OCZ Fatal1ty 550 W Review 0

OCZ Fatal1ty 550 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!

We recently saw this platform in our NZXT HALE82 V2 700 W review, and its performance failed to impress us. It is by Sirtec, a manufacturer of budget-oriented units, not cutting-edge and expensive ones. Su'scon caps, which are of mediocre quality, are then used everywhere, and the design is outdated as passive components rectify the rails in the secondary side and a group regulated scheme is utilized. We are pretty sure performance in crossload tests will suck big time.

The transient filter usually starts at the AC receptacle with one X and two Y caps. We spotted a CMD02X on the X cap. It restricts energy losses on the bleeding resistor. The second part of the transient filter is on the main PCB and includes two CM chokes, one X cap, two Y caps, and an MOV that has been installed behind the bridge rectifier. We really don't understand why the MOV has been instaled after the bridge rectifier since it leaves the latter exposed to power surges.

The single bridge rectifier is bolted to a small, dedicated heatsink. The small MOV is installed right in front of it.

In the APFC converter, two AP20S60I fets and a single BYC10-600 boost diode are used. The bulk cap is provided by Su'scon (330 μF, 400 V, 85C, LX series) and is not only of incredibly low quality, but also low capacity. The prerogative was obviously to save a couple bucks by using the most affordable cap around.

Two Magnachip MDP18N50 fets are used as main switchers. The same heatsink that holds the above fets also hosts the SBR that rectifies the 5VSB rail, a UTC 2N60L.

Budget restrictions dictate the use of a group regulated scheme in the secondary side, where the 12V and 5V rails use the same voltage regulating circuit and the same toroidal choke, while the 3.3V rail uses the smaller toroidal choke and is generated by a magamp post regulator. Only having two chokes in the secondary side is usually a clear indication of a group regulated design, and the main disadvantage of the latter as compared to independent regulation on all rails is the mediocre performance with highly unbalanced loads on all rails.

Four PFR30L60CT SBRs (Schottky Barrier Diodes) rectify the +12V rail, while the minor rails are generated by two Mospec S30D45C SBRs. All filtering caps in the secondary side are also provided by Su'scon. We would definitely like better caps here.

Two small Su'scon caps on the front of the modular PCB provide some extra ripple filtering, and soldering quality on the obverse side isn't so good.

The protections IC, a Sitronix ST95313, is soldered directly to the main PCB, and we didn't find any information about it on the net. Taking into account its small size and the unit's specifications, it must only provide the very basic protection features.

Soldering quality on the rear side of the main PCB is of acceptable quality.

We found a CM6803 IC, the combo PFC/Standby controller, and a CM03X Green PFC controller on the solder side of the PCB.

The fan is provided by Globefan, and its model number is RL4Z S1352512H (12 V, 0.33 A, 106.86 CFM, 29.2 dBA, 1500 RPM). It uses a plain sleeve bearing and belongs to the budget/mainstream category, like the PSU it equips.
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