Texas Instruments High-Performance Analog PFC (Power Factor Correction) UCC28502NG4

The UCC28502NG4 is a power factor correction (PFC) integrated circuit designed to control an active preregulator and a downstream DC-DC converter. It achieves near-unity power factor by shaping the AC input line current to match the AC input voltage using average current-mode control. The device features peak current-mode control for the DC-DC converter, ensuring efficient step-down power conversion. Key functionalities include accurate power limiting, improved feedforward line regulation, and a programmable oscillator. The PFC stage employs leading-edge modulation, while the second stage utilizes trailing-edge synchronization to minimize overlap between the boost and PWM switches, thereby reducing output ripple. The UCC28502 also incorporates a low start-up supply current, synchronized second stage start-up with programmable soft-start, and programmable shutdown capabilities. The device operates over a wide range of input-line voltages and includes features such as over-voltage protection and zero-power detection. It is available in 20-pin N and DW packages, making it suitable for various applications requiring efficient power management and regulation.