UCC2893中文资料具有 N 沟道钳位 FET 和 0.75V CS 阈值的 110V 有源钳位电流模式 PWM 控制器数据手册TI规格书

描述 Description

The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.

The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.

The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.

Additional features include an internal programmable slope compensation circuit, precise DMAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\\x92s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design.

特性 Features

• Low Output Jitter
• Soft-Stop Shutdown of MAIN and AUX
• Ideal for Active Clamp/Reset Forward, Flyback Converters
• Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
• Peak Current-Mode Control with Cycle-by-Cycle Current Limiting
• 110-V Input Startup Regulator on UCC2891/3
• TrueDrive™ 2-A Sink, 2-A Source Outputs
• Accurate Line UV and Line OV Threshold
• Programmable Slope Compensation
• 1.0-MHz Synchronizable Oscillator
• Precise Programmable Maximum Duty Cycle
• Programmable Soft Start
• APPLICATIONS
• 150-W to 700-W SMPS
• High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters
• Server, 48-V Telecom, Datacom
• High Power Adapter, LCD-TV and PDP-TV

简介

UCC2893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UCC2893DC-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。