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LM2904DR应用问题

Dear team,

我有LM2904DR的问题
方块图如下

当我输入是72V时,我的NCP431会产生约2.2V出来给2904的N-
目前我量测R4电阻(黄框)的端点波形时,量测到下图

请问此波型是否能优化为正常的方波?抑或2904的比较波形即是如此?

Thank you.