UC2847中文资料电流模式 PWM 控制器数据手册TI规格书

描述 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 parallelwhile 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.

特性 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% Band Gap Reference
·Undervoltage Lockout
·Soft-Start Capability
·Shutdown Terminal
·500-kHz Operation