Fairchild FAN6863反激电源PWM控制方案

Fairchild 公司的FAN6863是高度集成的反激电源绿模式PWM控制器，设计用在小于40W和待机功耗小于100mW的消费类电子产品如适配器，机顶盒（STB），上网本等. FAN6863的起动电流为8uA，绿模式（Green Mode）的工作电流600uA，具有软驱动以降低EMI，主要用在通用的开关电源和反激电源转换器。本文介绍了FAN6863主要特性，方框图以及起动电路图和应用电路图。

FAN6863：Highly Integrated Green-Mode PWM Controller

A highly integrated PWM controller, FAN6863 provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary Green Mode provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters Burst Mode, which completely shuts off PWM output. Output restarts just before the supply voltage drops below the UVLO lower limit. Green Mode enables power supplies to meet international power conservation requirements.

The FAN6863 is designed for SMPS and integrates a frequency-hopping function that helps reduce EMI emission of a power supply with minimum line filters.
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