Disassembly
The input filtering starts at the AC receptacle, with an X capacitor and two Y capacitors soldered to it. The main PCB contains another X cap, two common-mode chokes, two Y caps and an MOV, bringing the total component count to two X caps, four Y caps, two common-mode chokes and one MOV, which is enough components. The PFC section contains an Infineon IPW60R190E6 MOSFET rated at 20.2A at 25°C and 12.8A at 100°C, with an RDS-on of 0.19Ω. The primary capacitor is a 470µF part supplied by Nippon Chemi-con. This section is controlled by an Infineon ICE3PCS01G PFC Controller IC. The switching transistors are ST Micro STP26NM60N MOSFETs rated at 20A at 25°C and 12.6A at 100°C, with an RDS-on of 0.165Ω. They are controlled by an Infineon ICE2HS01G resonant controller.
The secondary side uses a mix of polymer and traditional electrolytic capacitors. The polymer capacitors are all Samxon parts, while the electrolytic capacitors are mostly Japanese, supplied by Nippon Chemi-Con. There are, however, two AiSHi parts – which are a Chinese brand. They should not be used in a semi-fanless unit, as non-Japanese capacitors are much less tolerant of heat, and need more airflow to keep them cool.
The 12V rail uses synchronous rectification, where transistors are used, offering improved efficiency. The transistors used are Infineon IPP015N04N MOSFETs. They are rated at 120A, regardless of the temperature, with an RDS-on of 0.0015Ω. This is plenty of capacity for a rail rated at 42A. The other two rails use DC-DC conversion from the 12V rail. The VRMs use two Infineon IPD036N04L MOSFETs. They are rated for 90A at 25°C and 87A at 100°C, with an RDS-on of 0.0036Ω, and are controlled by an ANPEC APW7073 buck controller IC. The secondary side is controlled by a Weltrend WT751002. It doesn’t support OCP, and there are no shunts on the 12V rails, so this is definitely a single rail design.
There are a lot of hand-done solder joints in this power supply, and some of them are not very tidy. Note, for instance, the soldering on the parts labelled R321 and D302 near the middle of the above-right picture. There is far too much solder used.
The fan is a Yate Loon sleeve bearing part. This model has speed, airflow and noise ratings of 1350RPM, 47CFM, and 28dB. As stated earlier, I could never hear it, even with the load tester’s fans turned off. The heat sinks are small, but I measured their temperature after the power supply shut down. The hottest was the secondary heat sink, but even it was only at 52°C. The transistors can tolerate higher temperatures than that, so the Over Temperature Protection could be safely set for a higher temperature, and there would have been no problems with the power supply shutting down at full load.
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