Page 3 - Physical Look - Inside
In order to further investigate the design details of the FSP Vita GM 1000W power supply unit, some panel removal is required. It is important to note two important concerns before disassembling any power supply unit. First, certain components, such as the capacitors, may cause an electrical shock if not discharged properly. Second, your 10-year warranty can be voided. Therefore, unnecessary disassembling of a power supply unit should be avoided. Once the top panel of the Vita GM is removed, a closer look of the electronic components can be revealed.
The OEM for the power supply is themselves, which is not surprising, considering FSP is a major OEM. Our photo above shows an overhead view of its internal components. It features an LLC full bridge topology with DC-to-DC converters. At first glance, the build quality appears to be excellent. There are three main heatsinks inside, all of them painted black, and almost no wires flying around.
Let us first take a look at the transient filter stage of the power supply unit. The function of the transient filter stage is to protect the computer from the power grid noise and voltage spikes. In the FSP Vita GM 1000W power supply unit, the transient filter stage contains two X-capacitors, four Y-capacitors, two common mode chokes, and one metal oxide varistor. The MOV here is to prevent the computer from being damaged by lightning surges. It is worth mentioning not all the power supply units in the market have an MOV. There are two sets of X-capacitors and Y-capacitors, with one set on the PCB board behind the power plug and the other set found on the main PCB board.
Now, we move on to the primary side. The one big capacitor in the photo is from Nippon Chemi-con, which is rated at 680uF at 450V. The temperature is rated at 105c, which is the standard in terms of durability. This one is a Japanese-brand capacitor, which costs more than those designed elsewhere, but the quality is better. For the standby PWM control, there is a Grenery GR9230UK. By the left-hand side of the transformer in the photo, there is a pair of heatsink panels. On each heatsink, two Toshiba TK25A60X5 MOSFET transistors are used as the main switchers. Each is certified for up to 25A at 25c and typical resistance of 120 mΩ according to the manufacturer's data sheet.
On another heatsink besides the MOSFET heatsink, there are two rectifying bridges attached to that heatsink. From what I can see, the rectifying bridge is a Diodes Incorporated GBU2508. At 115V, the maximum rectified forward current capacity with heatsink is 25A, so you can theoretically pull up to 5750W (2 * 25A * 600V) 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 are able to keep up.
On the left side of the transformer, there is a large heatsink, where you can find a pair of Greatpower GP36S60YERD as the APFC MOSFETs. I was not able to find the datasheet of the GP36S60YERD. There is also a Toshiba TRS8E65F as the APFC boost diode. The IC for APFC control is the Champion CM6500UNX.
The electrolytic capacitors on the secondary side are also Japan brand, and they are rated at 105c. These polymer capacitors are a mix from Japanese and Taiwanese brands. In our case, there are Chemi-Con and APAQ. For a modern power supply unit, the power output from the rectifiers is +12V. Six Toshiba TPH1R204PL are responsible for generating +12V, and they can provide current up to 150A continuously at 25c with a typical resistance of 1.0 mΩ. The +12V output of the power supply unit can just directly use the power from the rectifiers. However, the +5V and +3.3V outputs are converted from the +12V output. The conversion functionality is mainly realized by the XSEMI XP3R303GMT-L on the DC-to-DC daughterboard. Its rated continuous drain current is 25A at 10V, 70c. It has an RDS(on) value of 3.3 mΩ maximum at 10V, 25c.
Meanwhile, there is a Infsitronix IN1T703I-SDG supervisor IC to realize over/under current and over/under voltage protection. More information about the parts mentioned in this review can be found from their respective datasheets from the manufacturer's website.
The modular cable sockets are soldered onto another daughterboard at the rear of the power supply unit. Having good soldering quality of those sockets is very important, since a significant amount of force will be applied on them when plugging or unplugging the connectors. The sockets in the FSP Vita GM 1000W have very good soldering quality, and I am sure that they can handle some abuse with no problem. In the above photo, you can see a smaller board behind the sockets' daughterboard.
In terms of cooling performance, there are two things we need to pay attention to for a power supply unit; namely the heatsink and cooling fan. In this case, we can see a few aforementioned heatsinks and one cooling fan inside of the FSP Vita GM 1000W. The size of the fan is 120mm in diameter. A smaller fan is used to keep the enclosure small. According to the label on the fan, the D12SH-12 from the Yate Loon uses rifle bearings to keep noise and durability in check. From the product's website, we can see the fan can provide up to 88CFM airflow and rated noise level of 40dB at the maximum speed of 2200 RPM.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
