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请教DC芯片同步整流问题

1.有些数据手册在描述或者特征中写了synchronous,是不是就代表是同步整流?

2.看引脚图中有SYNC的是不是就是同步?

3.看数据手册怎么大部分原理图里好像都没有肖特基二极管,都是MOS管,没有肖特基二极管就是同步?