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TL3844P 正激3PIN ISENSE 不保护是什么原因?

TL3844P做的300正激充电线路,输入AC230,输出12V25A,在开机充电时,在几个周期后PIN3电压超过1V限定值没有保护,直到电压到4.5V后才关断,请问这是怎么回事?