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Old 03-12-2013
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McSteel McSteel is offline
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They're mostly 220V-only because of a slim Graetz bridge (usually 4A/600V) and PFC/primary transistors. Some of the PSUs don't have an undervoltage protection in the APFC stage, so the PSU will actually work below ~180V (which is the usual UVP trip point on 220V-only models). The only problem is if you're pulling more than the bridge and the APFC transistor(s) can handle under reduced voltage input - which is rare, since > 500W 220V-only models are also rare.
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