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Old 01-04-2018
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If the PFC circuit is more efficient, you have more power to work with beyond that circuit and this makes the entire design more efficient overall. The product is only as good as the sum of its parts and as weak as its weakest link.

PFC tends to be one of the least efficient parts of an SMPS (barring magnetics and capacitors, of course). It can also be one of the hottest parts of a PSU (other than the main transformer in many cases), so to use GaN to both increase efficiency AND reduce size is a win-win no matter how you look at it.
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