Power Integrations, Inc. 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%, 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 0-10 Vdc input.
