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LM3409MY/NOPB工作频率及波形异常

LM3409MY/NOPB,输入12V,输出6-7V/4.5A,目前调试中IC  6脚频率和电压波形不对,而且测试PMOS管D极波形不是方波,波形很乱

但是输出能够恒流工作,请问这是什么问题导致?