SLYT838 January 2023 UCD3138
This novel peak current mode control method for PFC has many advantages compare to traditional average current mode control method. Placing the PFC controller on the secondary side of the AC/DC power supply to create a combo controller with the DC/DC controller reduces costs. Eliminating the current shut resistor improves efficiency by eliminating power losses. Improving THD by eliminating the feedback signal error caused by small PWM duty when using current transformer. Finally, it is easy to implement this control method with existing digital power controllers such as C2000 MCUs and the UCD3138.