Disassembly
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The Corsair VS450’s input filtering starts with an X-Capacitor and two Y-Capacitors at the AC Receptacle. The main PCB adds 2.5 coils (one only goes over neutral, not active/line), an X-Cap, two Y-Caps and an MOV. In total, there are two X-Caps, 2.5 coils, two Y-Caps and an MOV – easily enough components for the job. The bridge rectifier used is rated at 4A. Considering that this power supply is only rated for a 200-240V input voltage, this is easily good enough. The PFC Capacitor is a 180µF Part supplied by Aishi. Unfortunately, I couldn’t identify the manufacturer of either the switching transistors or the PFC transistor, not could I find a datasheet. The part numbers are respectively GPT10N50G, and GTP13N50DG, which suggests that they are rated at 10A and 13A respectively, but with no datasheet available, I can’t confirm. The PWM controller is located on the solder side of the PCB. It’s a Champion Micro CM6805BG.
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Some of the secondary side capacitors are made by Aishi, but most are from CapXon – a brand renowned for poor quality capacitors. Even in an entry level product, it surprises me that Corsair would be brave enough to use them, as I have had to fix plenty of devices with failed CapXon capacitors which weren’t very old. Even Teapo and OST capacitors are generally considered to be more reliable than CapXon.
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The 12V output uses two PFC Devices PFR30L60CT rectifiers, which are rated at 30A each. These two parts are more than good enough for the 34A claimed by the label. The 5V output uses a PFR30L45CT rectifier, also rated at 30A, and the 3.3V rail uses an ON Semiconductors MBRF2545CT rectifier, rated at 25A. All of these parts are more than good enough for the labelled ratings on the rails they drive. A Sitronix ST9S429 is used as the monitoring IC. I couldn’t find a datasheet for this IC, but some sources suggest it could be a re-badged Unisonic S3515 IC. If this is correct, the IC supports Over Current Protection (OCP) on up to two 12V rails, but Corsair opted not to take advantage of this and just use a single rail.
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The soldering is very tidy. Other than one or two component legs which could have been cut somewhat shorter, there’s not much wrong with it at all. This is much better than I’m used to seeing from CWT-made power supplies.
The fan is supplied by Yate Loon. It was quiet at low loads but became quite noticeable with the PSU under full load. The heatsinks are fairly small, but on a smaller capacity unit, there’s not a lot of heat to dissipate, so they don’t need to be particularly large.
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