Page 3 - Physical Look - Inside
As usual, we opened up our Cooler Master V SFX Platinum 1100W power supply to take a detailed look at what is going on inside. Please note that doing this at home will void your 10-year warranty, thanks to the warranty seal Cooler Master applied over one of the attachment screws. For your benefit, we opened ours up, so you do not need to. There are no user serviceable parts inside.
Opening the Cooler Master V SFX Platinum 1100W is quite straightforward with the removal of four screws. Taking out the internal components from the enclosure requires the removal of even more screws afterwards. The OEM for this power supply is Sysgration. This manufacturer was founded in 1977 in Taiwan. While we have not seen many units from them in the past before, everything seems to be in the right order, at least from initial impressions. It features a full-bridge LLC topology with DC-to-DC converters. At first glance, the build quality appears to be excellent. There are two silver main heatsinks inside and only a few wires around the internals. All of them are located on the primary side.
Starting with the transient filter stage, there are three X-capacitors and four Y-capacitors near or around the AC receptacle. This is at least two times the amount of X and Y capacitors than recommended. In addition, we have two common mode chokes and a metal oxide varistor. The MOV helps with suppressing voltage spikes. Considering some modern-day PSUs have missing MOVs, I am happy to see it here.
The active PFC circuit featured on the Cooler Master V SFX Platinum 1100W uses one Vishay GBUE2560 bridge rectifier on one side of the large primary heatsink. At 115V, the maximum rectified forward current capacity with heatsink is 25A each, so you can theoretically pull up to 2875W (25A * 115V) from the bridge rectifier at 100% efficiency. Of course, this is limited by the fact that it is not 100% efficient and also neglects the fact that not every component in the system is able to keep up.
Further down the line, we can see two active PFC MOSFETs and a boost diode. Unfortunately, they are squished beside other components so getting any visibility on the markings is nigh impossible. This is no surprise considering the small size of this PSU. Near the same heatsink, there are four switcher MOSFETs on a separate daughterboard. These are near the primary capacitor, and these are the Infineon IPL60R095CFD7. Each of these are certified for up to 16A at 100c. These transistors present a maximum resistance of 95mΩ when turned on according to the manufacturer's data sheet. This on characteristic is called Static Drain-Source On-Resistance, or commonly abbreviated as RDS(on). The more efficient the component is, the lower the RDS(on) value, since it wastes less power with lower resistance. Champion's CU6510VC is the switching controller, located underneath the main PCB.
As for the primary capacitor, you can see one TDK EPCOS B43647. This capacitor was fully wrapped in a rubber cover and shielded by a metal heatsink, but I was able to get the model from one edge. Otherwise, third-party certifications show this has 800µF x 450V of capacitance. It is rated at 105c, whereas more value-oriented power supplies usually use 85c rated capacitors. While TDK Corporation is a Japanese company, EPCOS, the original company, was headquartered in Germany. TDK acquired this company and it still operates at its original location by the name TDK Electronics AG.
On the secondary side, we can see more Japanese-originated electrolytic capacitors from United Chemi-Con, a subsidiary of Nippon Chemi-Con, and Unicon rated at 105c. All of the polymer capacitors are also made by the two aforementioned companies, as well as Toshin Kogyo. Cooler Master does state we have 100% Japanese capacitors in this unit, and it does indeed seem to be the case.
All rectifiers produce the +12V out, while the +5V and +3.3V outputs are generated from the +12V output using a DC-to-DC converter within the power supply unit. A total of ten Infineon BSC007N04LS6 MOSFETs generate the +12V output and are located on a daughterboard near the secondary side of the transformer. Its rated continuous drain current is 269A at 100c. It has an RDS(on) value of 0.7 mΩ maximum and 0.62mΩ typical at 10V.
On a yet another add-in board, we have MOSFETs that generate the +5V and +3.3V output from the +12V rail. This includes six Infineon BSC0901NS. These act as the DC-to-DC converter. The BSC0901NS has a drain to source current of 94A at 100c, with an RDS(on) of 1.9 mΩ and a typical resistance of 1.6 mΩ at 10V. Two ON Semiconductor NCP1589A can be found on the same board for PWM control. Other components on other add-in boards include a Weltrend WT7502R monitoring IC, which provides overvoltage, undervoltage, and short circuit protection, as well as the power good signal.
On the underside of the PCB, we can find even more component, including a Power Integrations INN3165C standby PWM controller, an Infineon BSC0702LS 5VSB rectifier, and a Novosense NSi824x digital isolator. The datasheets for all of the components mentioned in the inspection should be found on their respective manufacturer's website.
Looking at the output, we have a large daughterboard covering the majority of the rear panel for the modular cable sockets. All of the sockets are soldered directly to the main PCB after the secondary stage. Pin headers join the mainboard and daughterboard to reduce power transmission loss. The output connector configuration can be seen on the previous page. There are a couple more electrolytic capacitors found here too.
Overall build quality of this Sysgration unit is quite good. Components are arranged as well as they can be in this tight enclosure, with heatsinks in necessary areas to disperse heat on the hotter components. As well, you can see one large heatpad to use the enclosure as a larger heatsink. There are very few cables running around inside and solder points on this black PCB are quite clean in general. Component choices here are of excellent quality and specifications for this power output and efficiency.
Mounted to the outer shell of the Cooler Master V SFX Platinum 1100W is a 92mm fan to provide cooling to the internals. This is connected via an add-in board with a 2-pin connector. The model of the fan is Hong Hua HA9215SH12FD-F00, which is a fluid dynamic bearing fan specified at 0.46A. Fluid dynamic bearing fans generally have a longer lifespan compared to sleeve bearing fans, making it quite fitting for a power supply intake fan. Unfortunately, we do not have a zero-RPM mode on this power supply unit, so it is beneficial to use a fan with quieter bearings, such as fluid dynamic bearings.
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion