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Designing a Multiple output Flyback Transformer

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Doubts

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Hi All,

I want to design a Flyback Transformer with multiple outputs.Specifications as follows

I/P = 28v;1A;28W

O/P1 = 15V;0.5A

O/P2 = -15V;0.5A

O/P3 = 12v;1A

Switching frequency = 500KHZ

Anybody please help me with all the necessary design steps, Selection procedure of core, additional things to be taken care, etc.

Other wise support me with a design note or a link where I can study these things
 

BradtheRad

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Will you change any load suddenly? Because if one load changes suddenly on one supply, the other two supplies will change suddenly. This is something to consider in your design. Perhaps you plan to put regulation on all three supplies?

So it looks as though that is four windings you're talking about? I believe you will need to do a lot of winding and unwinding turns, in order to get all of them right.
 

Doubts

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Dear BradtheRad,

My load is fixed as mentioned.
Efficiency is 96% as per calculation.
But I hope I can achieve something in between 90-96%
In that way I can accept few percentage of regulation too.
 

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