Topology and teardown
As you can see, the modular connections are located directly on the main circuit board (PCB). This minimizes energy losses as no additional connections are required between the modular and the motherboard. The heat sinks are large enough to handle the thermal loads of the platform and there is sufficient space between the components for good air circulation. This means that the cooling fan does not have to spin quickly to dissipate heat from inside the power supply.
The main transformer is surrounded by heat sinks that cool the 12V FETs on the active side of the board. The only daughter boards house the DC-DC converters responsible for the secondary rails. The design is modern and includes a half-bridge topology as well as an LLC resonant converter on the primary side to minimize energy losses. The controllers on the primary side are from Champion, and the APFC FETs are supplied by Oriental Semiconductor, which I am already familiar with from other platforms. Helly uses FETs from Chubese to keep costs down, as well as most of the capacitors on the secondary side. LTec, a capacitor manufacturer, did not have a particularly good reputation according to my brief research on the internet. However, I plan to check these capacitors more closely to see if they are reliable.
The fan, a crucial component that significantly affects the reliability of a power supply, is supplied by Hong Hua. It uses a fluid dynamic bearing, which ensures a long service life under normal operating conditions. In conclusion, the soldering quality is sufficiently good and will not cause any performance or reliability problems.
Component overview
Finally, I have listed all the components used for interested readers:
| General Data | |
| Manufacturer (OEM) | Helly Technology |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 2x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor MF73T-2 20/7 (20 ohm) & Relay |
| Bridge Rectifier(s) |
2x GBU15J (600V, 15A @ 100°C)
|
| APFC MOSFETs |
2x Oriental Semiconductor OSG65R099HT3ZF (650V, 25.3A @ 100°C, Rds(on): 99mOhm)
|
| APFC Boost Diode |
1x Sanan SDS065J010C3 (650V, 10A @ 155°C)
|
| Bulk Cap(s) |
1x TDK (420V, 1,000uF, 2,000h @ 105°C, EPCOS)
|
| Main Switchers |
2x FuXin Semiconductor FXN45N50T (500V, 16.7A @ 100°C, Rds(on): 0.20Ohm)
|
| Resonant Controller |
Champion CM6901T6X
|
| APFC Controller |
Champion CM6500UNX
|
| Topology |
Primary side: APFC, Half-Bridge & LLC Resonant converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary side | |
| 12V MOSFETs | 8x Huayi HYG009N04LS1C2 (40V,233A @ 100°C, Rds(on): 0.96mOhm) |
| 5V & 3.3V | DC-DC Converters: 2x XSEMI XP3NA3R4MT (30V, 46A @ 100°C, Rds(on): 3.4mOhm) & 2x Rectron Semiconductor RMN3N5R0DF (30V, 19.7A @ 70°C, Rds(on): 5mOhm) PWM Controller(s): 2x Anpec APW7073 |
| Filtering Capacitors | Electrolytic: 11x Ltec (2-5,000h @105°C, LXY) 3x Ltec (4-7,000h @105°C, LZG) 1x CS (3,000h @105°C, WE) Polymer: 21x Beryl BC, 4x Chengx(PC) |
| Supervisor IC | Weltrend WT7527RA (OVD, PGO, UVD, OCD) |
| Fan Model | Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan) |
| 5VSB | |
| Rectifier(s) |
P6SMB (220V, 1A) & 1x Dongke Semiconductor DK5V60R20S
|
| Standby PWM Controller |
Excelliance MOS EM8569C
|
- 1 - Introduction, overview and technical data
- 2 - Unboxing, cables and protective circuits
- 3 - Teardown: Topology, components, processing
- 4 - Load Regulation, Ripple Suppression
- 5 - Transient Response
- 6 - Hold-Up Time, Timings, Inrush-Current
- 7 - Average Efficiency and PF
- 8 - Operating noise and fans
- 9 - Summary and conclusion
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