- Texas Instraments 48-V to 3.3-V Forward Converter with Active Clamp Reset Model SLUU178A User's Guide

www.ti.com
2.1 Applications
2.2 Features
Description
The UCC2891 is suited for use in isolated telecom 48-V input systems requiring high-efficiency and
high-power density for very low-output voltage, high-current converter applications, including:
• Server Systems
• Datacom
• Telecom
• DSP's, ASIC's, FPGA's
The UCC2891EVM features include:
• ZVS transformer reset using active clamp technique in forward converter
• All surface mount components, double sided half brick (2.2 × 2.28 × 0.5) inches
• Complementary auxilliary drive for active clamp with programmable dead time for ZVS
• Current mode control with synchronization function
• Internal PWM slope compensation
• Start-up directly from telecom input voltage
• Synchronous rectifier output stage allows high-efficiency operation
• Programmable soft-start
• Up to 30-A dc output current
• Regulation to zero load current
• Non-latching, output overcurrent and short circuit protection
• Non-latching, Input undervoltage protection
• 1500-V isolation primary to secondary
Using the UCC2891 Active Clamp Current Mode PWM Controller4 SLUU178A – November 2003 – Revised December 2006
Submit Documentation Feedback