This reference design is an isolated offline 240-W driver with Power Factor Correction (PFC), using UCC28810, UCC28811 and TPS92020. This driver is comprised of three stages, including PFC stage, Buck stage, and Isolation stage. Both PFC and Buck stage operate in critical conduction mode. The isolation stage is a half-bridge resonant current converter with an option to adopt the multi-transformer design. A constant current is controlled by the Buck stage to provide 3 A to the LED strings, with output voltage range from 70 V to 85 V.
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