UC1846-DIE
www.ti.com SGLS409 – NOVEMBER 2012 CURRENT-MODE PWM CONTROLLER
FEATURES 1 Automatic Feed-Forward 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
Undervoltage Lockout
Soft-Start Capability
Shutdown Terminal DESCRIPTION
The UC1846 control IC provides all of the necessary features to implement fixed-frequency, 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-to-design
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 to soft-start
capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic …