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 MF72 10D-15 (10 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x GBU1508 ((560V, 15A @ 100°C)
|
| APFC MOSFETs |
2x PTA28N50 (500V, 18A @ 100°C, Rds(on): 0.21Ohm)
|
| APFC Boost Diode |
1x WeEN BYC15X-600P (600V, 10A @ 25°C)
|
| Bulk Cap(s) |
1x Chengx (420V, 470uF @ 105°C, LS)
|
| Main Switchers |
2x PTA28N50 (500V, 18A @ 100°C, Rds(on): 0.21Ohm)
|
| PFC/PWM Controller |
Champion CM6800UX
|
| Topology |
Primary side: APFC, Double Forward
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 3x Oriental Semiconductor SFS06R03PF (60V, 160A @ 25°C, Rds(on): 3.5mOhm) |
| 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: 10x Chengx (2-3,000 @ 105°C,GR), Polymer: 9x Apaq |
| Supervisor IC | Infinno IN1S429I-SCG (OCP, OVP, UVP, SCP, PG) |
| Fan Model | WAM W12025HZ12SEMA (120mm, 12V, 0.25A, Hydraulic Bearing Fan) |
| 5VSB | |
| High Side Rectifier |
P6SMB (220V, 1A)
|
| Standby PWM Controller | Excelliance MOS EM8564A |
The OEM is Helly Technology, which is starting to impact the PSU market by collaborating with more brands. It is good to see more factories and OEMs entering the game since they can lower the prices. This older design uses a double-forward topology on the primary side, which was popular several years ago when most PSUs were Bronze-rated. Despite the budget price, the PCB is double-sided, which is a pleasant surprise. The soldering quality is good, and the parts that Helly used do not belong to top-tier manufacturers to keep the production cost under tight control. The bulk cap is by Chengx, which belongs to the Chinese government. Hence, it has enough money to spend on equipment, and the electrolytic caps on the secondary side are by the same manufacturer. Moreover, nine polymer caps are also used for ripple filtering.
On the secondary side, a synchronous rectification scheme is used, with three FETs handling the 12V rail and a pair of DC-DC converters generating the minor rails. Last, I left the cooling fan, provided by an unknown brand, at least to me. It is supposed to have a hydraulic dynamic bearing, but since this is the most expensive bearing, I highly doubt it.
