What is the best digital switched mode power supply controller to choose for my final year project?

i am in my final year of my degree and have decided to base it around designing and building a digital switched power supply controller, after researching the area i am having trouble figuring out exactly the best way to go about building it should i build ac- dc or dc-dc? and also how do i use matlab in all of... show more i am in my final year of my degree and have decided to base it around designing and building a digital switched power supply controller, after researching the area i am having trouble figuring out exactly the best way to go about building it should i build ac- dc or dc-dc? and also how do i use matlab in all of this? your help will be much appreciated thanks
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