具体推导内容:While the transistor is ON Vx =Vin, and the OFF state the inductor current flows through the
diode giving Vx =Vo. For this analysis it is assumed that the inductor current always remains flowing
(continuous conduction). The voltage across the inductor is shown in Fig. 7(第二张波形图) and the average must be zero for
the average current to remain in steady state
由此得出公式: Vin*Ton + (Vin - Vo)*Toff = 0
这个公式用到的是什么定理(电压和时间的乘积),不太明白,请DX们赐教这段推导过程，谢谢!
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