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开关电源输出级LC品质因数公式是什么?

LC串联谐振和并联谐振的品质因数公式是清晰的,如下所示,但是对于降压开关电源中的L,C,Rout组成的电路,品质因数公式是什么? 因为它是CRout并联再与L 串联的电路,如果再考虑电容ESR就更加复杂了。