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Chinese dead cheap IC PFM flyback calculations

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ali_asadzadeh:
Hi,
I have bought some samples of LP3783, here I would attach it's datasheet PDF, the problem is that their website is some how down and it's in Chinese https://www.chip-hope.com :palm: I do not know why when I click the English version it would not load! |O |O is this their correct website?
Also in the data sheet only a few parameters formulas are shown, so my question is how to design the passives including the transformer for this IC, any hints or a general calculator etc... is highly appreciated!

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