A Look Inside & Component AnalysisBefore reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!
The G2-750 uses the exact same platform as the Super Flower Leadex Gold 750 W we reviewed a while ago. The design is modern. The primary side uses a half-bridge topology with an LLC resonant converter, and the secondary side uses a synchronous design and two DC-DC converters for the generation of the minor rails.
The small PCB behind the AC receptacle doesn't host any components of the transient filter as all of them, two CM chokes, two X caps, two pairs of Y caps, and an MOV, are on the main PCB.
A single bridge rectifier is used.
Two Infineon IPP50R199CP fets and a C3D06060A boost diode are used by the APFC converter. The two parallel hold-up caps are right in front of the transient filter and are provided by Nippon Chemi-Con (400 V, 330 µF, 105°C, KMR series).
An NTC thermistor protects the unit against large inrush currents and a close-by electromagnetic relay isolates it from the circuit once it finishes its job.
A small, sealed PCB houses the APFC controller, an NCP1653A IC. It is the same for all Leadex models.
The standby PWM controller is a Fairchild BD5AG IC.
This proprietary IC with markings AA9013 is probably the LLC resonant controller.
Two Infineon IPP50R199CP fets are used as main switches.
The secondary side has two vertical heatsinks that host four fets in total (4x IPP041N04N). In-between these heatsinks are several electrolytic caps by Chemi-Con. These are used for ripple-filtering purposes.
Two DC-DC converters generate the minor rails. The polymer caps found on these converters are provided by Chemi-Con.
The 5VSB rail is rectified by a Mospec S10C60C SBR (Schottky Barrier Rectifier), and the fan-control board with an LM324ADC is installed right next to it.
On the front of the modular PCB are many electrolytic and polymer caps. All provided by Chemi-Con, these offer some extra ripple filtering to the rails. The Leadex Gold unit uses CapXon polymer caps here instead, so the G2-750 clearly takes the lead in this area, although these caps are never put under a significant amount of stress. That said, it is still nice to see EVGA use Japanese caps everywhere while offering the G2-750 W up at an incredibly competitive price.
Soldering quality is good and will allow the unit to deploy its full potential.
The fan is provided by Globe Fan, and its model number is RL4Z B1402512HH (140 mm, 12 V, 0.5 A). EVGA decided to use a cheaper fan to offer the G2-750 at a better price than the SF Leadex Gold 750 W. We strongly believe that most of you will agree with their decision on this matter.