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 better.


The OEM of this unit is Seasonic, one of the major PSU OEMs with a very active R&D department, good platforms and high quality products. The P10-PRO-1000 is, most likely, based on the Seasonic X-1050 platform, with, of course, several changes that were made under Be Quiet's supervision/demand. A full bridge topology, along with an LLC resonant converter in an effort to boost efficiency, is used with the primary side, while inside the secondary side, we find synchronous rectification, along with two VRMs, for the generation of the minor rails. Both VRMs reside on the modular PCB in order to minimize voltage drops. Like the rest of Dark Power Pro units, opening this one wasn't an easy task since we had to remove 22 screws in total before we removed the main PCB out of the casing!


The AC receptacle includes a server-grade line filter from Yunpen (Y015T1). It consists of one X, two Y caps and a CM choke. As usual, the transient filtering stage continues on the main PCB with one X and four Y caps, two CM chokes and an MOV. There is also a thermistor, providing protection against large inrush currents and the corresponding relay that bypasses it, once it finishes its job.


The two parallel rectifying bridges are bolted on a dedicated heatsink. Their model number is GBJ 2506 and each one can handle up to 25 A of current.


In the APFC two Infineon IPW60R165CP fets are used along with an STPSC806D boost diode.


The three parallel hold-up caps are provided by Nippon Chemi-Con (420V, 330µF, 105°C, KMR series). The LLC resonant and PWM controller is a Champion CM6901 and it is located on a vertical PCB behind the middle hold-up cap.


As main choppers four IPP60R190C6 fets are used in a full-bridge topology. A resonant converter is also exploited for higher efficiency by allowing the loss-less switching of the main switchers.


The current transformer used by the OPP (Over Power Protection) circuit of the CM6901 controller.



Inside the secondary side, like in all X and P series Seasonic PSUs, we find several smaller heatsinks with no components bolted to them, except for a small thermistor used by the fan-speed control circuit. The four fets responsible for the rectification of +12V are installed at the solder side of the main PCB and are cooled passively by the unit's case and aforementioned heatsinks. Their model number is BSC027N04LS and they are made by Infineon. A copper plate is installed between the +12V fets to provide increased conductivity.


Polymer Chemi-Con caps, and some electrolytic ones provided by the same company (rated at 105°C KZM series), filter the +12V rail.


The minor rails are, in an effort to minimize voltage drops, generated by two VRMs which are installed on the modular PCB. The common PWM buck controller is an APW7159 and, in each VRM, three fets are used. Finally, all filtering caps on the modular PCB are polymer ones and come from Chemi-Con.


On the front side of the modular PCB we also found a transistor (UTC 2SD1691L), which is used for the temperature control of the external fans, making them electrically independent from the internal fan.


This vertical PCB, located inside the secondary side, houses the protections IC, a SITI PS232F which supports OCP for up to four +12V channels, matching the specifications of this unit. There is also an AS393 dual-voltage comparator on the same PCB.


The off-line PWM controller is soldered on the component side of the main PCB and is an Infineon ICE2QR4765 IC.


Soldering on the main PCB is of high quality, carrying on Seasonic's tradition. We didn't spot any long component leads which would have spoiled our good impression.


Be Quiet equipped the PSU with a high-quality fan that uses Fluid Dynamic Bearing for silent operation and extended lifespan. Its model number is BQT T13525-XF28 (12V, 0.50A, 2800RPM max, 119.08 CFM, 5.97 mmH2O). It is, at normal ambient, totally inaudible, but makes a lot of noise if you manage to push it to its limit.