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FairchildFAN6920MR临界模式PFC电源解决方案

发布时间:2020-06-30 20:10:14 阅读: 来源:转向盘厂家

Fairchild公司的FAN6920MR是采用mWSaver技术的集成了临界模式PFC控制器和准谐振电流模式PWM控制器,提供了成本效益的设计和降低了外接元件. FAN6920MR具有谷低检测,绿色模式工作以及高/低火线电压超功率补偿,从而提高了电源系统的性能,主要用在笔记本电脑适配器,开架开关电源和电池充电器.本文介绍了FAN6920MR主要特性,方框图, 典型应用电路图, 设计案例最终电路图,材料清单和PCB布局考虑.FAN6920MR: mWSaver? Technology Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM ControllerFactor Correction (PFC) controller and quasi-resonant PWM controller. Integration provides cost-effective design and reduces external r PFC, FAN6920MR uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power-factor correction. With an innovative THD optimizer, FAN6920MR can reduce input current distortion at zero-crossing duration toimprove THD r PWM, FAN6920MR provides several functions to enhance the power system performance: valley detection, green-mode operation, and high / low line over-power compensation. Protection functions include secondary-side open-loop and over-current with autorecovery protection; external auto-recovery triggering; adjustable over-temperature protection by RT pin; and external NTC resistor, internal over-temperature shutdown, VDD pin OVP, and DET pin over-voltage for output OVP, and brown-in / out for AC input voltage e FAN6920MR controller is available in a 16-pin small-outline package (SOP).FAN6920MR主要特性:? Integrated PFC and Flyback Controller? Critical-Mode PFC Controller? Zero-Current Detection for PFC Stage? Quasi-Resonant Operation for PWM Stage? Internal Minimum 5μs tOFF for QR PWM Stage? Internal 5ms Soft-Start for PWM? Brownout Protection? High / Low Line Over-Power Compensation? Auto-Recovery Over-Current Protection? Auto-Recovery Open-Loop Protection? Externally Auto-Recovery Triggering (RT Pin)? Adjustable Over-Temperature Protection? VDD Pin and Output Voltage OVP (Auto-Recovery)? Internal Over-Temperature Shutdown (140°C)FAN6920MR应用:? AC/DC NB Adapters? Open-Frame SMPS? Battery Charger图N6920MR方框图图N6920MR典型应用电路图图N6920MR设计案例最终电路图图4. 设计案例布局考虑设计案例材料清单:

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