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经CD4504B转换后的电平脉宽变大,求解决!!!

Other Parts Discussed in Thread: CD4504B

由于控制芯片产生的驱动电平是12V,驱动芯片只能接受5V电平,所以我在中间加了一级CD4504B进行电平转换,12V--->5V。

发现加上主电后,转换后的电平脉宽变大了。请问有什么解释吗和办法吗?