Part Analysis
| General Data | |
| Manufacturer (OEM) | Helly Technology |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 2x Y caps, 1x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor MF73T-1 & Relay |
| Bridge Rectifier(s) |
1x GBU 1508 (800V, 15A @ 100°C)
|
| APFC MOSFETs |
2x Oriental Semiconductor OSG55R190F (600 V, 12.5 A @ 100 °C, Rds (on): 0.19 ohm)
|
| APFC Boost Diode |
1x WeEN BYC10X-600P (600V, 10A @ 61)
|
| Bulk Cap(s) |
1x Nippon Chemi-Con (400V, 680uF, 2000h @ 105°C, KMR)
|
| Main Switchers |
2x FuXin Semiconductor FXN28N50F (500V, 16.7A @ 100°C, Rds(on): 0.2Ohm)
|
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller |
Champion CM6901T6X
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 4x AllPower APG013N04G (40V, 100A @ 100°C, Rds(on): 1.3mOhm) |
| 5V & 3.3V | DC-DC Converters: 2x XSEMI XP3NA3R4MT (30V, 46A @ 100°C, Rds(on): 3.4mOhm) & 2x RMN3N5R0DF (30V, 19.7A @ 70°C, Rds(on): 5mOhm) PWM Controller(s): 2x ANPEC APW7073 |
| Filtering Capacitors | Electrolytic: 3x Rubycon (2-1,0000 @ 105°C, YXF), 2x Nippon Chemi-Con @ 105°C, (W), 2x Nippon Chemi-Con (2-5,000 @ 105°C, KZE) Polymer: 31x Beryl BC |
| Supervisor IC | Weltrend WT7527RA (OCP, OVP, UVP, SCP, PG) |
| Fan Model | Hong Hua HA1225M12F-Z (120mm, 12V, 0.45A, Fluid Dynamic Fan) |
| 5VSB | |
| Standby PWM Controller |
Excelliance MOS EM85690
|
The small PCB is relatively loaded with parts, especially on the secondary side. Two heatsinks surround the main transformer, used to cool down the 12V FETs, which are installed on the PCB’s surface at its top side so they are in direct contact with the fan’s airflow. There is little to see on the PCB’s backside except for the good soldering quality and a pair of shunt resistors.
On the primary side, in addition to the APFC converter, we also find a half-bridge topology and an LLC resonant converter for lower switching losses. On the secondary side, a synchronous rectification scheme handles the 12V rail, with four FETs total, and the minor rails are generated through a pair of DC-DC converters.
Overall, the build quality is good, with Chemi-Con bulk caps, Rubycon and Chemi-Con filtering caps on the secondary side, and Champion controllers. The cooling fan is by Hong Hua, and it uses a fluid dynamic bearing, so it will last long under normal operating conditions. In the 1000W model I reviewed a terrible Yate Loon fan was used, so it is very good to see Helly changing that part with a much better one.
Does it feature two 12v-2×6 slots but only one cable?