Result Analysis and
Discussion
Efficiency
115V
|
|
Load |
Pin(W) |
Pout(W) |
Efficiency |
| 20 % |
146.82 |
132.87 |
90.50 % |
| 50 % |
360.36 |
331.54 |
92.00 % |
| 100 % |
743.62 |
661.83 |
89.00 % |
The platinum Energy
certification requirements (90%, 92%, 89%) are fulfilled at 50 and 100% load
without any margin. The full load efficiency is a bit higher at 230V AC. This is
the case with most PSUs on the market and comes as a results of lower losses in
the AC filtering and in the PFC at 230V AC. The 230V AC 100% Load efficiency is
90.93%.
Output Stability
|
| Load |
Rail |
Loading(A) |
Output(V) |
|
20 % |
5V |
2.46 |
5.056 |
| 3.3V |
2.47 |
3.328 |
| 12V |
9.00 |
12.14 |
| 5VSB |
0.49 |
5.056 |
|
|
|
50 % |
5V |
6.15 |
5.03 |
| 3.3V |
6.14 |
3.33 |
| 12V |
22.43 |
12.10 |
| 5VSB |
1.225 |
5.04 |
|
|
|
100 % |
5V |
12.27 |
5.043 |
| 3.3V |
12.26 |
3.307 |
| 12V |
44.97 |
12.06 |
| 5VSB |
2.64 |
4.965 |
The Voltage Regulation of
this PSU is very good. It makes use of a DC-DC approach. That means, that this
PSU is mainly a 12V PSU and then it generates both 5V and 3.3V from that same
12V.
This is a very modern approach, and since the load is mainly on the 12V rail,
this approach makes a lot of sense. As most PSU which use this topology, the
Voltage regulation and the Crossload test do not present a
problem.
|
Noise |
|
Load |
|
| 20 % |
Noiseless |
| 50 % |
Very
silent |
| 100 % |
Silent |
As we already noted earlier, Seasonic decided to use a Sanyo Denki
San Ace 120mm fan for the SS-660XP2 Platinum Series power supply unit and it
definitely does a great job as the PSU is completely noiseless at 20 percent
load, very silent at 50% and even silent at 100% load.
|
Noise/Ripple |
|
Voltage |
Noise/Ripple Vpp |
| 5V |
0.0191 |
| 12V |
0.0319 |
| -12V |
0.0163 |
| 3.3V |
0.0186 |
| +5VSB |
0.0096 |
The voltage noise values are
good.
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