FairchildFAN6920MR臨界模式PFC電源解決方案
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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應用:
? AC/DC NB Adapters
? Open-Frame SMPS
? Battery Charger
圖1.FAN6920MR方框圖
圖2.FAN6920MR典型應用電路圖
圖3.FAN6920MR設計案例最終電路圖
圖4. 設計案例布局考慮
設計案例材料清單:
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