A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.


Once we removed the casing we found a small, sparsely populated PCB. The OEM of the PSU is Fortron Sparkle (FSP).


The first part of the EMI/transient filtering stage is on the AC receptacle with one X and two Y capacitors. The second is on the main PCB and consists of three coils, one X and two Y capacitors. Unfortunately it lacks the essential MOV (Metal Oxide Varistor) that protects the PSU from spikes coming from the power grid.


The bridge rectifier is a GBU1506, quite an overspecced component for the 500W capacity of the PSU. In the APFC two mosfets, which we were unable to identify, are used and a boost diode. The smoothing/reservoir capacitor is provided by CapXon (85°C, 420V, 270μF). As main switches we find two FDPF18N50.


In the secondary side passive design is utilized so SBRs (Schottky Barrier Rectifiers) are used for the generation of the DC outputs. The +12V rail handles two 30A50CT and the minor rails three 30L45CT. One more 30L45CT is rectifying the 5VSB. The presence of only two coils in the secondary side indicate that group regulation is used. The bigger coil is shared by 12/5V and the smaller is for 3.3V. Finally a mix of Teapo, OST and CapXon capacitors are used for DC output filtering.


The protections IC is a Weltrend WT7527 and the PWM controller a TNY277PN.


On the modular PCB two Teapo capacitors are attached to further decrease ripple.


Soldering quality on the main and modular PCBs in some areas is good enough while in others it is only average. Also we found some quite long component leads.


The fan is made by Yate Loon Electronics and its model number is D12BH-12. A small PCB houses the components that controls fan's RPMs and the thermistor is attached on the secondary heatsink.