Reviews - Antec Earthwatts 750W
Sample Provided by: Antec (By OklahomaWolf on Sun, Aug-23-2009)

Page 4 -

Here's our fan, a more or less common Adda model.

Yep, that's a Delta all right.

Transient filter starts at the AC receptacle, as usual. Two Y capacitors. That's pathetic, you say? Well check this out:

That's the rest of the transient filter, mounted to the PCB that goes in front of the fan. Four Y capacitors, a MOV, two coils, and four X capacitors means overkill.

The soldering is done in usual Delta fashion. With a serious case of obsessive-compulsiveness, that is. Adrian Monk would weep with joy on sight of this.

At first, there only looks to be one bridge rectifier, but there's another one hiding right behind that one you see in the bottom left corner. They're both D25XB60's. That little black box behind the green disk thing is what you think it is - a relay used to help control inrush current.

We have three secondary filter coils for each of the three main rails - that's nothing unique for an indy regulated design.

Primary capacitors are three Samxon models in parallel.

Secondary caps are mostly Nippon Chemi-Con, through there's a Rubycon, a Taicon, and an L-Tec or two in there as well.

The PWM control card. The PWM controller itself is a UC3845B, with an Infineon ICEPCS502 handling the PFC side of it.

The primary heatsink. We have two 24N60C3's and a diode for PFC, and two 6R165P's in double forward for main switchers.

Hmm... that's odd, it almost looks like there are two sets of parts for the 12V rails. Let me just look at the PCB again... aha! That's exactly what's going on, at least in part, with the differing ripple results! The two main 12V rails, serviced by separate parts, share one filter coil. So, for want of a better term, this is an independent/group regulated design. The group part refers to the two 12V rails, which share that coil and are regulated together, and the indy part refers to the separate circuitry for the 5V and 3.3V rails. It's a little bit of an odd way to do things, but I guess it works well enough.

What parts are used? Well, 12V3 and 12V4 get those small parts on the left. Those are STPS41H100CT parts - both of them. Next to those are two larger parts for 12V1 and 12V2 - those are STPS40H100CW parts. Then we have the 3.3V and 5V parts, which both use two STPS30L45CW's.



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