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关于LM211输出问题?

Other Parts Discussed in Thread: LM211, LM111

输入频率在1MHZ时候,LM211的第七引脚,VO输出的波形:

原理图上的S1配置为S1的第一引脚打开。VIN+输入1MHZ的PWM波形,VIN-下拉到地。请帮忙看一下,是否是设计出现了问题,我的输入波形为频率为1MHZ的PWM波形,高电平为5V,低电平为0V。