求助:关于ir2159

各位前辈,我是一个刚刚开始学电子的在校学生,在用ir2159时遇到了问题,希望大家能教教我!!

实验数据:Vdc 5.4v   Vco 5.21v  Vcph 0v
         Vdim4.85v  Vcs Vsd 0v Vcc 12.6v
测量HO和LO 有80K左右的矩形波,互相反向
    CS上也有较高频率的波形,开电后从60多KHz开始降低.  
        附上图
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L=2.1mH  C=10nF
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