Fractal Design Integra R2 750 W Power Supply Review
By Gabriel Torres on December 10, 2012


Introduction

Hardware Secrets Golden Award

The Fractal Design Integra R2 is available in 500 W, 650 W, and 750 W versions, all with the 80 Plus Bronze certification. Let’s take a look at the 750 W model, which comes with a very nice price tag.

This power supply is manufactured by HEC, being a rebranded HEC-750TB. This is the same platform used by the Cougar CMX V2 700 W. The only difference between the two are the +12 V rectifiers, which are “stronger” on the Fractal Design Integra R2 750 W and the use, on the Cougar CMX V2 700 W, of a Japanese capacitor on the primary and a modular cabling system.

Fractal Design Integra R2 750w
click to enlarge
Figure 1: Fractal Design Integra R2 750 W power supply

Fractal Design Integra R2 750w
click to enlarge
Figure 2: Fractal Design Integra R2 750 W power supply

The Fractal Design Integra R2 750 W is 5.5” (140 mm) deep, using a 120 mm sleeve bearing fan on its bottom (Hong Sheng A1335M12S).

Fractal Design Integra R2 750w
click to enlarge
Figure 3: Fan

This unit doesn’t have a modular cabling system. All cables use nylon sleeves that come from inside the unit. This power supply comes with the following cables:

All wires are 18 AWG, which is the correct gauge to be used.

The cable configuration is compatible with a mainstream 750 W unit.

Fractal Design Integra R2 750w
click to enlarge
Figure 4: Cables

Let’s now take an in-depth look inside this power supply.

A Look Inside the Fractal Design Integra R2 750 W

We decided to disassemble this power supply to see what it looks like inside, how it is designed, and what components are used. Please read our “Anatomy of Switching Power Supplies” tutorial to understand how a power supply works and to compare this power supply to others. 

On this page we will have an overall look, while in the following pages we will discuss in detail the quality and ratings of the components used.

Fractal Design Integra R2 750w
click to enlarge
Figure 5: Top view

Fractal Design Integra R2 750w
click to enlarge
Figure 6: Front quarter view

Fractal Design Integra R2 750w
click to enlarge
Figure 7: Rear quarter view

Fractal Design Integra R2 750w
click to enlarge
Figure 8: The printed circuit board

Transient Filtering Stage

As we have mentioned in other articles and reviews, the first place we look when opening a power supply for a hint about its quality, is its filtering stage. The recommended components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor), and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components, usually removing the MOV and the first coil. 

In this power supply, this stage is flawless. It has one X capacitor, two Y capacitors, and one ferrite coil more than the minimum required.

Fractal Design Integra R2 750w
click to enlarge
Figure 9: Transient filtering stage (part 1)

Fractal Design Integra R2 750w
click to enlarge
Figure 10: Transient filtering stage (part 2)

On the next page, we will have a more detailed discussion about the components used in the Fractal Design Integra R2 750 W.

Primary Analysis

On this page, we will take an in-depth look at the primary stage of the Fractal Design Integra R2 750 W. For a better understanding, please read our “Anatomy of Switching Power Supplies” tutorial.

This power supply uses one GBJ1506 rectifying bridge, attached to the same heatsink as the active PFC transistors. This component supports up to 15 A at 100° C, so in theory, you would be able to pull up to 1,725 W from a 115 V power grid. Assuming 80% efficiency, the bridge would allow this unit to deliver up to 1,380 W without burning itself out. Of course, we are only talking about this particular component. The real limit will depend on all the components combined in this power supply.   

Fractal Design Integra R2 750w
click to enlarge
Figure 11: Rectifying bridge

The active PFC circuit uses three IPP60R190C6 MOSFETs, each supporting up to 20.2 A at 25° C or 12.8 A at 100° C in continuous mode (note the difference temperature makes), or 59 A in pulse mode at 25° C. These transistors present a 190 mΩ resistance when turned on, a characteristic called RDS(on). The lower the number the better, meaning that the transistor will waste less power, and the power supply will have a higher efficiency.

