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LED drivers streamline ballast, low-cost lamp designs

28 Jan 2016

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Power Integrations has unveiled its LYTSwitch-5 single-stage LED driver IC family that combines PFC and constant-current output, and support multiple common LED driver topologies. 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.

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. Additionally, a choice of low-side or high-side switching enables designers to optimise for low EMI or for reduced inductor complexity. By achieving over 90 per cent efficiency, 0.9PF, less than five per cent THD and ±3 per cent current regulation accuracy over line, load, production variance, temperature and multiple topologies, LYTSwitch-5 is ideal for solid-state lighting applications below 25W, the company indicated.


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. 650V and 725V MOSFET options are available to optimise surge-withstand performance for various product types and geographical installations.

LYTSwitch-5 LED driver ICs offer up to 25W, an extended universal input range (90VAC to 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.

LYTSwitch-5 IC samples are available. Devices are priced at $0.46 in 10,000-piece quantities.

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