Fairchild FAN6920MR PFC和PWM电源控制方案
Fairchild公司的FAN6920MR集成了临界模式PFC和准谐振电流模式PWM电源控制器.对PFC, FAN6920MR采用可控导通时间提供调整的DC输出电压,具有最佳的THD优化,而对于PWM, FAN6920MR提供多种功能来增强系统的电源功能.主要用在AC/DC笔记本电脑适配器,无框架开关电源以及电源充电器.本文介绍了FAN6920MR主要特性,方框图和典型应用电路.
FAN6920MR: Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller
The highly integrated FAN6920MR combines Power 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.
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