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Forum Post: RE: LM5119: Adapting PMP7819 reference design for lower Vin?

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Hello,

Our output voltage is 14V but I think I understand what calculation I need to do now.

Using D = Vout / Vin = 14 / 16 = 0.875 (approx.)

At Fsw = 100kHz, the period is 10uS so we have 10uS - (0.875 x 10uS) = 1.25uS off time. As long as that exceeds the forced HO off time, we're ok? And since the max forced HO off time is 430nS, we're OK with 16Vin for a 14Vout?

Thank you for your help!


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