UC2846N Current-Mode PWM Controller 500kHz, 8-40V Input 1A Totem Pole DIP-16 -40°C to +85°C

UC2846N

Features

• 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%BandGapReference

• Undervoltage Lockout

• Soft-Start Capability

• Shutdown Terminal

• 500-kHz Operation

Applications

• Telecommunication Power Converters

• Industrial Power Converters

Description

The UC1846/7 family of control devices 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 band gap reference.

The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.

INFORMATION

Drawing

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