Texas Instruments UCC2891 manual Applications

www.ti.com

Description

2.1Applications

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

2.2Features

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

4 Using the UCC2891 Active Clamp Current Mode PWM Controller SLUU178A –November 2003 –Revised December 2006

Submit Documentation Feedback