A Look Inside
_
As usual, I’ll start at the input filter. It consists of two X-Capacitors, two coils and four Y-Capacitors, although there is no MOV to filter out spikes and surges, so make sure you use a surge protector with it. The bridge rectifier is a 15A part, which is more than good enough for a 750W. Assuming 82% efficiency (which is required for 80+ Bronze) it will allow the unit to deliver up to 1414.5W in theory from a 115V input voltage. The primary side is controlled by a Champion Micro CM6800, which drives two Infineon SPW24N60C3 CoolMos PFC Transistors rated at 24A each and two Infineon IPP60R199CP Switching transistors rated at 16A at 25°C and 10A at 100°C. It was clearly more than enough to allow this unit to deliver the labelled 750W. The primary capacitors are a pair of 270µF parts from Rubycon, which is probably the most reliable brand of capacitor on the world.
_
Moving on to the secondary side, we can see that, like the label says, the unit really does have four 12v rails, in the configuration which I assumed based on the colour-coding of the wires. There are four separate groups of wires, each with its own OCP shunt resistor. Two of them are covered with glue but I can see where they’re soldered on the underside of the PCB. As one would expect from a high end product from a company like Delta, the soldering is tidy with all component legs cut to appropriate lengths.
_
For the rectification, the 12v rail uses two Infineon IPP037N08N3 Transistors rated at 100A each for the direct rectification and three STPS61L60CT Schottky rectifiers rated at 60A for the freewheeling. The 5V rail uses two STPS30L40CT Schottky rectifiers in parallel, which gives us a combined total of 60A for the 5v Rail. On the 3.3v rail, the unit uses two MBR30H30CTG schottky rectifiers in parallel, which will allow it to deliver 60A, like the 5v rail. All of the rails have more than enough capacity for their labelled ratings, which is why I was able to pull close to 1kW without damaging anything. All but two of the capacitors on the secondary are Nippon Chemi-Con. One of the other two is a Nichicon and the other is a Rubycon. All three of these manufacturers are Japanese, which is what I like to see.
_
If you don’t like snakes, this is not the power supply for you, but at least this Death Adder, um… Adda is a ball-bearing, which are typically a lot more reliable than their sleeve-bearing counterparts. It remained very quiet until I asked for 100% load, where it became audible, although that’s to be expected. I must confess that for a 750 Watter, the heat sinks do look a bit on the small side, but since this is a more efficient unit, they don’t need to be big. I think that just about wraps it up, let’s put it back together and score it.
Loading ...