Disassembly
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The input filtering starts at the AC receptacle, with two Y-Capacitors soldered there. The main PCB adds two X-Capacitors, two coils, two Y-Capacitors, and an MOV. In total, there are two X-Capacitors, two coils, four Y-Capacitors, and one MOV, which is easily enough components. Two bridge rectifiers are used – both of which are rated at 6A. The PFC section uses two Infineon IPW60R190C6 MOSFETs rated at 20.2A at 25°C, and 12.8A at 100°C, and a 390µF Capacitor supplied by Panasonic – one of the most reliable capacitor brands. The switching transistors are two Infineon IPW60R125CP MOSFETs which are rated for 25A at 25°C, and 16A at 100°C. The primary side is controlled by a Champion Micro CM6802 PFC/PWM Controller combo.
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The electrolytic capacitors on the secondary side are all supplied by Nippon Chemi-Con – A Japanese brand which are generally quite reliable. There is also one solid capacitor on the main PCB, which is hidden in the wires. I couldn’t identify its manufacturer.
The modular PCB contains more solid capacitors. The ones with pink markings next to the connectors are made by Enesol. I’m not sure who makes the red ones. I’m not overly concerned about their reliability, but what is a concern is that one of the ones to the far left looks like it has been pulled, as much of the leg is showing. The ripple suppression was still very good, considering, though, so I won’t go too hard on it for that. And no, it wasn’t causing the ripple problem on the -12V rail. That’s handled by a few electrolytic capacitors on the main PCB.
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The 12V rail uses transistors for rectification, as opposed to diodes, as this is much more efficient. The parts used are four Infineon IPD031N06L3 MOSFETs rated at 100A each at both 100 and 25°C, so the 12V rail would be capable of up to 400A in theory, if the other components were up to the job. Of course, though, some of this has to be shared with the other rails, as they use DC-DC conversion from the 12V Rail. The transistors used are Infineon parts marked 72T03GH, which the manufacturer doesn’t publish a datasheet for. Two of them are used on the 5V rail, and two on the 3.3V rail.
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The soldering is a little better than I’m used to seeing from CWT, but it’s not without issues. I did spot one questionable looking joint on a resistor on the primary side. It’s worth mentioning that this unit is actually the one with the slightly better soldering of the two.
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The fan is a ball bearing part made by Hong Shen, a brand I’m not very familiar with. It was very quiet throughout the testing, and was only audible with the power supply turbo-charged. The heat sinks have no fins, and thus very little surface to air contact. However, the unit didn’t get very hot. I opened it just a few minutes the overload test and they only felt slightly warm. On most power supplies, the heat sinks would be too hot to touch that soon after the testing. When we’re dealing with over 90% efficiency, there’s just not that much heat to dissipate.
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