Component Analysis

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



This is a new CWT platform made for be quiet!. The design is clean, allowing for good airflow between components, which are nicely spread across and not installed right next to each other. The heatsinks are pretty large for a CWT platform, and typical of the secondary side, there are no heatsinks since the +12 V FETs are installed on a daughter-board.


The transient filter is in two parts, with a single X and two Y caps at the AC receptacle and the second part on the main PCB, including all other components. The MOV is covered in heat-shrink tubing, so it will stay in place if a high power surge destroys it.


The NTC thermistor and bypass relay combination is for suppressing large inrush currents. It doesn't do a great job, though.


The single bridge rectifier is bolted to a beefy heatsink.


ON Semiconductor provides the FETs used in the APFC converter. The same goes for the boost diode. The only downside here is the selection of the low-end Teapo bulk caps with a temperature rating of 85 °C. These are at least large capacity bulk caps to ensure a hold-up time of over 17 ms.


The APFC controller is the Champion CM6500UNX, and there is a FET that isolates the APFC converter while the PSU is in standby mode.


The main FETs are installed in a half-bridge topology.


The LLC resonant controller is a Champion CU6901VAC.


The unit's main transformer is directly connected to the board that hosts the +12 V FETs to minimize energy losses.


The FETs that regulate the +12 V rail are four On Semiconductor NTMFS5C430Ns, while the 750 W unit uses six of those. They are installed on a vertical board close to the main transformer.


Two DC-DC converters generate the minor rails. They use four UBIQ FETs, and the common PWM controller is a UPI Semi uP3861P. The same VRMs are also used in the Pure Power 11 FM 750 W and Corsair RM850x (2021) PSUs.


To keep the cost as low as possible, Teapo and Elite provide the electrolytic caps. I'm not too fond of the Teapo SC caps because of their low lifetime. Like the 750 W model, there are also 18 polymer caps by APAQ, which are much more tolerant to high operating temperatures.


The 5VSB circuit uses a PS1045L SBR on its secondary side, and the standby PWM controller is an On-Bright OB5282 IC. Once the PSU starts, the 5VSB rail takes power from the 5 V rail. This is done through a change-over switch, a Sync Power SPN3006 FET.


Polymer caps cover the face of the modular PCB.


Soldering quality is excellent.


The supervisor IC is a Weltrend WT7527RT. There is also an LM393G dual differential comparator, which is most likely used by the protection features circuit.


The cooling fan is a be quiet! BQ QF2-12025-MS. It has a diameter of 120 mm and uses a rifle bearing. The same fan is used in the 750 W model.