Part Analysis
| General Data | |
| Manufacturer (OEM) | CWT |
| Platform | GPX |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 2x Y caps,2x X caps, 2x CM chokes, 1x MOV,1x Power Integrations CAP200DG (discharge IC) |
| Inrush Protection | NTC Thermistor SCK-056 5Ohm & Relay |
| Bridge Rectifier(s) |
1x Diodes GBU1506 (800V, 15A @ 125°C)
|
| APFC MOSFETs |
2x Great Power GP28S50 (500 V, 28 A @ 150 °C, Rds (on): 0.125 ohm) & |
| APFC Boost Diode |
1x CRMICRO CRXI06D065G2 (600V, 6A @ 167°C)
|
| Bulk Cap(s) |
1x CapXon (420V, 560uF, 2000h @ 105°C, HP)
|
| Main Switchers |
4x Silan Microelectronics SVF20N50F (500 V, 12.6 A @ 100 °C, Rds (on): 0.27 ohm)
|
|
MCU |
1x Texas Instruments LM393 |
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller | Champion CM6901X |
| Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x Infineon BSC014N04LS (40V, 107A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm)
PWM Controller: ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 10x Elite (2,000h @ 105°C, PF), 5x CapXon (2-5,000 @ 105°C, KF), Polymer: 27x CapXon |
| Supervisor IC | IN1S429I – DCG |
| Fan Model | Martech DF1202512FDHN (120mm, 12V, 0.42A, Fluid Dynamic Bearing Fan) |
| Standby PWM Controller | Power Integrations TNY287PG |
These CWT’s GPX platform upgraded to the ATX v3.0 and PCIe 5.0 transient response requirements. On the primary side, a full-bridge topology is used instead of a half-bridge one. Since full-bridge is more expensive, CWT used four affordable main switching FETs. This way, the total cost of these four FETs is lower than that of two higher-quality ones. On the secondary side, all FETs are of high quality since there is no room for downgrades there.
The PCB is small, but there is still plenty of space between parts for efficient cooling. Unlike other CWT platforms, this one has heatsinks on the secondary side. These two heatsinks cool down the FETs generating the +12V rail, which are installed on the PCB’s solder side. Speaking of the solder side, soldering quality is generally good. The build quality is decent. MSI didn’t use top-notch parts, on the primary side and part of the secondary side, to keep the cost down. However, the Elite caps on the secondary side won’t have a problem outliving the product’s warranty under normal operating conditions. When there is no budget for Japanese caps, Elite and Teapo caps are the best alternatives.
I would prefer if MSI used a better fan. Yes, it has a fluid dynamic bearing, according to its manufacturer, but a Hong Hua fan would be way better.
