Part Analysis
| General Data | |
| Manufacturer (OEM) | CWT |
| Platform | CSZ |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 1x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor SCK207R0 (7 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x Yangjie GBJL2506 (420V, 3.5A @ 25°C)
|
| APFC MOSFETs |
3x Infineon IPB50R140CP (550V, 15A @ 100°C, Rds(on): 0.14Ohm)
|
| APFC Boost Diode |
1x Vishay 3C16ET07T (650V, 16A @ 142°C)
|
| Bulk Cap(s) |
1x Teapo (420V, 820uF, 2000h @ 105°C, LS)
|
| Main Switchers |
2x Infineon IPP60R099C6 (650V, 37.9A @ 25°C, Rds(on): 0.099Ohm)
|
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller |
Champion CM6901X
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 10x Vishay R626 (60V, 100A @ 25°C, Rds(on): 1.7mOhm) |
| 5V & 3.3V | DC-DC Converters: 2x Excelliance Mos B04N03 (30V, 75A @ 25°C, Rds(on): 4mOhm) 2x On Semiconductor ON3107335 (20V, 8.3A @ 25°C, Rds(on): 12.2mOhm) PWM Controller(s): 1x uP3861P |
| Filtering Capacitors | Electrolytic: 7x Chengx (2-3000 @ 105°C, GR), Polymer: 7x Nippon Chemi-Con, 5x CapXon ,15x AP-Con |
| Supervisor IC | Weltrend WT7502 |
| Fan Model | Hong Hua HA13525H12SF-Z (135mm, 12V, 0.5A, Fluid Dynamic Bearing Fan) |
| 5VSB | |
| High Side Rectifier |
R1MF (700V, 1A)
|
| Transient Voltage Suppressor | |
| Standby PWM Controller | B2365T |
This is the omnipresent CWT CST platform, which I have analyzed in many reviews. The heatsinks on the primary side are small, and there are none on the secondary side since the 12V FETs are installed on a daughterboard. Although the platform is powerful and the PCB is small, thanks to the good design, it is not so densely populated, especially on the primary side. Besides the typical APFC converter, CWT used a half-bridge topology and an LLC resonant converter for lossless switching on the primary side. A synchronous rectification scheme is used on the secondary side, with ten FETs regulating the 12V rail. The same rail feeds a pair of DC-DC converters, which generate the minor rails. The filtering caps are by Chengx, which belongs to the Chinese government, so it has unlimited resources, and the polymer caps are by Chemi-Con, CapXon, and AP-Con.
The cooling fan is by Hong Hua, which established a good name in the PSU market. I don’t like the non-linear speed of these fans at lower voltage input, but they have been proven reliable so far, and their prices are fair, so most manufacturers prefer them over lower-quality fans from Yate Loon and Globe Fan.
All in all the build quality is good, with Infineon and Vishay FETs used and the same goes for the soldering quality.
