus Notohamiprodjo, Product Marketing Director, Power Integrations, commented: “LYTSwitch-5 ICs suit multiple applications including tubes, down-lights and high- and low-bay ballasts. The simple designs and low component count enabled by these new ICs result in compact, reliable, high-performance driver circuits and a platform-based design approach with increased manufacturing throughput.”

LYTSwitch-5 LED driver ICs offer up to 25W, an extended universal input range (90-308VAC) and wide output voltage range (2:1). Protection features include thermal foldback with end-stop shutdown, short-circuit protection, input and output OVP, overcurrent protection and safe brown-in and brown-out.

Available now for sampling, LYTSwitch-5 ICs are priced at $0.46 in 10,000 unit quantities. A reference design, DER-515, is available for download now from the Power Integrations website.