TOP261EN - zero load output voltage

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Hello sirs,

I designed a wide range (90Vac to 240Vac) sigle output 29Vdc 200W flyback.

It works fine in all conditions like:

a) 110Vac full load

b) 110Vac zero-load

c) 240Vac full load

But in the condition 240Vac zero-load the output start to goes up to 35Vdc and remains there.

To ensure that 29Vdc is guaranteed at 240Vac i have to put a 2W load on output.

Do you have an idea how to solve it without losing 2 Watts?

Many thanks and have a nice day.

A.