Compact 25-Watt LED Lighting Design for T8 Tubes

Power Integrations has published a new reference design for a 25-watt LED T8 tube ballast power supply. Notable for industry-leading efficiency of greater than 91%, the design (DER-287) also meets commercial requirements for power factor (PF greater than 0.9) and harmonic distortion (EN61000-3-2 Class C). DER-287 is a single-stage converter built around LNK409EG, a member of the LinkSwitch-PH family of LED driver ICs. Single-stage technology greatly increases product lifetime by eliminating the opto-isolators and large aluminum electrolytic input bulk capacitors required by conventional two-stage solutions.

In addition to the highly integrated monolithic design that combines controller, driver, and switching MOSFETs into a single package, Power Integrations' LinkSwitch-PH family features a number of protection features, including over-temperature and over-current protection. This means that very few external components are required to implement the solution — a very important consideration in compact T8 tube enclosures.

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