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TIDM-02002: Series resonant frequency about Fr1，Fr2

user4308845
Intellectual 475 points
Part Number: TIDM-02002

I designed the parameters of Cr1, Lr1, Cr2 and Lr2 from  CLLLC_Calculation.xls，Fr1=Fr2=500khz，There is some slight deviation in the frequency value（±20Khz）

Only when Cr2 is removed, Series resonant frequency Fr is near to 500kHZ， When CR2 is introduced, the resonant frequency shifts to about 620khz.

why？

  • 0
    TI__Mastermind 42195 points

    Well I assume you already know the fundamental equations to calculate Fr1 and Fr2, have you considered the tolerances of these components into your calculation? There will be some parasitics as well.

    Regards,
    Cody