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DC TO DC buck电感计算

DC芯片里都有电感计算公式L=Vout/Fsw*I*(1-Vout/Vin),这个公式不太明白是什么意思?

1:(1-Vout/Vin)这个是代表了哪个的占空比?

另外:

Ipeak=Iout+Vout/2*Fsw*L(1-Vout/Vin),为什么是2*Fsw*L,还请TI工程师帮忙看看,谢谢!