Power Integrations RDR-382 reference design for high-power LED lighting applications

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

The reference design 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, in comparison to traditional dual-stage drivers with separate PFC and LLC stages. 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.

The design is highly efficient, with its reduced component count and low heat generation ensuring a long lifetime. The product can be used to drive single or multiple LED strings and allows analog dimming to be implemented with a 0-10 VDC input.