在正常的情况下，UC3846的Pin4在接入1V左右的斜坡补偿的时候，Pin11和Pin14输出脉冲信号波形是方波。突然之间，UC3846的Pin11和Pin14输出脉冲信号波形变得杂乱无章。测量Pin4输出3.0V。在断开斜坡补偿的时候，UC3846的Pin4输出5.76V。更换了芯片后还是和以前一样。请问这是什么原因？如何解决？在没有斜坡补偿的时候，正常情况下，UC3846的Pin4输出多少V？
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