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关于TL494震荡频率不稳的问题



正常情况下测量494的5脚锯齿波形正常。当PWM点加入PWM信号时,5脚的锯齿波就呈现出不稳定的状态,频率不稳定。

根据内部原理图来看,5脚为前端的震荡电路,不受后端影响才是,可是只要加PWM就有影响,pwm的频率越小影响越大。

但这个PWM是必须要加的,

求指点