UC3847中文资料在关断状态下具有高输出、温度范围为 0°C 至 70°C 的双端 500KHz 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 parallel 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.

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

简介

UC3847属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由TI制造生产的UC3847DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。