Scalability of the output voltage of the flyback converter

I built a flyback converter and now I'm looking for
a PWM current mode earth system testing controller. I've found much but you have
all a constant Usoll.

My desire is to change my output voltage via a Usoll.

E.g.

Usoll = 1V ===> Uout = 100V
Usoll = 2V ===> Uout = 300V
Usoll = 3V ===> Uout = 500V
Usoll = 4V ===> Uout = 700V

Maybe someone has an idea.