1 Features 3 Description

The UC1846/7 family of control devices provides all

1• Automatic Feedforward Compensation

of the necessary features to implement fixed•

Programmable Pulse-by-Pulse Current Limiting frequency, current-mode control schemes while

• Automatic Symmetry Correction in Push-Pull maintaining a minimum external parts count. The

Configuration superior performance of this technique can be

• Enhanced Load Response Characteristics measured in improved line regulation, enhanced load

response characteristics, and a simpler, easier-to•

Parallel Operation Capability for Modular Power design control loop. Topological advantages include Systems inherent pulse-by-pulse current limiting capability,

• Differential Current Sense Amplifier with Wide automatic symmetry correction for push-pull

Common Mode Range converters, and the ability to parallel power modules

while maintaining equal current sharing. • Double-Pulse Suppression

• 500-mA (Peak) Totem-pole Outputs Protection circuitry includes built-in undervoltage

lockout and programmable current limit, in addition to • ±1% Band Gap Reference

soft-start capability. A shutdown function is also

• Undervoltage Lockout available, which can initiate either a complete

• Soft-Start Capability shutdown with automatic restart or latch the supply

off. • Shutdown Terminal

• 500-kHz Operation Other features include fully-latched operation, doublepulse

suppression, deadline adjust capability, and a

2 Applications ±1% trimmed band gap reference.

• Telecommunication Power Converters The UC1846 features low outputs in the OFF state,

while the UCx847 features high outputs in the OFF • Industrial Power Converters state.

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