New reference design for high-power LED applications

22 December 2014

Power Integrations 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, 43V (nominal), 150W reference power supply for 90-265 VAC solid-state lighting, utilising 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%, and the elimination of the DC-DC converter stage significantly reduces size. Additionally, the high nominal LLC switching frequency (250kHz) 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 75W output. As this design has high efficiency, less heat is generated. In combination with a reduced component count, this ensures a long lifetime. The new reference design for high-power LED-lighting applications RDR-382 can be used to drive single or multiple LED strings and allows analog dimming to be implemented with a 0-10 VDC input. 

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