Fractal Design Integra R2 750w
click to enlarge
Figure 12: Active PFC transistors and diode

The output of the active PFC circuit is filtered by one 470 µF x 400 V electrolytic capacitor, from Teapo, labeled at 105° C.

Fractal Design Integra R2 750w
click to enlarge
Figure 13: Capacitor

In the switching section, two IPP60R190E6 MOSFETs are used in the traditional two-transistor forward configuration. The specifications for these transistors are the same as for the active PFC transistors.   

Fractal Design Integra R2 750w
click to enlarge
Figure 14: One of the switching transistors

The primary is controlled by an FAN4800 active PFC/PWM combo controller.  

Fractal Design Integra R2 750w
click to enlarge
Figure 15: Active PFC/PWM combo controller

Let’s now take a look at the secondary of this power supply.

Secondary Analysis

The Fractal Design Integra R2 750 W has eight Schottky rectifiers attached to the secondary heatsink.

The maximum theoretical current each line can deliver is given by the formula I / (1 - D) where D is the duty cycle used and I is the maximum current supported by the rectifying diode. As an exercise, we can assume a duty cycle of 30 percent.

The +12 V output uses four PFR40L60CT Schottky rectifiers (40 A, 20 A per internal diode at 110° C, 0.65 V maximum voltage drop), giving us a maximum theoretical current of 114 A or 1,371 W for this output. 

The +5 V output uses two SBR30A40CT Schottky rectifiers (30 A, 15 A per internal diode at 110° C, 0.50 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for this output.   

The +3.3 V output uses another two SBR30A40CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for this output.

Fractal Design Integra R2 750w
click to enlarge
Figure 16: The +3.3 V, +5 V, and +12 V rectifiers

This power supply uses a PS223 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), over current (OCP), and over temperature (OTP) protections. This chip has four OCP channels, one for +3.3 V, one for +5 V, and two for +12 V, correctly matching the number of +12 V rails advertised by the power supply manufacturer (two).  

Fractal Design Integra R2 750w
click to enlarge
Figure 17: Monitoring circuit

The electrolytic capacitors available in the secondary are from Teapo, and are labeled at 105° C.

Fractal Design Integra R2 750w
click to enlarge
Figure 18: Capacitors

The +5VSB Power Supply

The +5VSB (a.k.a. standby) power supply is independent of the main power supply, since it is on continuously.

On the Fractal Design Integra R2 750 W, the +5VSB power supply uses a TNY279PN integrated circuit, which incorporates the PWM controller and the switching transistor in a single chip.  

Fractal Design Integra R2 750w
click to enlarge
Figure 19: The +5VSB integrated circuit with an integrated switching transistor

The rectification of the +5VSB output is performed by an SBL1040CT Schottky rectifier, which supports up to 10 A (5 A per internal diode at 95° C, 0.55 V maximum voltage drop).  

Fractal Design Integra R2 750w
click to enlarge
Figure 20: The +5VSB rectifier

Power Distribution

In Figure 21, you can see the power supply label containing all the power specs.

Fractal Design Integra R2 750w
click to enlarge
Figure 21: Power supply label

This power supply is sold as having two +12 V rails, which is correct, since this unit has two +12 V over current protection channels. Click here to understand more about this subject.    

The two +12 V rails are distributed as follows:

When using only one video card, it is important to use the video card power cable that has solid yellow wires. Otherwise, you will have your video card installed on the same rail as your CPU, which may trigger the power supply’s over current protection.

How much power can this unit really deliver? Let’s find out.

Load Tests

We conducted several tests with this power supply, as described in the article, “Hardware Secrets Power Supply Test Methodology.”  

First, we tested this power supply with five different load patterns, trying to pull around 20%, 40%, 60%, 80%, and 100% of its labeled maximum capacity (actual percentage used listed under “% Max Load”), watching the behavior of the reviewed unit under each load. In the table below, we list the load patterns we used and the results for each load.

If you add all the powers listed for each test, you may find a different value than what is posted under “Total” below. Since each output can have a slight variation (e.g., the +5 V output working at 5.10 V), the actual total amount of power being delivered is slightly different than the calculated value. In the “Total” row, we are using the real amount of power being delivered, as measured by our load tester.

