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Here are steps to derive the formula.
At the end of half cycle, Ipk = Vin/2/Lm * T/2;
Then, the constant current (Ipk) fully discharge/charge 2* Csw (in parallel) during td.
2Csw * Vin/td = Ipk
Simplified:
Lm = td/(8*Fsw*Csw).
OK，谢谢。那为什么计算工具算出的感量和该公式得到的值有差异？Lm=150/(8*500*170)=220uh 计算工具得出电感量为36uh
差异？Lm=150/(8*500*170)=220uh 计算工具得出电感量为36uh