Part Analysis
| General Data | |
| Manufacturer (OEM) | HKC |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor 5D-15 (5 Ohm @ 25°C) & Relay |
| Bridge Rectifier(s) |
2x
|
| APFC MOSFETs |
2x Wayon WML53N60C4 (600V, 26A @ 100°C, Rds(on): 0.07Ohm)
|
| APFC Boost Diode |
1x CH3D160651
|
| Bulk Cap(s) |
2x Nichicon (420V, 390uF each or 780uF combined, 3000h @ 105°C, LGM)
|
| Main Switchers |
4x Wayon WML36N60F2 (600V, 20A @ 100°C, Rds(on): 0.11Ohm)
|
| APFC Controller |
Champion CM6502UHHX
|
| Resonant Controller | Champion CU6901VPA |
| Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 8x Infineon BSC007N04LS6 (40V, 269A @ 100°C, Rds(on): 0.7 mOhm) |
| 5V & 3.3V | 2x DC-DC Converters PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 5x Nippon Chemi-Con (2-5,000h, @ 105°C, KZE) 2x Nippon Chemi-Con (4-10,000h, @ 105°C, KYA) Polymer: 35x no info |
| Weltrend WT7527RA | |
| Fan Model | TT-1225 BDK12025MS (120mm, 12V, 0.30A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
1x PN8141
|
| Standby PWM Controller | PJ1256 |
Contrary to the GF A3 1200W unit, which uses a different platform from the same OEM, HKC, the PCB is overpopulated with parts in this one. The heatsinks are pretty large, which is good, of course, but unfortunately, the fan speed profile doesn’t exploit them since it is too aggressive. What troubles me is the restricted free space between parts, which restricts airflow. The caps on the secondary side are hidden below the 12V heatsink, so they don’t have a clear path to the fan’s airflow, affecting their reliability in the long run.
The build quality is good. HKC used quality capacitors everywhere and Infineon FETs on the secondary side, which will get the most stress. Soldering quality is generally decent, but I found an area on the PCB’s solder side where the finish wasn’t smooth. It looks like this spot was exposed to high temperatures. In any case, it doesn’t affect the PSU’s operation and performance. The cooling fan is by BaoDiKai, and its model number is BDK12025MS. It is supposed to use a fluid dynamic bearing, but I cannot be sure unless I destroy the fan to inspect its bearing. I would highly prefer a Hong Hua fan, but apparently, HKC doesn’t have close relations with this factory, so they either cannot get Hong Hua’s products or the prices are too high.
A full-bridge topology and an LLC resonant converter are used on the primary side. A synchronous rectification scheme is utilized on the secondary side for the 12V rail, along with a pair of DC-DC converters for the minor rails. It is always nice to see Infineon FETs since they are top-quality. On the primary side, HKC went with Wayon FETs, which are not at the same quality level as the corresponding Infineon ones.
