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New Reference Design for High-Power LED-Lighting Applications

Dec29_PIPower Integrations has announced a new reference design for LED streetlights, high-bay lights and other high-power LED-lighting applications. The new design, RDR-382, describes a constant current, 43 V (nominal), 150 W reference power supply for 90 to 265 VAC solid-state lighting, utilizing Power Integrations HiperPFS-2 PFC controller ICs and HiperLCS integrated LLC power stage ICs.

Traditional dual-stage drivers with separate PFC and LLC stages produce a constant-voltage (CV) output requiring multiple DC-DC converters to convert the output to constant current (CC). In contrast, RDR-382 uses a novel feedback and control scheme, which enables the LLC to provide constant current directly at the output. As a result, component count is cut by approximately one-third, efficiency is increased to > 93  percent, and the elimination of the DC-DC converter stage significantly reduces size. Additionally, the high nominal LLC switching frequency (250 kHz) reduces the size of the required magnetics, while the use of a continuous-conduction-mode, variable-frequency PFC stage reduces EMI compared to fixed-frequency alternatives.

Comments Andrew Smith, senior product marketing manager for Power Integrations: “Reliability is especially important for high-power lighting applications above 75 W output. Because this design is high efficiency, less heat is generated. In combination with a reduced component count, this ensures a long lifetime.”

RDR-382 can be used to drive single or multiple LED strings and allows analog dimming to be implemented with a 0 to 10 VDC input. The reference design can be downloaded from: http://led-driver.power.com/sites/default/files/PDFFiles/rdr382.pdf.

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