EVGA SuperNOVA G2 850 W Review 4

EVGA SuperNOVA G2 850 W Review

Voltage Regulation, Hold-up Time & Inrush Current »

A Look Inside & Component Analysis

Before 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!

By Super Flower, the platform is the same as in the G2-750. It is based on the fresh Leadex platform which is considered one of the best platforms currently available when it comes to efficiency and performance. In the primary side are a half-bridge topology with an LLC resonant converter for increased efficiency, and the secondary side uses a synchronous design and two DC-DC converters for the generation of the minor rails.

The AC receptacle doesn't host any transient filtering components. The latter are installed on the main PCB and include two CM chokes, two pairs of Y caps, two X caps, and an MOV.

The single bridge rectifier is bolted to the primary heatsink.

Two Infineon IPP50R140CP fets and a C3D08065A 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, 390 µF and 330 µF or 720 µF combined, 105°C, KMR series).

The NTC thermistor that protects the unit against large inrush currents and a close-by electromagnetic relay, which isolates it from the circuit once it finishes its job.

A small sealed PCB houses the APFC controller, an NCP1653A IC.

The standby PWM controller is a Fairchild BD6AG IC.

A proprietary IC with model number AA9013 is the LLC resonant controller.

Two Infineon IPP50R140CP fets are used as main switches.

Two vertical heatsinks in the secondary side host six fets in total (6x IPP041N04N), and in-between these heatsinks are several filtering electrolytic caps by Chemi-Con. All are rated at 105°C and belong to the KZE series.

Two DC-DC converters generate the minor rails. The polymer caps both DC-DC converters use are provided by Chemi-Con.

The 5VSB rail is rectified by a Mospec S10C60C SBR (Schottky Barrier Rectifier), and right next to it is the fan-control board. We spotted an LM324ADC on the latter. As you can see above, we applied glue to the bottom of the fan controller's PCB to ensure it doesn't snap off its base when we remove the fan header.

There are many Chemi-Con electrolytic and polymer caps on the front. These are used to bolster ripple filtering. The Leadex Gold unit uses CapXon polymer caps here instead, so the G2 units clearly take the lead here, although the caps will never be put under a significant amount of stress, and polymer caps are generally very reliable regardless of their origin.

Overall soldering quality is good. Super Flower took significant steps in the right direction with their new Leadex platforms.

The fan is provided by Globe Fan, and its model number is RL4Z B1402512HH (140 mm, 12 V, 0.5 A). Super Flower and EVGA decided to use the same fan as in the G2-750 because there is no need for a stronger unit in a PSU with 100 W more capacity.
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