The +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test, the +12VA input was connected to the power supply’s +12V1 rail, while the +12VB input was connected to the power supply’s +12V2 rail.

Input

Test 1

Test 2

Test 3

Test 4

Test 5

+12VA

5.5 A (66 W)

11.5 A (138 W)

17 A (204 W)

22.5 A (270 W)

28.5 A (342 W)

+12VB

5.5 A (66 W)

11 A (132 W)

16.5 A (198 W)

22 A (264 W)

28.5 A (342 W)

+5 V

1 A (5 W)

2 A (10 W)

4 A (20 W)

6 A (30 W)

8 A (40 W)

+3.3 V

1 A (3.3 W)

2 A (6.6 W)

4 A (13.2 W)

6 A (19.8 W)

8 A (26.4 W)

+5VSB

1 A (5 W)

1.5 A (7.5 W)

2 A (10 W)

2.5 A (12.5 W)

3 A (15 W)

-12 V

0.5 A (6 W)

0.5 A (6 W)

0.5 A (6 W)

0.5 A (6 W)

0.5 A (6 W)

Total

150.3 W

296.9 W

444.8 W

589.4 W

747.4 W

% Max Load

20.0%

39.6%

59.3%

78.6%

99.7%

Room Temp.

45.5° C

44.8° C

45.8° C

48.2° C

49.4° C

PSU Temp.

50.0° C

49.9° C

50.4° C

52.5° C

56.0° C

Voltage Regulation

Pass

Pass

Pass

Pass

Pass

Ripple and Noise

Pass

Pass

Pass

Pass

Pass

AC Power

175.5 W

342.8 W

519.2 W

703.0 W

923.0 W

Efficiency

85.6%

86.6%

85.7%

83.8%

81.0%

AC Voltage

117.2 V

115.7 V

114.2 V

112.1 V

110.0 V

Power Factor

0.979

0.99

0.994

0.995

0.996

Final Result

Pass

Pass

Pass

Pass

Pass

The Fractal Design Integra R2 750 W passed our tests.

The 80 Plus Bronze certification promises efficiency of at least 82% under light (i.e., 20%) load, 85% under typical (i.e., 50%) load, and 82% under full (i.e., 100%) load. During our tests, the Fractal Design Integra R2 750 W was not able to present 82% efficiency at full load. However, we have to consider that we tested this power supply at almost 50° C, while the 80 Plus certification tests are conducted at 23° C, and efficiency drops as temperature increases. Another explanation for the lower efficiency is because of the AC voltage, which was below 115 V during this particular test. On the other hand, we have excellent efficiency numbers for the other tests, in particular at light load, where we saw 85% efficiency.

Let’s discuss voltage regulation on the next page.

Voltage Regulation Tests

The ATX12V specification states that positive voltages must be within 5% of their nominal values, and negative voltages must be within 10% of their nominal values. We consider a power supply as “flawless” if it shows voltages within 3% of its nominal values. In the table below, you can see the power supply voltages during our tests and, in the following table, the deviation, in percentage, of their nominal values.

The Fractal Design Integra R2 750 W presented very good voltage regulation for a mainstream unit.

Input

Test 1

Test 2

Test 3

Test 4

Test 5

+12VA

+11.94 V

+11.88 V

+11.84 V

+11.75 V

+11.65 V

+12VB

+11.94 V

+11.87 V

+11.81 V

+11.71 V

+11.60 V

+5 V

+5.04 V

+5.02 V

+4.99 V

+4.96 V

+4.93 V

+3.3 V

+3.29 V

+3.27 V

+3.25 V

+3.22 V

+3.19 V

+5VSB

+4.97 V

+4.94 V

+4.91 V

+4.87 V

+4.82 V

-12 V

-11.47 V

-11.57 V

-11.65 V

-11.72 V

-11.81 V


Input

Test 1

Test 2

Test 3

Test 4

Test 5

+12VA

-0.50%

-1.00%

-1.33%

-2.08%

-2.92%

+12VB

-0.50%

-1.08%

-1.58%

-2.42%

-3.33%

+5 V

0.80%

0.40%

-0.20%

-0.80%

-1.40%

+3.3 V

-0.30%

-0.91%

-1.52%

-2.42%

-3.33%

+5VSB

-0.60%

-1.20%

-1.80%

-2.60%

-3.60%

-12 V

4.62%

3.72%

3.00%

2.39%

1.61%

Let’s discuss the ripple and noise levels on the next page.

