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Forum Post: RE: UCC28950 Vdd power options

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I am using flyback for my designs but with 650V input its not  possible  to implement the supply  with an integrated flyback IC like tny 268 or so.

I suggest an auxilliary winding on your main transformer to make a 15 to 30v dc and then regulate with a linear regulator like 7812.(and of course a  3W start up resistor)

personally I used two switch fly back for my  3 phase 380v  input  10kw converter with ucc3895 but for weight and volume sensitive design its not recommended.

by the way the   power integration website  has an app. note for using their  ICs on higher input voltage that you can find it easily.


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