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higher frequency -> less energy storage -> smaller inductor and capacitor
higher frequency -> faster response
higher frequency -> easier filteríng of input and output ripple
lower frequency -> less switching losses
lower frequency -> easier design
lower frequency -> cheaper semiconductor devices
Negetive points
Higher frequency -- More switching loses & critical PCB layout.
Higher frequency -- EMI on higher harmonics
Higher Frequency -- Additional circuits required to reduce the switching loses & improve the efficiency.
And all other points as rightly said by our friend "FvM"
Positive points
Higher Frequency -- compact & light weight design
Higher Frequency -- Smaller magnetics.
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