Part Analysis
| General Data | |
| Manufacturer (OEM) | Helly Technology |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 3x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor MF72 10D-20 (10 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x
|
| APFC MOSFETs |
2x Oriental Semiconductor OSG55R190F (550V, 12.5A @ 100°C, Rds(on): 0.19Ohm)
|
| APFC Boost Diode |
1x WeEN BYC10X-600P (600V, 10A @ 61°C)
|
| Bulk Cap(s) |
1x Nichicon (400V, 560uF @ 105°C, GN(M))
|
| Main Switchers |
2x Perfect PTA25N50 (500V, 16A @ 100°C, Rds(on): 280mOhm)
|
| 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 Fuxin Semiconductor FXN0204C (40V, 210A @ 100°C, Rds(on): 2.0mOhm) |
| 5V & 3.3V | DC-DC Converters: 2x XSEMI XP3NA3R4MT (30V, 46A @ 100°C, Rds(on): 3.4mOhm) 2x Rectron Semiconductor 3N5R0 (30V, 19.7A @ @ 70°C, Rds(on): 5mOhm) PWM Controller(s): 2x ANPEC APW7073 |
| Filtering Capacitors | Electrolytic: 2x Nippon Chemi-Con @ 105°C, (W), 1x Nippon Chemi-Con (2-5,000 @ 105°C, KZE) 3x Rubycon (4-10,000 @ 105°C, YXJ) 1x Rubycon (4-10,000 @ 105°C, YXF) 1x Rubycon (3-6,000 @ 105°C, ZLQ) Polymer: 35x Apaq |
| Supervisor IC | Weltrend WT7527RA (OVD, PGO, UVD, OCD) |
| Fan Model | Yate Loon D12SH-12 (120mm, 12V, 0.30A, Sleeve Bearing Fan) |
| 5VSB | |
| High Side Rectifier |
P6SMB (220V, 1A)
|
| Standby PWM Controller | Excelliance MOS EM8569C |
A quick look shows that the 1000W and 1200W models use a different platform (ATX0800GB) from the lower capacity units (ATX0500GB).
The OEM is Helly Technology, the mother company of 1st Player. The PCB is small but not densely populated with parts. The overall design is clean, without any cables blocking the airflow. A heatsink is next to the main transformer, hosting the FETs that regulate the 12V rail. There is nothing important to see on the PCB’s backside since Helly prefers to solder most parts on the other side.
The soldering quality is satisfactory, and the capacitors that Helly used are of high quality. The FETs don’t belong to tier #1 manufacturers, but they will do the job. The cooling fan is by Yate Loon and is of low quality, especially compared to the Hong Hua fans that the 1200W and 1000W members of the line use. Besides the APFC converter, we find a half-bridge topology and an LLC resonant converter on the unit’s primary side. On the secondary side, a synchronous rectification scheme generates the 12V rail, which feeds a pair of DC-DC converters that generate the minor rails. These converters are installed on vertical boards to occupy less space.
It is good to see a new ATX v3.1 platform by a less popular OEM since it provides more brand choices. So far, CWT had the lion’s share in the ATX v3.0 and v3.1 PSUs with its trendy CSZ platform, but new designs are starting to emerge, trying to share a piece of the market pie. I guess this will push CWT and the rest of the big OEMs to improve their products further, and we will finally start to see price reductions as the competition gets more challenging.
