• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

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 D_MAX 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.

特性

• 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