Component Analysis

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Compared to the original platform in the PG-M units, this one received a few upgrades for tighter protection features and larger heatsinks to keep the FETs cooler. Despite the PCB's small dimensions, the design is nice and clean, allowing for plenty of airflow. Capacitors nowadays are like diamonds, hard to find and very expensive, so MEIC had to use Lelon caps on the secondary side, which have good specifications. If these specifications are not too far removed from real-life, the caps won't be the problem. However, the low-quality fan claiming to have a hydraulic bearing only has a rifle bearing and is the same as in the P-GM 750 W and 850 W units.


The transient filter is complete. There is also an MOV for protection against power surges.


I found a discharge IC in the transient filter; it provides a small efficiency boost.


An NTC thermistor lowers inrush currents. A bypass relay supports it.


The two bridge rectifiers can handle up to 30 A combined.


The APFC converter uses two NCE Power FETs and a single JF boost diode. The bulk cap is by Chemi-Con, so it is of high quality. I would like it to have a 420 V rating, though.


The APFC controller is a Champion CM6500UNX.


The two NCE Power primary switching FETs are installed in a half-bridge topology.


The resonant controller is a Champion CM6901T6X.


The main transformer is next to the parts for the LLC resonant controller.


The FETs regulating the +12 V rail are hidden by the two black heatsinks attached to the silver heatsinks through screws. To remove them, I would have to apply excessive heat to the PCB, close to the +12V FETs, which would probably damage them, so I chose not to. I might need this PSU for more measurements in the future.


The electrolytic caps on the secondary side are by Lelon. There are also eight polymer caps from the same brand.


Two DC-DC converters generate the minor rails.


The standby PWM controller is a PR8109T IC, and the 5VSB secondary rectifier is an SP10U45L SBR.


The supervisor controller is a Weltrend WT7502R.


Four polymer and four electrolytic caps on the modular PCB further reduce ripple.


Soldering quality is great!


This is the same fan as in the lower-capacity PG-M units. It is supposed to have a high-quality hydraulic bearing, but when I broke it down in the P750GM review, I found a plain rifle bearing instead. Still, a rifle bearing is far better than a sleeve one.