LEPA went with a honeycomb mesh rather than the standard circular guard for the 135mm cooling fan of its unit. The simple looking, black fan is supplied by ADDA, a known manufacturer. The ADN512UB-A90 has a ball bearing for long-term reliability and a maximum rotational speed of 2500RPM. Hopefully, it will not have to rotate as fast while cooling the LEPA G1600 power supply; otherwise the result would simply be ear-bursting.
As we mentioned before, LEPA is the in-house brand of Enermax and, since Enermax designs and produces their own units, the G1600 is based on an Enermax design. As a matter of fact, the G1600 appears to simply be a slightly modified version of the same platform Enermax has been using for their own MaxRevo series, which we reviewed over a year ago.
The filtering stage starts on the A/C receptacle, which itself is a standard line filter but with two extra Y-type capacitors attached to it. Of course LEPA enhanced it further with more components on the main PCB, therefore the components forming the filtering stage are six Y-type capacitors, two X-type capacitors, five filtering coils and a surge suppressing MOV. A standard glass fuse can also be found on the main PCB.
Three Matsushita (Panasonic) 330μF/400V capacitors and a filtering coil of average size form the passive components of the APFC stage, with the APFC transistors installed on the large heatsink along the side of the main PCB. The primary side transistors are attached on the smaller heatsink which is placed in parallel to the main capacitors, forming an L/C resonant conversion full bridge topology.
The secondary stage rectifier transistors can be found attached on a heatsink identical to that of the primary stage but on the other side of the high density transformer. Filtering coils and a large number of capacitors from Rubycon aid with the filtering of the secondary stage's 12V output. Other, secondary capacitors are being provided by Nippon Chemi-Con (electrolytics) and Enesol (solid state), making the LEPA G1600 an all-Japanese affair.
DC to DC conversions and extra filtering takes place on the vertical PCB which holds the modular cable connectors. No cables are being used to transfer power between the main and the vertical PCB; all of the unit's output is being transferred via thick bus bars, a necessity for a power supply of this class and power output.