UCC2897A

Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design UCC2897A SLUS829G – AUGUST 2008 – REVISED FEBRUARY 2020 UCC2897A Advanced Current-Mode Active-Clamp PWM Controller 1 Features 1 Low-output jitter Soft-stop shutdown of MAIN and AUX 110-V input startup function Ideal for active-clamp, reset-forward, flyback and synchronous rectifier uses Provides complementary auxiliary driver with programmable dead time (Turn-On Delay) between AUX and MAIN switches Peak current-mode control with 0.5-V cycle-bycycle current limiting TrueDrive™ 2-A Sink, 2-A source outputs Trimmed internal-bandgap reference for accurate line UV and line OV threshold Programmable slope compensation High-performance 1-MHz synchronizable oscillator with internal timing capacitor Precise programmable maximum duty cycle PB-free lead finish package 2 Applications High-efficiency DC-to-DC power supplies Server power, 48-V telecom, datacom, and 42-V automotive applications 3 Description The UCC2897A PWM controller simplifies implementation of the various active clamp or reset and synchronous rectifier switching power topologies. The UCC2897A is a peak current-mode fixedfrequency high-performance pulse-width modulator. The controller includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active-clamp operation. Features include an internal p...