Texas Instruments High-Performance Analog PFC (Power Factor Correction) UCC38501N

The UCC38501N is a power factor correction (PFC) integrated circuit designed to control a boost preregulator and a downstream DC-DC converter. It achieves near-unity power factor by shaping the AC input current waveform to match the AC input voltage using average current-mode control. The device features peak current-mode control for the DC-DC conversion stage, which allows for efficient step-down power conversion. Key functionalities include accurate power limiting, improved feedforward line regulation, and programmable oscillator settings. The PFC stage utilizes leading-edge modulation, while the second stage employs trailing-edge synchronization to minimize output ripple. The UCC38501N supports a wide input voltage range and includes features such as over-voltage protection, zero-power detection, and programmable soft-start and shutdown capabilities. This IC is available in a 20-pin package and operates within a temperature range of 0¬8C to 70¬8C. It is suitable for applications requiring efficient power factor correction and reliable voltage regulation.