A Look Inside & Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!


All Edison M series units use the same platform as Seasonic's G series of PSUs. The platform utilizes modern technology, but is still affordable, allowing for lower prices as compared to Seasonic's high-end KM3 and XP2 designs. The primary side uses a half-bridge topology and an LLC resonant converter to boost efficiency, while the secondary side utilizes two DC-DC converters to generate the minor rails, along with a synchronous design for the rectification of the +12V rail. Lots of polymer caps and several Japanese electrolytic caps handle ripple suppression.


Behind the AC receptacle is a small PCB. It hosts four Y caps, one X cap, and a CM choke. The transient filter continues on the main PCB with two more CM chokes, two Y caps, a single X cap, and an MOV.

A leaning heatsink holds the single bridge rectifier, a GBU10V08. In the APFC converter, two Infineon fets and an STTH8S06D boost diode shape the current waveform to make sure it matches the voltage waveform. Finally, the hold-up cap is provided by Rubycon (390uF, 420V, 105°C, MXG series). Right in front of it is the thermistor that protects the unit against large inrush currents.


Two Infineon fets act as primary switchers, and their model number is IPP50R250CP. The fets are arranged into a half-bridge topology.


A vertical daughter-board houses an ICE2HS01G resonant controller (large IC on the left) and an ICE3PCS01 PFC controller (small IC on the right). The resonant controller operates in Pulse-Frequency-Modulation (PFM) in which the repetition rate (or frequency) of fixed-duration pulses varies unlike with PWM where the width of square pulses is varied at a constant frequency. In order to avoid high frequency switching, the aforementioned controller employs Missing Cycle Mode with light loads and Burst Mode with no load.


Four PSMN2R6-40YS fets rectify the +12V rail, and two SBR10U45 Schottky diodes further increase efficiency by reducing switching losses, since they actually replace the body diodes of the aforementioned slower fets with higher forward voltage drops. All the above has been put onto the solder side of the main PCB, and a heatsink on the component side helps lower their operational temperature.


The minor rails are generated by two DC-DC converters.


The supervisor IC is a SITI PS223. It is among the few with support for OTP (Over Temperature Protection).


An Infineon ICE2QR4765 IC is the standby PWM controller. The Schottky diode responsible for 5VSB rectification is an SBR10U45, and it can be found on the solder side of the main PCB.


Many polymer caps by FPCAP are used for filtering purposes in the secondary side, along with several electrolytic Nippon Chemi-Con cap that are rated at 105°C.


Several Chemi-Con caps on the front of the modular PCB provide some extra ripple filtering.


Soldering quality is good overall, although it doesn't match the levels of Seasonic's high-end platforms.


The cooling fan is by Hong Hua, and its model number is HA1225M12F-Z (12 V, 0.22 A, Fluid Dynamic Bearing). It will last pretty long because of its quality bearing; however, its small diameter doesn't help in terms of noise. We believe that they should use a larger fan in order to provide the same amount of airflow at lower speeds, which would significantly decrease noise output.