Preview: Seasonic S12G (SSR-550RT)

[Behemot]

http://www.hardwareinsights.com/prev ... ssr-550rt/

Discuss the article here

[LongRunner]

…I think it is fair to presume we will see pretty the same results in terms of voltage regulation and ripple suppression. Which is not that good for DC-DC modules, mediocre at best and much worse than what Seasonic Platinum lineup (or many competition units) show.

I find this curious. Intuitively, you would think that the DC-DC approach would all but eliminate cross-loading as an issue (within the limits for each rail, of course). At least, that's how I understand it.

Incidentally, there's something near the lower-left corner of the PCB that caught my attention, but ordinary members can't upload attachments to this part of the forum, either.

[Behemot]

Mostly. It does pretty much same under crossload as it does under combined load. The voltage quite holds, but is high. Since I judge according to deviation from ATX standard (so when there should be 5.00 V, you don't want 5.10 V), it gets worse results. And what's worse, these units have some problem with interference or something like that, I get quite high ripple on them.

Whats in lower-left corner?

[LongRunner]

Mostly. It does pretty much same under crossload as it does under combined load. The voltage quite holds, but is high. Since I judge according to deviation from ATX standard (so when there should be 5.00 V, you don't want 5.10 V), it gets worse results. And what's worse, these units have some problem with interference or something like that, I get quite high ripple on them.

Maybe it's just a consequence of having to choose from finite range of resistance values (for the voltage divider or whatever method they use to track the outputs). Presumably they are 1% tolerance, and from the E96 range of values (where the increment is about 2.4% from any given value to the next one up), so error of a few % may be inevitable without trimpots for calibration (if they exist, I can't see them in any of the photos you've currently uploaded).

Whats in lower-left corner?

Nothing. Having peeked at the other photos for the upcoming review, I see that what I thought I saw there was just an illusion.

[Behemot]

I think they are set high on purpose from the plant. You get better efficiency and so, but it starts at 5.1 V and decreases slightly with load (as expected), no rapid changes in there.