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TL494问题

Other Parts Discussed in Thread: TL494

 额定输入20v,输出10v2A。,但是根本启动不了啊,上点494集电极输出直接占空比100%,也就是高电平,这样会导致ir2110上管输出根本无法输出,这样电路就死了。494输出不是最大占空比96%吗?为啥我输出到达100%了呢?