Hello balzee,
Yes it is possible.
Actually the typical power supply is a boost (operating as PFC controler) plus a flyback.
You may consider each converter as a separated block and calculate the output voltage as a multiplication of different converter ""gains"". This is an approximate aproach.
However there are a few considerations to take into account (and provably more, depending on the objective of the project):
- The buck, is voltage input current output converter while the boost is a current input, voltage output converter. The buck-boost is voltage-voltage. It is recommended not to connect voltage to voltage nor current to current converters toguether. I.E. Boost - buck is ok, buck-buckboost ok, buck - buck ok, but boost - buck it is not recommended.
- Minimize the number of cascaded converters for simplicity, efficiency and stability
- The overal control may become more complex
- Intermediate filtering may be requiered (capacitors or inductors), considere syncronizing switching frequency of different DC/DC
Hope it helps!
Ernest