Specifications




Seasonic SS-520FL Features & Specs
Max. DC Output520W
PFCActive PFC
Efficiency80 PLUS Platinum
Operating temperature0°C - 50°C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Current Protection
Over Power Protection
Over Temperature Protection
Short Circuit Protection
CoolingFanless
Dimensions150 mm (W) x 86 mm (H) x 160 mm (D)
Weight2.0 kg
ComplianceATX12V v2.31, EPS 2.92
Warranty7 years
Price at time of review (exc. VAT)＄149.90 (MSRP)




Seasonic SS-520FL Power Specs
Rail3.3V5V12V5VSB-12V
Max. Power20A20A43A2.5A0.5A
100W516W12.5W6W
Total Max. Power520W





Cables & Connectors, Power Distribution



Modular Cables
ATX connector (600mm)20+4 pin
4+4 pin EPS12V (650mm)1
6+2 pin PCIe (600mm)2
4 pin Molex (410mm+125mm+125mm)3
4 pin Molex (305mm+125mm)2
SATA (390mm+115mm+115mm)3
SATA (300mm+115mm)2
FDD (+150mm)1





Packaging




















































Contents























Exterior















































A Look Inside & Component Analysis









































































































Test Setup




Primary Rails Voltage Regulation
























5VSB Regulation










Hold-up Time











Inrush Current








Voltage Regulation and Efficiency Measurements





Voltage Regulation & Efficiency Testing Data 
Seasonic SS-520FL
Test12 V5 V3.3 V5VSBPower
(DC/AC)		EfficiencyTemp
(In/Out)		PF/AC 
Volts
20% Load6.807A1.971A1.968A0.980A103.70W91.32%48.56°C0.849
12.071V5.054V3.348V5.088V113.56W38.60°C230.0V
40% Load13.976A3.952A3.944A1.179A207.64W93.59%50.37°C0.933
12.057V5.052V3.344V5.071V221.87W39.32°C230.0V
50% Load17.442A4.951A4.933A1.581A259.66W93.64%52.56°C0.947
12.050V5.049V3.343V5.056V277.31W40.17°C229.9V
60% Load20.918A5.935A5.923A1.980A311.62W93.63%55.49°C0.957
12.042V5.048V3.341V5.040V332.84W41.52°C229.9V
80% Load28.035A7.918A7.905A2.391A415.57W93.18%57.58°C0.968
12.029V5.045V3.338V5.019V445.97W41.98°C230.0V
100% Load35.984A8.920A8.899A2.496A519.48W92.76%59.77°C0.974
12.014V5.042V3.337V5.005V560.02W42.91°C229.9V
110% Load40.321A8.922A8.902A2.498A571.40W92.59%60.41°C0.977
12.010V5.040V3.335V5.000V617.15W43.15°C229.8V
Crossload 11.969A11.999A12.004A0.502A126.99W88.86%54.24°C0.885
12.058V5.048V3.343V5.083V142.91W40.82°C230.1V
Crossload 242.971A1.000A1.003A1.001A530.14W93.52%57.05°C0.975
12.024V5.046V3.343V5.054V566.89W41.28°C229.9V





Efficiency











Efficiency at Low Loads





Efficiency at Low Loads 
Seasonic SS-520FL
Test #12 V5 V3.3 V5 VSBPower
(DC/AC)		EfficiencyPF/AC 
Volts
11.833A1.971A1.969A0.195A39.69W83.28%0.713
12.077V5.055V3.348V5.111V47.66W230.0V
23.407A1.971A1.969A0.389A59.68W87.47%0.769
12.075V5.055V3.348V5.105V68.23W230.0V
34.982A1.971A1.969A0.584A79.68W89.75%0.815
12.073V5.055V3.348V5.098V88.78W230.0V
45.726A1.971A1.969A0.785A89.68W90.40%0.828
12.072V5.055V3.348V5.093V99.20W230.0V





5VSB Efficiency





5VSB Efficiency
Seasonic SS-520FL
Test #5VSBPower (DC/AC)EfficiencyPF/AC Volts
10.101A0.52W68.42%0.043
5.122V0.76W230.4V
20.251A1.28W72.32%0.097
5.117V1.77W230.4V
31.002A5.11W79.23%0.260
5.098V6.45W230.2V
42.501A12.67W82.54%0.364
5.064V15.35W230.2V




Power Consumption in Idle & Standby




Idle / Standby 
Seasonic SS-520FL
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.085V5.059V3.351V5.123V6.00W0.268
230.1V
Standby0.17W0.011
230.3V





Delta Temperature






Cross Load Tests






5V Voltage Regulation Chart




3.3V Voltage Regulation Chart






Efficiency Chart







+12V Ripple Chart






5V Ripple Chart






3.3V Ripple Chart








5VSB Ripple Chart







Advanced Transient Response Tests




Advanced Transient Response 20%
VoltageBeforeAfterChangePass/Fail
12 V12.072V11.956V0.96%Pass
5 V5.053V4.992V1.21%Pass
3.3 V3.348V3.254V2.81%Pass
5VSB5.089V5.052V0.73%Pass

















Advanced Transient Response 50%
VoltageBeforeAfterChangePass/Fail
12 V12.049V11.908V1.17%Pass
5 V5.048V4.969V1.56%Pass
3.3 V3.344V3.221V3.68%Pass
5VSB5.057V5.017V0.79%Pass





Transient Response at 20% Load


























Transient Response at 50% Load






















Turn-On Transient Tests


















Ripple Measurements




Ripple Measurements
Seasonic SS-520FL
Test12 V5 V3.3 V5VSBPass/Fail
20% Load16.8 mV11.1 mV8.1 mV4.5 mVPass
40% Load21.7 mV11.2 mV8.5 mV4.9 mVPass
50% Load24.5 mV11.4 mV8.6 mV5.1 mVPass
60% Load26.1 mV11.5 mV8.7 mV5.3 mVPass
80% Load26.6 mV12.1 mV8.8 mV5.8 mVPass
100% Load29.8 mV12.9 mV9.2 mV7.3 mVPass
110% Load32.1 mV13.0 mV9.9 mV7.8 mVPass
Crossload 119.3 mV12.6 mV8.9 mV7.2 mVPass
Crossload 230.0 mV11.4 mV9.4 mV7.4 mVPass





Ripple at Full Load




















Ripple at 110% Load



















Ripple at Crossload 1





















Ripple at Crossload 2






















Performance Rating






Performance per Dollar








  • The Seasonic Platinum Series Fanless 520 W has an MSRP of ＄149.90
  • Delivered 110% load at 43C with 92.5% efficiency
  • Superb ripple-suppression
  • Tight voltage-regulation
  • Highly efficient
  • Fanless
  • Japanese (electrolytic) caps are used everywhere
  • Fully modular
  • Seven-year warranty
  • Only two PCIe connectors
  • OTP triggering point could be a little higher

9.3





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