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.


The OEM is Channel Well Technology (CWT) and this can be easily verified by the green transformers.


The first stage of the EMI/transient filtering stage starts at the AC receptacle with one X and two Y capacitors. It continues to the main PCB with one X and two Y caps, two coils and an MOV. Afterwards there is a GBU806 bridge rectifier, which is not attached to a heatsink. Right next to the bridge rectifier resides a vertical daughter-board which houses the classic CM6800 combo PFC/PWM controller. In the APFC stage two mosfets and a boost diode are used to separate the intermediate DC voltage into constant pulse sequences. These pulses are smoothened afterwards by the APFC capacitor, which is provided by Samxon (85°C, 180μF, 400V). As primary switches two AOT10N60 mosfets are used.


In the secondary side passive design is used, so two 40U60CT Schottky Barrier Rectifiers (SBRs) handle +12V. The other two minor rails, 5V and 3.3V, are generated by two MBR2535CTG SBRs. The presence of only two toroidal chokes indicates that group regulation is used. The bigger choke is shared by 12V/5V and the smaller is used by 3.3V. All filtering capacitors in the secondary side are a mix of Teapo and Samxon ones and all are labeled at 105°C. In the secondary side also resides the protections IC, an ST9S429, for which we could not locate any datasheet. Finally, we found a thermistor attached on the secondary heatsink, for the control of the fan's RPMs.


Three optocouplers, instead of a small transformer, provide electrical isolation between the primary and the secondary side.


Soldering quality on the main PCB is fairly good, especially for a PSU of this category/price.


The fan is provided by Yate Loon Electronics and its model number is D12SH-12 (12V, 2200RPM, 88CFM, 40dB). It uses sleeve bearing.