TI UCC28070 300W PFC高效电源参考设计

TI 公司的UCC28070是先进的功率因素修正器件，集成了两个工作在180度反相的PWM。 这种PWM交叉工作能降低输入和输出纹波电流，使得导电EMI滤波变得更加容易，成本更低。可编程工作频率从30 kHz 到300 kHz，有极好的效率和多种保护功能，主要用在高效服务器和台式PC电源，通信整流器，白色家电和工业设备。本文介绍了UCC28070 主要特性，简化方框图和功能方框图，以及采用两个UCC28070的四相输出应用框图，300W交叉PFC预稳压器参考设计主要指标，控制器电路图和电源电路图。

UCC28070 300W Interleaved PFC Pre-regulator Design Review (Rev. B)

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.

UCC28070 主要特性：

Interleaved Average Current-Mode PWM Control
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