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.


Despite the modern external look, the inside doesn't use cutting edge technology, like an LLC converter or a full bridge phase shift ZVS (Zero Voltage Switching) topology. We immediately recognized the original manufacturer by the familiar design. Highpower/Sirfa is behind this platform.


As usual we will begin the internal description with the transient filtering stage. This starts at the AC receptacle with one X and two Y capacitors. Right next to the AC receptacle we find the small On/Off switch and the rear side of the LED-lit Thermaltake sign. The transient filter continues on the main PCB with an MOV, two coils, two Y and one X caps.


The two bridge rectifiers, GBU2506, are bolted on a heatsink.


The APFC mosfets are three IPW60R125CP. The APFC capacitors are provided by Nippon Chemi-Con (KMQ, 560μF, 400V, 105°C). On the primary heatsink we find the two APFC boost diodes (C3D08060) along with two more IPW60R125CP which play the role of the main switches.


In an attempt to increase efficiency, an electromagnetic relay isolates the thermistor that offers protection against high inrush currents, when the PSU starts and the APFC caps are charged.


The PFC/PWM combo controller is the classic CM6800AG. We expected at least the more efficient CM6802 to be used here. Moving to the secondary side synchronous design is used, so the +12V rail is generated by mosfets and to be more specific by eight IPP034NE7N. The minor rails are generated from +12V with the help of two DC-DC Voltage Regulation Modules (VRMs). In each VRM there is an APW7073A PWM controller and two pairs of mosfets. We were able to recognize only one pair of IPD060N03L mosfets.


All filtering capacitors in the secondary side are Nippon Chemi-Con ones and rated at 105°C.


On a vertical daughter-board resides the protections IC, a PS224. This IC supports OCP for up to two +12V channels, so it covers the unit's specifications.


The modular PCB has some places for filtering caps installation, which unfortunately are left empty. That's a pity because ripple/noise suppression would benefit a lot by those caps.


Soldering quality on the main PCB is ok. It may be not top notch but you can't call it bad either.


For last we left the flower-shape fan which is quite noisy, at least at middle-high RPMs, despite its promising design. Its model number is YD121425HB (140mm, 12VDC, 0.54A) and is manufactured by Yen Sun Technology.