• - 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 UCC28070 is an advanced power factor correction device that integrates two pulse-width modulators (PWMs) operating 180° out of phase. This interleaved PWM operation generates substantial reduction in the input and output ripple currents, and the conducted-EMI filtering becomes easier and less expensive. A significantly improved multiplier design provides a shared current reference to two independent current amplifiers that ensures matched average current mode control in both PWM outputs while maintaining a stable, low-distortion sinusoidal input line current.

The UCC28070 contains multiple innovations including current synthesis and quantized voltage feed-forward to promote performance enhancements in PF, efficiency, THD, and transient response.

器件用途

• High-Efficiency Server and Desktop Power Supplies
• Telecom Rectifiers
• White Goods and Industrial Equipment

特性

• Interleaved Average Current-Mode PWM Control
  with Inherent Current Matching
• Advanced Current Synthesizer Current Sensing for
  Superior Efficiency
• Highly-Linear Multiplier Output with Internal Quantized
  Voltage Feed-Forward Correction for Near-Unity PF
• Programmable Frequency (30 kHz to 300 kHz)
• Programmable Maximum Duty-Cycle Clamp
• Programmable Frequency Dithering Rate and Magnitude
  for Enhanced EMI Reduction
  • Magnitude: 3 kHz to 30 kHz
  • Rate: Up to 30 kHz
• External Clock Synchronization Capability
• Enhanced Load and Line Transient Response through Voltage
  Amplifier Output Slew-Rate Correction
• Programmable Peak Current Limiting
• Bias-Supply UVLO, Over-Voltage Protection, Open-Loop Detection,
  and PFC-Enable Monitoring
• External PFC-Disable Interface
• Open-Circuit Protection on VSENSE and VINAC pins
• Programmable Soft Start
• 20-Lead TSSOP/SOIC Packages