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LM5122工作频率能否达到750k?

Other Parts Discussed in Thread: LM5122

4.5V-6V输入,12V输出      原理图

mos管PSMN6R1-30YLD上没驱动信号,断开mos管LM5122的16脚(LO)上方波有振铃,HO无波形。

输入10V,LO与HO悬空,HO无方波,LO波形如下:

请专家指教