UCC28056CDBVR

The Texas Instruments UCC28056CDBVR is a high-performance, 6-pin PFC controller operating in transition mode (TM) and discontinuous conduction mode (DCM). It supports a wide input voltage range of 8.5V to 34V and is housed in a compact SOT-23-6 package, suitable for surface mounting.

This controller is engineered for excellent light load efficiency and high efficiency across a wide load range, thanks to its multi-mode TM and DCM control. It enables ultra-low no-load input power, achieving less than 80-mW standby power at 230V AC in PFC+LLC systems. The design facilitates low system cost by utilizing FET drain valley synchronized turn-on, eliminating the need for a second winding on the boost inductor.

The UCC28056CDBVR is designed to comply with green power standards such as EuP Lot 6, CoC Tier 2, Energy Star, and DoE Level VI. It features burst mode operation with soft-entry and soft-exit periods for ultra-low audible noise output. An enhanced error amplifier ensures rapid response to load steps without degrading input current distortion. Additional features include user-adjustable valley delay, low start-up current consumption (<46 µA), cycle-by-cycle current limit, second independent output over-voltage protection, and integrated over-temperature protection.