DC Load Regulation and AC Ripple
DC Output Load Regulation
To simulate real world and maximum loading conditions, the Nightjar NJ520 PSU was connected to the load testers and supplied with a constant 115 VAC. In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads.
The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs. I have also included a second table of expanded tolerances (±1% to ±6%) for reference.
The following tables list the DC voltage results for the PSU while operating on 115 VAC, 60 Hz.
The NJ520 fanless PSU produced outstanding load regulation on all of the outputs across a broad range of loads. The three primary outputs (+3.3V, +5.0V and +12V) stayed easily within ±2% of their target values, which is exactly what SilverStone claims for this power supply.
AC Ripple and Noise on the DC Outputs
The amount of AC ripple and noise present on the DC outputs was checked using a digital oscilloscope. This AC component may be present in the KHz range where most switching power supplies operate or it may be more prevalent at the 60 Hz line frequency. We adjust the O-scope time base to look for AC ripple at both low and high frequencies. The ATX12V V2.2 specification for DC output noise/ripple is defined in the ATX12V Power Supply Design Guide.
Ideally we would like to see no AC ripple (repetitive) or noise (random) on the DC outputs – the cleaner the better! But in reality there will always be some present. I measured the amplitude of the AC signal (in millivolts, peak-to-peak) to see how well the power supply complied with the ATX standard. The following table lists the ripple/noise results during all of the load tests for the main output voltages of interest.
The Nightjar NJ520 power supply exhibited excellent AC ripple suppression on all of the outputs and stayed well below the recommended values, even at full load.
this is Great for a mini-ITX
this is Great for a mini-ITX build!
I probably would have put the
I probably would have put the thermal sensor near the area where the PSU develops its 12-volt power for the PC while having a GPU and other things attached to it running at max (i.e. gaming).
Wow, this is great. Im
Wow, this is great. Im planning a game build to do with my daughter this july, This might be our PSU. Id rather get the upcoming SFX 600 from silverstone, but try as I might, I cannot find any info on the release of it. Even though they have been teasing it for quite some time. Thanks for showing off this unit, RoboTech. And thanks to Silverstone, now send one to OC3D, so I can see how it handles a 780.
In my opinion, this is
In my opinion, this is Seasonic power supply with Silverstone name on it. This is Seasonic Platinum-520 FANLESS without painting. Even the sticker is the same shape as the one on Seasonic power supply’s. Warranty sticker is no different from that on the Seasonic branded. Seasonic – 139.99, Silverstone – 149.99. Big disappointment Silverstone, big disappointment 🙁
Hey Lee,
This is a great idea
Hey Lee,
This is a great idea which a fan less power supply for silent operation, instead of fan a ribbon is used it work great. i think this is the first one to introduce fan less power supply to pc. Now a inverters and generators are also manufactured with out much noise and emission. As well as the performance of the silverstone nightjar is good according to the performance test that you have done.
Thanks & Regards,
Venki