Part Analysis
| General Data | |
| Manufacturer (OEM) | Sirfa |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Discharger IC HF81 |
| Inrush Protection | 1x NTC Thermistor & Relay |
| Bridge Rectifier(s) |
1x
|
| APFC MOSFETs |
1x Infineon IPW60R037P7 (650V, 48A @ 100°C, Rds(on): 0.037Ohm)
|
| APFC Boost Diode |
1x Toshiba TRS8E65F (650V, 8A @ 25°C)
|
| Bulk Cap(s) |
1x Rubycon (420V, 560uF, 2,000h @ 105°C, MXT)
|
| Main Switchers |
2x Wuhan Xinyuan CWS60R099BF (600V, 25A @ 100°C, Rds(on): 0.099Ohm)
|
| APFC Controller |
Infineon ICE3PCS01G
|
| Resonant Controller |
Champion CU6901VAC
|
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x Toshiba TPHR8504PL (40V, 150A @ 25°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 6x Infineon BSC0906NS (30V, 40A @ 100°C, Rds(on): 4.5mOhm) PWM Controller(s): 1x Upi-Semi UP3861P |
| Filtering Capacitors | Electrolytic: 5x Rubycon (6-10,0000 @ 105°C, ZLH) 3x Rubycon (3-6,0000 @ 105°C, YXG) Polymer: 14x FPCAP, 1x Rubycon YXG, 7x Nippon Chemicon |
| Supervisor IC | Weltrend WT7527RA (OVD, PGO, UVD) |
| Micro-Controller / Fan controller | STC15W408AS |
| Fan Model | Globe Fan S0921512HHB (92mm, 12V, 0.5A, Fluid Dynamic Bearing Fan) |
| 5VSB | |
| Rectifier |
2x Vishay RS1D (140V, 30A @ 150°C)
|
| Standby PWM Controller | SI8016HSP8 |
All Sharkoon SFX units are made by Sirfa/High Power, and this is easy to find by noticing the distinctive design of the primary heat sink. Given the restricted PCB space, the primary heat sink is quite large. The 12V FETs are installed on the solder side of the PCB, close to the main transformer, to minimize energy losses during power transfer. The platform’s design is clean enough, and Sirfa used several vertical boards to save space.
A half-bridge topology and an LLC resonant converter are used on the primary side. On the secondary side, six Toshiba FETs regulate the 12V rail. A pair of VRMs generate the minor rails and receive power from the 12V rail. The build quality is generally high, with FETs provided by known manufacturers, with the only exception of the main ones and capacitors by Japanese brands. The soldering quality is also good. My only objection to this unit’s build quality is the fan, provided by Globe Fan, a manufacturer a little above Yate Loon, among the lowest quality fan manufacturers. Sirfa should use a Hong Hua fan instead or another one with similar quality. According to the official specs, the fan uses at least a fluid dynamic bearing, but the manufacturing quality matters most besides the bearing type.
The transformer’s visual impact is remarkable, but it is the optical effect compared to the size of the power supply. Seeing 1200w from such a small 850w power supply always makes a certain sense.