Ripple and Noise Tests

Voltages at the power supply outputs must be as “clean” as possible, with no noise or oscillation (also known as “ripple”). The maximum ripple and noise levels allowed are 120 mV for +12 V and -12 V outputs, and 50 mV for +5 V, +3.3 V and +5VSB outputs. All values are peak-to-peak figures. We consider a power supply as being top-notch if it can produce half or less of the maximum allowed ripple and noise levels.

The Fractal Design Integra R2 750 W provided low ripple and noise levels, as you can see in the table below.

Input

Test 1

Test 2

Test 3

Test 4

Test 5

+12VA

26.0 mV

27.0 mV

32.8 mV

41.8 mV

60.6 mV

+12VB

22.6 mV

25.4 mV

30.6 mV

36.4 mV

51.8 mV

+5 V

10.2 mV

12.2 mV

14.8 mV

17.6 mV

21.4 mV

+3.3 V

16.8 mV

18.6 mV

21.8 mV

23.4 mV

26.2 mV

+5VSB

26.4 mV

26.2 mV

29.0 mV

32.0 mV

40.4 mV

-12 V

48.4 mV

47.4 mV

50.6 mV

52.8 mV

52.4 mV

Below you can see the waveforms of the outputs during test five.

Fractal Design Integra R2 750w
click to enlarge
Figure 22: +12VA input from load tester during test five at 747.4 W (60.6 mV)

Fractal Design Integra R2 750w
click to enlarge
Figure 23: +12VB input from load tester during test five at 747.4 W (51.8 mV)

Fractal Design Integra R2 750w
click to enlarge
Figure 24: +5V rail during test five at 747.4 W (21.4 mV)

Fractal Design Integra R2 750w
click to enlarge
Figure 25: +3.3 V rail during test five at 747.4 W (26.2 mV)

Let’s see if we can pull more than 750 W from this unit.

Overload Tests

Below you can see the maximum we could pull from this power supply. The objective of this test is to see if the power supply has its protection circuits working properly. The maximum we could pull from this power supply is listed below. During this test, ripple and noise levels were still low, and voltages were still within their allowed range.

Input

Overload Test

+12VA

31 A (372 W)

+12VB

31 A (372 W)

+5 V

18 A (90 W)

+3.3 V

18 A (59.4 W)

+5VSB

3 A (15 W)

-12 V

0.5 A (6 W)

Total

889.4 W

% Max Load

118.6%

Room Temp.

47.4° C

PSU Temp.

52.7° C

AC Power

1,145 W

Efficiency

77.7%

AC Voltage

106.3 V

Power Factor

0.998

Main Specifications

The main specifications for the Fractal Design Integra R2 750 W power supply include:

Conclusions

The Fractal Design Integra R2 750 W proved to be an excellent mainstream power supply, with very good efficiency, voltage regulation, and ripple and noise levels for a product targeted at this segment, at an unbeatable price (USD 80). One of the highlights of this power supply is its depth. It is only 5.5” (140 mm) deep, fitting some small form factor (SFF) cases that require power supplies with this dimension.

Originally at http://www.hardwaresecrets.com/article/Fractal-Design-Integra-R2-750-W-Power-Supply-Review/1688


© 2004-13, Hardware Secrets, LLC. All Rights Reserved.

Total or partial reproduction of the contents of this site, as well as that of the texts available for downloading, be this in the electronic media, in print, or any other form of distribution, is expressly forbidden. Those who do not comply with these copyright laws will be indicted and punished according to the International Copyrights Law.

We do not take responsibility for material damage of any kind caused by the use of information contained in Hardware Secrets.