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Cross regulation in flyback?

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grizedale

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Hi

I am doing an offline flyback at 50W.

There is a split rail of +/-35V (+/- 2v) (at 40W)

Also there is a 5V, 20W rail which needs to be 4.5V to 5.5V absolute max

Is it ever advisable to do such a thing without a secondary side smps to give the 5V.

I would have thought cross regulation would never be good enough to give the required 5V output with sufficient accuracy?
 

atripathi

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You can give a try with tighter coupling between all windings, and making 5V output as primary control point.
 
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