• - 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 UCC2897A PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

The UCC2897A is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active clamp operation.

Features include an internal programmable slope compensation circuit, precise D_MAX limit, and a synchronizable oscillator with an internal timing capacitor. An accurate line monitoring function also programs the converter’s ON and OFF transitions with regard to the bulk input voltage, VIN.

The UCC2897A adds a second level hiccup mode current sense threshold, bi-directional synchronization and input overvoltage protection functionalities.

特性

• Low Output Jitter
• "Soft Stop" shut down of MAIN and AUX
• 110-V Input Startup Function
• Ideal for Active Clamp/Reset Forward,
  Flyback and Synchronous Rectifier Uses
• Provides Complementary Auxiliary Driver with
  Programmable Deadtime (Turn-On Delay) between
  AUX and MAIN Switches
• Peak Current-Mode Control with 0.5-V
  Cycle-by-Cycle Current Limiting
• TrueDrive™ 2-A Sink, 2-A Source Outputs
• Trimmed Internal Bandgap Reference for
  Accurate Line UV and Line OV Threshold
• Programmable Slope Compensation
• High-Performance 1.0-MHz Synchronizable
  Oscillator with Internal Timing Capacitor
• Precise Programmable Maximum Duty Cycle
• PB-Free Lead Finish Package
• APPLICATIONS
  • High-Efficiency DC/DC Power Supplies
  • Server Power, 48-V Telecom, Datacom, and
    42-V Automotive Applications