n.回扫；回描；光的回程
If the pin is shorted to ground, switching of the flyback controller is inhibited. 如果这个脚被对地短路，回扫控制器将被隐藏。
Current mode control is used for the flyback converter for its good line regulation. 回扫转换器工作在电流控制模式能够有很好的线性调整。
