Part Analysis
| General Data | |
| Manufacturer (OEM) | CWT |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 6x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor SCK-037 (3 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x GBJ1506 (600V, 15A @ 100°C)
|
| APFC MOSFETs |
2x Infineon IPA60R125P6 (650V, 19A @ 100°C, Rds(on): 0.125Ohm) &
1x Sync Power SPN5003 FET (for reduced no-load consumption) |
| APFC Boost Diode |
1x Onsemi FFSP0865A (650V, 8A @ 155°C)
|
| Bulk Cap(s) |
2x Nippon Chemi-Con (400V, 470uFeach or 940both, 2000h @ 105°C, KMW)
|
| Main Switchers |
2x Infineon IPA60R190P6 (650V, 12.7A @ 100°C, Rds(on): 0.190Ohm)
|
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller |
Champion CU6901VACNH
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x Toshiba TPHR8504PL (40V, 150A @ 25°C, Rds(on): 0.85mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) PWM Controller(s): UPI Semi uP3861P |
| Filtering Capacitors | Electrolytic: 4x Nichicon (3-6,000 @ 105°C, HD(M)), 3x Rubycon (6-10,000 @ 105°C, ZLH) 1x Rubycon (2-10,000 @ 105°C,YXF) 2x Nippon Chemi-Con (105°C, W) Polymer: 31x FPCAP, 2x Nippon Chemi-Con |
| Fan Controller | Microchip PIC16F1503 |
| Fan Model | Corsair NR140HP (140mm, 12V, 0.33A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| High Side Rectifier |
1x SMC RS1M (1000V, 1A @ 100°C)
|
| Standby PWM Controller | On-Bright OB2365T |
Channel Well Technology provides the platform, the same OEM that manufactured the previous generation of RMx units. CWT also makes the RMx Shift units. The RMx platform is different from the RMx Shift one, which is expected given the different placement of the modular board. The new RMx platform looks overloaded with parts, although the PCB’s dimensions are normal, and several daughter boards are used to save some space. Given the PSU’s efficiency, the heatsinks are large enough to take some burden off the fan’s shoulders for reduced noise output. The electrolytic caps on the secondary side are not blocked from the fan’s airflow, and they are of high quality. Although polymer caps are preferred for ripple filtering because of their increased tolerance to high operating temperatures and their high ripple current ratings, still, their increased cost and reduced capacitance make the electrolytic caps a requirement for every PSU. To cope with increased transient loads, besides a high-speed response, you also need increased capacitance on the secondary side, and that is where the electrolytic caps are required since they offer a high price per capacitance ratio.
The build quality is high, with good parts everywhere and excellent soldering quality on the PCB. The design follows the modern trend, with an APFC converter, half-bridge topology, and an LLC resonant converter on the primary side. On the secondary side is a synchronous rectification scheme for the 12V rail and a pair of DC-DC converters for the minor rails. The PSU also uses a Microchip MCU to control the fan’s speed.
The fan is the usual aspect: the Corsair NR140HP which uses a fluid dynamic bearing that won’t bother you at low speeds.
Hey Aris, thank you for the review. After my long research and your articles, I finally bought this product (it finally arrived in my country). Is it a problem if the 3.3V channel drops below 3.2? If it is a problem, what causes it?