使用TL494做电源,输入12V,输出0~10V可调,生产了大概6K台左右,在生产的过程中,有9PCS的TL494功能不正常,电压不能调节到接近0,换上新的就可以,坏件拆掉,测量第一脚和第7脚的电阻均为180欧左右,新件测量该两脚的电阻为无穷大,请帮忙分析下可能的造成器件损坏的原因。
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