|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|
2x GBU2506L (600V, 25A @ 100°C)
2x WayOn WML53N60C4 (600V, 26A @ 100°C, Rds(on): 0.07Ohm)
|APFC Boost Diode||
2x Rubycon (420V, 470uF each or 940uF combined, 3000h @ 105°C, MXK)
4x WayOn WML36N60F2 (600V, 20A @ 100°C, Rds(on): 0.11Ohm)
|Resonant Controller||Champion CU6901VPA|
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
|5V & 3.3V||2x DC-DC Converters
PWM Controller(s): ANPEC APW7159C
|Filtering Capacitors||Electrolytic: 5x Nippon Chemi-Con (2-5,000 @ 105°C, KZE)
2x Nippon Chemi-Con (4-10,000 @ 105°C, KYA)
Polymer: 35x no info
|Supervisor IC||Weltrend WT7527RA|
|Fan Model||TT-1225 BDK12025MS (120mm, 12V, 0.30A, Fluid Dynamic Bearing Fan)|
|Standby PWM Controller||PN8141|
Contrary to the GF A3 1050W unit, which uses a different platform from the same OEM, HKC, the PCB is overpopulated. The heatsinks are pretty large, helping the fan speed profile to be more relaxed without jeopardizing the PSU’s reliability. What troubles me is the restricted free space between parts, which doesn’t help 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, including the secondary side where stress is higher. Soldering quality is flawless; the same goes for the PCB’s coating. 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. The 1200W unit used Infineon FETs, so most likely, this one will use the same manufacturer (I couldn’t identify them). On the primary side, HKC went with Wayon FETs, which are not at the same quality level as the corresponding Infineon ones.