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!





The large fins on the massive primary heatsink easily reveal this unit's manufacturer, Enhance Electronics. The latter is a pretty good OEM, although the company cannot compete with the likes of Delta or Flextronics in the high-end category. However, their implementations are very good for this market segment, and if we judge the company by the V550S we have already tested, they definitely have the ability to offer very high price/performance platforms.


A full bridge topology and an LLC resonant converter are used in the primary side, and the secondary side uses several mosfets to regulate the +12V rail. Two DC-DC converters generate the minor rails, which makes this a pretty modern platform. We were surprised to see a full-bridge topology as such expensive topologies are usually only found in comparatively more expensive high-end PSUs.


The first part of the transient filter consists of two X and a pair of Y caps. The second part is on the main PCB and includes two CM chokes, two X, two Y caps, and an MOV. There is also a thermistor that protects the unit from large inrush currents, along with the corresponding relay.


The single bridge rectifier, a LiteOn GBU1006, has been bolted to the primary heatsink, and we think that its capacity is on the verge for this unit, especially at lower VAC inputs of around 100 V. A stronger rectifier should be used to make sure it doesn't cause any problems under even extreme circumstances.


In the APFC converter, two Infineon IPP50R190CE and a CREE C3D08060A boost diode shape the current sinusoidal to make it match the input voltage. The bulk cap is provided by Panasonic (560uF, 450V, 105°C).


The PFC controller, a Champion CM6502TX, and a CM03X Green PFC controller are installed on a small PCB.


The VSM750 uses a full bridge topology with four Infineon IPP50R280CE fets. The LLC resonant and PWM (for light loads) controller is the for this category famous Champion CM6901. The latter is installed on the solder side of the main PCB, and right next to it is the supervisor IC, a SITI PS223.


The inductive and capacitive parts of the LLC resonant converter.


In the secondary side, four Infineon IPP029N06N fets are installed on a small heatsink. These regulate the +12V rail. The minor rails are generated by two small DC-DC converters. The heatsink that holds the +12V fets has two thermistors on its fins; one is used by the Over Temperature Protection feature and the other by the fan's speed-control circuit. Each of the two VRMs also has an APW7073 PWM controller and a single CSD86350Q5D fet.


The filtering capacitors are a combination of Nippon Chemi-Con-, Rubycon-, and Suncon electrolytics caps, all rated at 105°C. We also found some polymer caps by Unicon.


Electrolytic caps by Suncon (Sanyo) provide some additional ripple filtering on the modular PCB. We also found a single Unicon polymer cap there.


The PWM controller is an STR-A6069H IC and the 5VSB SBR is a PFR 10V45CT.


While the main PCB's primary side is painted red, the solder side is green. Soldering quality here definitely isn't among Enhance's best implementations. We also found two Silicon Labs Si8233BD isolator interfaces on this side.


Cooler Master used a trustworthy and reliable fan, a Yate Loon fan with model number D12BH-12 (12V, 3000 RPM, 101 CFM, 47 dBA). Its ball-bearing will have it last for quite a long time.