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Fairchild公司的FAN6920MR是采用mWSaver技術(shù)的集成了臨界模式PFC控制器和準(zhǔn)諧振電流模式PWM控制器,提供了成本效益的設(shè)計和降低了外接元件. FAN6920MR具有谷低檢測,綠色模式工作以及高/低火線電壓超功率補償,從而提高了電源系統(tǒng)的性能,主要用在筆記本電腦適配器,開架開關(guān)電源和電池充電器.本文介紹了FAN6920MR主要特性,方框圖, 典型應(yīng)用電路圖, 設(shè)計案例最終電路圖,材料清單和PCB布局考慮. FAN6920MR: mWSaver™ Technology Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller Factor Correction (PFC) controller and quasi-resonant PWM controller. Integration provides cost-effective design and reduces external components. For 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 to improve THD performance. For 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 UVP. The 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應(yīng)用: AC/DC NB Adapters Open-Frame SMPS Battery Charger 
圖1.FAN6920MR方框圖
圖2.FAN6920MR典型應(yīng)用電路圖
圖3.FAN6920MR設(shè)計案例最終電路圖
圖4. 設(shè)計案例布局考慮 設(shè)計案例材料清單:
詳情請見: http://www.fairchildsemi.com/ds/FA/FAN6920MR.pdf 和 http://www.fairchildsemi.com/an/AN/AN-6920MR.pdf |
