UC1847

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UC1846, UC1847, UC2846 UC2847, UC3846, UC3847 SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015 UCx846/7 Current Mode PWM Controller 1 Features 1 Automatic Feedforward Compensation Programmable Pulse-by-Pulse Current Limiting Automatic Symmetry Correction in Push-Pull Configuration Enhanced Load Response Characteristics Parallel Operation Capability for Modular Power Systems Differential Current Sense Amplifier with Wide Common Mode Range Double-Pulse Suppression 500-mA (Peak) Totem-pole Outputs ±1% Band Gap Reference Undervoltage Lockout Soft-Start Capability Shutdown Terminal 500-kHz Operation 2 Applications Telecommunication Power Converters Industrial Power Converters 3 Description The UC1846/7 family of control devices provides all of the necessary features to implement fixedfrequency, current-mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-todesign control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules while maintaining equal current sharing. Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition ...