Current Mode PWM Controller 500mA 16-Pin SOIC T/R

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 shut-down 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.

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

500mA (Peak) Totem-pole Outputs

±1% Bandgap Reference

Under-voltage Lockout

Soft Start Capability

Shutdown Terminal

500kHZ Operation