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LM5045: LM5045同步整流的疑问

Part Number: LM5045


手里现在设计一款18-36V输入12V输出的电 源,使用LM5045作主控芯片,现在问题是:当同步整流开始打驱动时,输出电压会先跌落一下,大概会从10V跌落到5V然后再慢慢上升,请问这个是什么地方的问题导致的?