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 SCK-207R0 (7 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x WNB2560M (600V, 25A @ 127°C)
|
| APFC MOSFETs |
3x Infineon IPW60R099P6 (650V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
| APFC Boost Diode |
1x OnSemi FFSP1665A (650V, 16A @ 135°C)
|
| Bulk Cap(s) |
1x Rubycon (420V, 820uF , 2000h @ 105°C, MXE)
|
| Main Switchers |
2x Infineon IPW60R099P6 (650V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
| APFC Controller | |
| Resonant Controller |
Champion CU6901VAC
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 10x Infineon BSC014206NS (60V, 152A @ 100°C, Rds(on): 1.45mOhm) |
| 5V & 3.3V | DC-DC Converters: 2x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm) & 2x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) PWM Controller(s): uPI-Semi uP3861P |
| Filtering Capacitors | Electrolytic: 1x Elite (2,000 @ 105°C, PF), 7x Chengx (6-10000 @ 105°C, GR), Polymer: 15x Apaq , 10x Elite, 2x |
| Supervisor IC | Weltrend WT7502 (OVD ,PGO, UVD, ) |
| Fan Model | Hong Hua HA13525H12SF-Z (135mm, 12V, 0.5A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| High Side Rectifier |
Chongqing-Pingwei-Tech R1MF (700V, 1A @ 90°C)
|
| Standby PWM Controller | On-Bright OB2365T |
The OEM is Channel Well Technology (CWT), and the platform’s code name is CSZ. This is the same platform many ATX v3.x compliant models use since it was among the first to support the demanding transient response loads that this spec introduced. The platform uses analog controllers for all circuits. We find a half-bridge topology and an LLC resonant converter on the primary side. The secondary side utilizes a synchronous rectification scheme with ten Infineon FETs generating the 12V rail and two VRMs for the minor rails. The cooling fan is by Hong Hua and uses a fluid dynamic bearing, so it won’t have any issues in the long run if you don’t push it hard at high temperatures above 40 degrees Celsius. Lastly, the build quality is decent; the same goes for the soldering quality. At the solder side of the PCB, CWT also enhanced some PCB traces with copper plates for better conductivity and lower power losses at high loads.
The bulk capacitor is by Rubycon, so its quality is unquestionable. On the secondary side, we find lower-cost caps by Chengx and Elite and many polymer caps. For those of you wondering about the quality of Chengx and Elite caps, I can assure you that it is good since the first makes caps for large-cap manufacturers, including some famous Japanese brands, while Elite caps score pretty high so far in my tests.
I have analyzed CWT’s CSZ platform numerous times in past reviews, so there is no point in repeating the same information here. Let’s move to the performance section.
