DESCRIPTION
●The UC1846/7 family of control ICs 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 under-voltage 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 restart or latch the supply off.Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a±1% trimmed bandgap reference. The UC1846 features low outputs in the OFF state, while the UC1847 features high outputs in the OFF state.
●FEATURES
●• Automatic Feed Forward Compensation
●• Programmable Pulse-by-Pulse Current Limiting
●• Automatic Symmetry Correction in Push-p Configuration
●• Enhanced Load Response Characteristics
●• Parallel Operation Capability for Modular Power Systems
●• Differential Current Sense Amplifier with Wide Common Mode Range
●• Double Pulse Suppression
●• 500mA (Peak) Totem-pole Outputs
●• ±1% Bandgap Reference
●• Under-voltage Lockout
●• Soft Start Capability
●• Shutdown Terminal
●• 500kHZ Operation
