A Look Inside
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Starting as usual at the input filtering, the Asroc uses three X capacitors, two common-mode chokes, three Y capacitors (including the one after the rectifier) and two MOVs, which is more than enough components. The bridge rectifier used is an 8A, which is more than enough for a 520-watter. The switching transistors are 2SC3320s in the rather dated half-bridge configuration. This explains the average efficiency, since half-bridge is an inefficient design compared to modern two-transistor forward designs. They are obviously just enough to allow the unit to deliver 520W. The voltage doubler section uses two 820µF capacitors from Teapo. The PWM controller is located in the secondary side. It’s a System General SG6105, a very common controller for half-bridge power supplies.
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Teapo capacitors are used throughout the secondary side. As I always say, they aren’t the best, but they aren’t the worst. The fact that there is only one in charge of filtering the 12V rail would explain why the ripple was a bit on the high side. The soldering isn’t particularly untidy, but I don’t like the way the capacitors are soldered. Two of them are soldered rather high off the PCB, with no insulation on the legs. I can understand 1 or 2mm to allow them to lean slightly if the wires push them, but there is no reason to have them sitting 1cm off. It probably won’t cause any major problems, but this is the kind of thing I would expect to see from someone with little or no experience soldering.
The rectifiers on the secondary side are all made by ST Microelectronics. The 12V rail uses two STPS30H100CT Schottky rectifiers rated at 30A each, so the 12V rail is capable of up to 60A in theory. The 5V and 3.3V rails each use a single STPS3045CW rectifier rated at 30A. This means that they are capable of up to 30A in theory. The SG6105 that controls the primary side also monitors the secondary side. It supports Over Voltage (OVP), Under Voltage (UVP), Over Power (OPP) and Short Circuit (SCP) protections. It doesn’t, however, support Over Current Protection, which is required for multi-rail designs, so the Asroc really only has a single 12V rail.
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The fan is a 135mm sleeve bearing part from Young Lin Tech. At full speed, it runs at 1700RPM, pushing 91CFM of air at 36dB. It was only quiet during test 1. It was audible during test 2, and was maxed out by test 4. The noise wasn’t what I would consider disturbing, but it’s certainly not suited to a media-center PC. The heat sinks are fairly large and have a good amount of surface area, although they are clearly not good enough to keep the fan from running fast. The real manufacturer of this unit is not immediately obvious, however, I’m fairly certain that this unit is made by Andyson.
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