Component Analysis

Before reading this page, we strongly suggest looking at this article, which will help you better understand the insides of a PSU.



This is the Seasonic Focus Plus Gold platform, which counts several years in production, but still competes with most offerings. The build quality is good, and the parts Seasonic used are of good quality, including Japanese capacitors on the secondary side and an FDB fan by Hong Hua. The design is clean, but uses small heatsinks, which doesn't help keep noise output low.


The transient filter starts on the AC receptacle and continues on the main PCB. It does a decent job.


A Metal Oxide Varistor (MOV) handles voltage surges, while an NTC thermistor suppresses large inrush currents. A bypass relay supports the latter.


The bridge rectifiers are bolted to a dedicated heatsink. Combined, they can handle up to 30 A of current.


The APFC converter uses two Infineon FETs and a CREE boost diode. The bulk cap is by Rubycon and offers 820uF capacity. It is rated for 3,000 h at 105 °C, so its quality is topnotch.


The APFC controller is a Champion CM6500UNX.


The four main switching FETs are installed in a full-bridge topology, and an LLC resonant converter is used for higher efficiency. The resonant controller is a Champion CM6901T6X.


The main transformer is next to the resonant tank and capacitive parts of the LLC resonant converter.


Four Nexperia FETs regulate the +12 V rail. They are installed on the solder side of the main PCB. Small heatsinks above keep operating temperatures under control.


The electrolytic filtering caps are of good quality, and the same goes for the polymer caps.


Two DC-DC converters generate the minor rails. They use five Infineon FETs, and the PWM controller is an ANPEC APW7159C.


The supervisor controller is a Weltrend WT7527V.


The standby PWM controller is an EM8569C IC.


Several polymer and electrolytic caps at the face of the modular panel form an extra ripple-filtering layer.


Soldering quality is good.


The cooling fan is by Hong Hua, and its model number is HA1225H12F-Z. It uses a fluid dynamic bearing, so it will last for quite a while, as you won't be exposing it to high temperatures (above 40°C) for prolonged periods of time.