A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.


The OEM of all HCP series PSUs is the famous Delta Electronics, one of the largest manufacturers regarding various electronic components. With a quick look at the interior we noticed that the secondary heatsink is missing and the primary one is quite small. In general the main PCB is lightly populated. In order to achieve Gold efficiency the unit utilizes an LLC converter along with a full bridge topology.


The transient filtering stage starts at the AC receptacle with two Y capacitors. Afterwards a horizontal small PCB houses two coils, two X and four Y caps and an MOV. However the transient filter doesn't end there but it continues on the main PCB with one coil and two Y caps. On the main PCB there is also a thermistor for inrush current protection along with the relay that bypasses it once the PSU starts.


The two bridge rectifiers, D25XB60, are bolted to a heatsink. They are very strong for the PSU's capacity.


The APFC controller, a FAN6982, is located on a vertical daughter board next to the three PFC Rubycon caps (180 μF, 450 V, 105°C). The APFC mosfets are two IPP60R125CP. As primary switches we find four SPA20N60CFD mosfets, so the PSU utilizes a full bridge topology.


The standby PWM controller is a TNY280PN IC and is located on the main PCB right between the primary transformer and the APFC choke.


In the secondary side synchronous design is used of course and the four IPD031N06L3 G mosfets are located on the solder side of the main PCB and are cooled passively by the case. The same technique that Seasonic uses in their X-series PSUs. Near to the +12V mosfets resides the LLC resonant controller, a Champion CM6901. A mix of Nippon Chemi-Con polymer capacitors and Rubycon electrolytic ones is used for ripple filtering in the secondary. It's very hard to find a better combination than this, that's for sure. The minor rails are generated through two DC-DC converters that are housed on the same PCB. The PWM controller for the two VRMs is the classic APW7159. Unfortunately we couldn't read the model numbers of the mosfets there.


The protections circuit is housed on a vertical daughter-board near the edge of the main PCB. It gives shelter to a Weltrend DWA103N.


On the modular PCB we noticed something that other reviewers also highlighted on the HCP-850 that uses the same layout. The standoffs that keep the modular PCB in place are not bolted with nuts but simply soldered, so if you try to take the screws out you may break the solder and then the standoffs will spin like crazy! Thankfully we managed to remove all screws from the modular PCB without breaking any joints but someone else may not be so lucky. On the other hand a typical user will never take apart the PSU as we reviewers do so he won't even notice this manufacturing flaw.


On the front side of the modular PCB we found one more Rubycon electrolytic cap.


Soldering quality on the main&modular PCBs is typical Delta, superb.


The unit's cooling fan is provided by ADDA and its model number is ADN512UB-A9B (12V, 0.44A).