A Look Inside & Component Analysis

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


The Integra R2 units are not made by Fractal's favorite OEM ATNG, but by HEC, and this PSU is, in fact, a rebranded HEC-750TB. The platform utilizes a conventional design since their main objective was to keep the production cost as low as possible. A double-forward topology is used on the primary side, and the secondary side uses passive rectification with Schottky diodes instead of mosfets. The main disadvantage of Schottky diodes is their higher voltage drop as compared to fets, and these diodes lead to increased energy dissipation and reduced efficiency.


The transient filter starts right at the AC receptacle with one X and two Y caps. It continues on the main PCB with one DM and two CM chokes, two Y caps, one X and an MOV. All in all, the transient filtering stage is complete.


The single bridge rectifier is a GBJ 1506 that can handle up to 15 A of current, so it easily meets the requirements of this unit.


In the APFC, three Infineon IPP60R190C6s chop the fully rectified signal coming from the bridge rectifier into short pulses, and a BYC10-600 plays the role of the boost diode. The hold-up cap is provided by Teapo (400V, 470μF) and is rated at 105°C.


Two IPP60R190E6 fets configured in a double-forward topology are used as main switchers.


The combo PFC/PWM controller is a FAN4800 IC. It is soldered onto a small vertical daughter-board.


Passive rectification is utilized on the secondary side, and four PFR40L60CT SBRs handle the +12V rail, while the minor rails rectify two pairs of 30A40CT SBRs. The use of Schottky Barrier Rectifier (SBRs) diodes has a negative effect on efficiency as compared to mosfets, but using them shaves some money off the unit's production cost. Finally, the presence of only two toroidal chokes on the secondary side means that a group-regulation scheme is utilized, and the large choke is most likely used by the +12V and 5V rails, while the smaller one is used by the 3.3V rail.


All filtering caps in the secondary side are provided by Teapo and are labeled at 105°C.


The supervisor IC is a SITI PS223 that supports OCP for up to two +12V rails, which covers the unit's specification.


The standby PWM controller is a TNY279PN IC which also, under others, incorporates a 700 V power MOSFET.


Soldering quality on the main PCB is quite good and its overall design is very clean. We were left very satisfied by HEC in this area.


The fan that cools down the unit is provided by Hong Sheng and its model number is A1225M12S (120 mm, 12V, 1900 RPM ±10%, 54 CFM, 30,000 hours of life expectancy). They unfortunately, in an effort to restrict costs, chose a sleeve-bearing fan instead of a ball-bearings fan, which reduces its longevity. Also, this specific fan is quite noisy at high speeds.