TIDUF59 March 2024
The UCC28056 device drives PFC boost stages based on a mixed mode method that operates in TM and discontinuous conduction mode (DCM) at reduced load, automatically reducing switching frequency. This device incorporates burst mode operation to further improve light load performance, enabling systems to meet challenging energy standards while eliminating the need to switch off the PFC. UCC28056 can drive a PFC power stage up to 300W, providing a sinusoidal line input current with low distortion, close to unity power factor. These features along with FET drain valley turn-on with a simple boost inductor allows the lowest component count and reduced system cost.