A boost converter is tricky to regulate. The control circuit must keep it switching on and off, continually, regardless of the feedback level from your output stage.
Therefore you should design it so the frequency and duty cycle cooperate, to produce your desired output level.
Most likely this will require a lot of time experimenting with a range of frequencies and duty cycles. This will tell you whether it is possible to achieve your desired output, and it will tell you how to design your control circuit.