Part Analysis
| General Data | |
| Manufacturer (OEM) | CWT |
| Platform | CTF |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor SCK-25150 (15 Ohm) & Relay |
| Bridge Rectifier(s) |
1x WeEn WNB2560M (600V, 25A @ 127°C)
|
| APFC MOSFETs |
4x (AC Rectification) + 2x Infineon IMW65R050M2H (650V, 27A @ 100°C, Rds(on): 62mOhm) &
1x Sync Power SPN5003 FET (for reduced no-load consumption) |
| APFC Boost Diode |
2x Vishay VS-3C10ET07T-M3 (650V, 10A @ 140°C)
|
| Bulk Cap(s) |
2x Nippon Chemi-con (420V, 770uF each or 1,540uF combined, 2,000h @ 105°C, KHE)
|
| Main Switchers |
4x Alpha & Omega AOTF29S50L (500V, 18A @ 100°C, Rds(on): 0.15Ohm)
|
| IC Driver | 2x Novosense NSi6602 |
| Digital Controller | 2x Texas Instruments UCD3138A |
| Topology | Primary side: Semi-Digital, Interleaved Bridgeless PFC, Full-Bridge & LLC Resonant converter Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 12x |
| 5V & 3.3V | DC-DC Converters: 4x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) |
| Filtering Capacitors | Electrolytic: 5x Nippon Chemi-Con (@ 105°C, W) 3x Rubycon (4-10,000h @ 105°C,YXJ) 3x Rubycon (6-10,000h @ 105°C, ZLH) Polymer: 21x Nippon Chemi-Con, 21x FPCAP |
| Supervisor IC | IN1S3151-SAG |
| Fan Controller | Nuvoton M032LD2AE |
| Fan Model | ZIC ZFF132512H BAX3 (135mm, 12V, 0.45A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
1x Leadtrend LD8926AA1 Synchronous Rectification IC
|
| Standby PWM Controller | On-Bright OB2365T |
This is a new platform by CWT with the codename CTF. The PCB is large enough to accommodate all required parts, including two parallel main transformers, and has a unique design. Since there wasn’t enough space for a large one, CWT had to use two smaller ones in a parallel configuration. Besides better space management, such a configuration can lead to lower power losses.
Despite the unit’s high capacity, the heatsinks are not large, and this troubles me a bit since the fan speed profile, in my sample at least, is too relaxed. Unfortunately, I don’t have the time or the mood to perform a complete thermal analysis, install 20-30 thermal probes inside the PSU in key components, and run an extended full load test at 45-50C to find out whether the fan speed profile is tuned correctly or this is a golden sample. The platform’s high efficiency minimizes energy losses, which greatly helps since the thermal load that the cooling, both passive and active, has to handle is lower. But in any case, you have to be careful, especially with a PSU that has a 12-year warranty.
The 12V rail is generated through 12x FETs installed on the PCB’s top side and cooled down by some heatsinks. The same rail also feeds a pair of DC-DC converters, which generate the minor rails. Fully desoldering this platform makes it easier to identify all its parts, but I didn’t want to do that since I need it to remain fully operational for future testing.
The build quality is high; the same goes for the soldering quality. CWT used Japanese caps everywhere, both electrolytic and polymer, and the bulk caps have enough combined capacity, at 1540uF, to provide a longer than 17ms hold-up time. Other high-end 1600W PSUs have even larger bulk caps; for example, the Seasonic TX-1600 is close to 2500uF. In this MSI unit, a single NTC thermistor is used to suppress high inrush currents.
The cooling fan is by ZETA, which wins more ground as time passes, thanks to its decent quality and reasonable prices. When Hong Hua fans started to get expensive, ZETA won more customers. I must throw this fan on the Longwin machine to learn more about its performance.
When I saw the fan curve of this PSU from the Cybenetics report, I wasn’t expecting such a poor cooling solution for this PSU! With far better built (and cheaper!) noise-optimized ATX 3.1 PSUs in the market like the Seasonic Prime Noctua TX-1600 or the Cooler Master Silent X Platinum 1300, I really don’t see the point in throwing $699 USD for a PSU that doesn’t even come with fan failure protection.
Such a dissapointing PSU from MSI…
NZXT with price around $369 (it’s around $329 in Indonesia) outclassed MSI MEG A1600T with its price around $700
Really, MSI?