Reviews - Corsair AX850
Sample Provided by: Corsair (By jonny on Thu, Aug-26-2010)

Page 4 -

19 screws hold this power supply together... NINETEEN SCREWS! Sure, four hold the modular PCB to the housing, but NINETEEN SCREWS!

Once disassembled, we can see that the Corsair AX850 is based off the Seasonic X-Series power supply.

The first thing you'll probably notice here is that the unit almost completely lacks wires. This is because +12V only connectors, like PCIe, ATX12V, and even the +12V wires that go to the 24-pin power connector, are all fed directly to the modular connectors soldered onto the PCB. Then there are only a handful of +12V wires going to a PCB that has the DC to DC converters as well as modular connectors for peripheral, SATA and the remaining 24-pin power wires on it.

First, our line power goes through a Delta EMI Filter...

After this stage, we go to a typical, albeit stout, transient filter stage.....

In the middle of the above picture, we see our X capacitor, in the lower left we have our two Y capacitors, and located just above the ferrite coil to the right, we have an MOV. There is also a relay in the area of the power supply.

The way this relay is utilized is pretty clever. A thermistor is used in series with the AC input. This thermistor is used to measure and protect against inrush current. Once the PSU is already up and running, the relay is energized and the path to the thermistor is cut off. This increases efficiency by not including the thermistor in the primary circuit.

After this stage, we get to our rectifying stage. To the far left of this same photo, we see two GBJ1506 rectifying bridges screwed to a heatsink.

Three Infineon 6R160C6 power MOSFET's are used on the APFC circuit. The diode is an STPSC806D. The switching transistors used as the main converter is located on the reverse side of this heatsink and are two more of the 6R160C6 MOSFET's

Filtering is done by a pair of Chemi-Con 420V 390uF capacitors rated for up to 105°C operation. Located on a small PCB just next to these capacitors is an IC for controlling the APFC circuit, which is an On Semi NCP16543.

This power supply uses a Champion Micro CM6901 resonant mode controller. Using an LLC resonant topology improves efficiency by changing the switching frequency in response to changing loads.

Speaking of resonant mode controllers.... because the +5VSB is essentially a separate power supply within the power supply, it needs it's own controller. Here, Seasonic uses an Infineon ICE2QR4765 controller.

Now moving to the secondary side of this power supply, things start to really get fun!

Typically, one would use diodes to rectify voltages, and these diodes would be mounted to the secondary heatsink. But this unit uses a set of four Infineon 031N06L MOSFET's.

Add to this that they are mounted to the bottom of the PCB!

Add to this that the heat from the MOSFET's package is dissipated by the power supply housing!

Add to this that shining a light through a prism onto this power supply reveals the image of a unicorn. Ok... maybe not.

The filtering of the +12V is handled by a number of capacitors, mostly solid state capacitors, located in the very middle of the board.

At the top of the above photo, you can see where the row of +12V only powered modular connectors are soldered directly to the board. This completely eliminates any DC wires inside the unit, outside of those delivering +12V power to the DC to DC converters.

For +5V and +3.3V output, Seasonic uses DC to DC converters mounted to the modular PCB.

This part of the power supply uses an APW7159 IC while four Infineon 060N03L power MOSFET's regulate the +5V output and four more of the same power MOSFET's regulate the +3.3V.

The filtering stage for the +3.3V and +5V are on the other side of the modular PCB...

The supervisor IC used on this unit is the Silicon Touch PS223. It's responsible for OCP, OVP and UVP.

Finally, the fan that keeps all of these components cool is a Sanyo Denki San Ace 120 double ball bearing fan.

In the above picture, you can see a primitive baffle is used to force the air towards the front of the PSU so it doesn't all immediately escape out the back. It's not as fancy as some baffles I've seen, but I'm sure it gets the job done.

Well... That was a hell of a break down. Let's go ahead and score this thing now....

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