@halcy active power factor correction would probably stop working properly if you went too mad with the frequency but the actual converter usually just rectifies to a high voltage DC rail anyway so the mains input doesn't matter much for functionality (except maybe on newer GaN ones, not 100% sure on the topology there)
even at 80V input it would likely work, although the increased high side ripple current might cause the input caps to get very warm.
heck, you could feed it a triangle wave
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