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

The UC1846-EP 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 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-EP features low outputs in the OFF state.

Controlled Baseline

• One Assembly/Test Site, One Fabrication Site

Extended Temperature Performance of -55°C to 125°C

Enhanced Diminishing Manufacturing Sources (DMS) Support

Enhanced Product-Change Notification

Qualification Pedigree⁽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

500-mA (Peak) Totem-Pole Outputs

±1% Bandgap Reference

Undervoltage Lockout

Soft-Start Capability

Shutdown Terminal

500-kHz Operation