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有关UCC28950做移相遇到的问题

Other Parts Discussed in Thread: UCC28950

大家好,我最近用UCC28950做移相全桥,我在用直流稳压管接入移相全桥电路时,发现同步整流不开启,这是怎么回事呢?同步整流开启是不是要某个引脚的电压达到一定值呢?