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lt3748 input/output capacitance and sense resistor

Hey everyone,

Can someone please provide me with an app note or info on how the following is calculated:

  • Input current required to sustain a certain output current/voltage for the selection of the sense resistor.
  • How to select the minimum input and output capacitance for the lt3748.

Lastly, I've setup a simulation model in ltspice assuming some values for the above mentioned components, however I'm also simulating the transformer.

My issue is that the transformer is currently simulated as if it were ideal (a k-factor of 1). How do I simulate the correct k-factor taking into account leakage inductance, etc.

Thanks in advance for any help!

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