摘要：   Fairchild公司的FAN6240是用于反激拓扑转换器和正向续流整流的同步整流(SR)控制器，输出电压5V-24V，超低绿色模式工作电路，典型值为1.1mA，带次级绕组电压检测的PWM频率跟踪，主要用在AC/DC 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FAN6240主要特性，方框图以及两种典型应用电路.

关键字：  转换器，  控制器，  电路，  适配器，  开关电源，  

 Fairchild公司的FAN6240是用于反激拓扑转换器和正向续流整流的同步整流(SR)控制器，输出电压5V-24V，超低绿色模式工作电路，典型值为1.1mA，带次级绕组电压检测的PWM频率跟踪，主要用在AC/DC 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FAN6240主要特性，方框图以及两种典型应用电路.

 FAN6204: Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification

 FAN6204 is a secondary-side synchronous rectification (SR) controller to drive SR MOSFET for improving efficiency. The IC is suitable for flyback converters and forward free-wheeling rectification.

 FAN6204 can be applied in continuous or discontinuous conduction mode (CCM and DCM) and quasi-resonant (QR) flyback converters based on the proprietary innovative linear-predict timing-control technique. The benefits of this technique include a simple control method without current-sense circuitry to accomplish noise immunity.

 With PWM frequency tracking and secondary-side winding voltage detection， FAN6204 can operate in both fixed- and variable-frequency systems.

 In Green Mode， the SR controller stops all SR switching operation to reduce the operating current. Power consumption is maintained at minimum level in lightload condition.

 FAN6240主要特性:

SR Controller

Suited for Flyback Converter in QR， DCM， and CCM Operation

Suited for Forward Freewheeling Rectification

Internal Green Mode for Lower No-Load Power Consumption and Higher Light-Load Efficiency

PWM Frequency Tracking with Secondary-Side Winding Voltage Detection

Ultra-Low VDD Operating Voltage for Various Output Voltage Applications (5V~24V)

Ultra-Low Green Mode Operating Current:

1.1mA Typical

VDD Pin Over-Voltage Protection (OVP)

12V (Typical) Gate Driver Clamp

8-Pin SOP Package

FAN6240应用:

AC/DC NB Adapters

Open-Frame SMPS

Battery Charger