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为什么UC3846的Pin11和Pin14输出的波形突然变得杂乱无章

Other Parts Discussed in Thread: UC3846

       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?