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Equation for small signal power stage transfer function of voltage mode flyback?

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treez

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Please assist in calculation of the “Q” parameter in an equation for the small signal transfer function of a voltage mode flyback. This concerns document AN57 by power integrations.

AN57:
https://ac-dc.power.com/sites/default/files/product-docs/an57.pdf

In AN57, how is the “Q” parameter calculated in equation 15, page 11?

Is it equal to [1/R] * SQRT(LE/C)
Where:
R = {transformer secondary resistance} plus {transformer primary resistance referred to the secondary}
 

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