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Fairchild FAN6920MR临界模式PFC电源解决方案 免费猫

发布时间:2020-02-17 13:31:40 阅读: 来源:验钞机厂家

Fairchild FAN6920MR临界模式PFC电源解决方案

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 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应用:

AC/DC NB Adapters

Open-Frame SMPS

Battery Charger

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