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At lower frequencies, the inductors and capacitors need to be larger to have the correct time responses.
The capacitors are probably not that much of an issue since it's generally ripple current ratings, not capacitance, that is the limit. But the inductors would need to be larger.
If you're using several power stages in parallel, it is possible to stagger the clocks and make the effective switching frequency higher, but keep the actual switching frequency the same.
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