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TL494集电极和发射极输出PWM信号是反相的，做BOOST电路的话应该用那个口输出PWM信号呢？
见图3，图4。
当输出增大时占空比减小，但是如果用集电极输出的话PWM信号会反相，那占空比不是反而增大了吗？
