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LT1930 Dual Output Converter Topology


I notice that LT1930 has a special output circuit (datasheet P8).

How can I calculate the valus as Vin, L1, Iout, Vout, C1 and C2 if I want to change them?

For instance, I need 12V input while dual 18V ouputs.

It seems that the method and fomula are not mentioned in the part of operations.

Is it essentially a SEPIC topology?

What do the diodes D2 and D4 play in that place? Are they equivalent to inductors?

Finally, can this topology be applied to LT1935 and LT3489?


Best Regards