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[nextpage title=”Introduction”]
The Jumper 300G “Planet3dnow.de Edition” is a modified version of the Huntkey Jumper 300G power supply suggested by this hardware-reviewing German website, and it is the first high-end, low-wattage power supply to arrive on the market. Let’s check it out.
The differences between this “special edition” and the regular Jumper 300G are the use of a better electrolytic capacitor in the primary (Japanese capacitor rated at 105° C instead of a Chinese one rated at 85° C), a different connector configuration, and over current protection (OCP) set at a higher trigger point.
It is very interesting to know that Planet3dnow.de didn’t make any money by helping Huntkey to improve this product. The reasoning behind that, according to Martin Kaffei, Planet3dnow.de’s power supply editor, is that “[they] want to show manufacturers [what] a good power supply should look like. A thousand watts is just not necessary for most computers, while most small-[wattage] power supplies are cheap.”
Figure 1: Huntkey Jumper 300G Planet3dnow.de Edition power supply
Figure 2: Huntkey Jumper 300G Planet3dnow.de Edition power supply
The Huntkey Jumper 300G Planet3dnow.de Edition is 5.5” (140 mm) deep, using a 120 mm ball bearing fan on its bottom (Yateloon D12BL-12).
This unit doesn’t have a modular cabling system, and all cables are protected with nylon sleeves. This power supply comes with the following cables:
- Main motherboard cable with a 20/24-pin connector, 16.9” (43 cm) long
- One cable with two ATX12V connectors that together form an EPS12V connector, 21.2” (54 cm) long
- One cable with one six-pin connector for video cards, 17.7” (45 cm) long
- One cable with three SATA power connectors and one peripheral power connector, 17.3” (44 cm) to the first connector, 5.9” (15 cm) between connectors
- One cable with one SATA, two peripherals, and one floppy disk drive power connector, 16.9” (43 cm) to the first connector, 5.9” (15 cm) between connectors
All wires are 18 AWG, which is the correct gauge to be used.
The cable configuration is outstanding for a 300 W product, featuring one six-pin connector for video cards, which is almost never seen on power supplies below 450 W. The presence of four SATA power connectors is another plus.
Figure 3: Cables
Let’s now take an in-depth look inside this power supply.
[nextpage title=”A Look Inside the Huntkey Jumper 300G Planet3dnow.de Edition”]
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, and then in the following pages we will discuss in detail the quality and ratings of the components used.
Figure 4: Top view
Figure 5: Front quarter view
Figure 6: Rear quarter view
Figure 7: The printed circuit board
[nextpage title=”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 and two Y capacitors more than the minimum required.
Figure 8: Transient filtering stage (part 1)
Figure 9: Transient filtering stage (part 2)
In the next page we will have a more detailed discussion about the components used in the Huntkey Jumper 300G Planet3dnow.de Edition.
[nextpage title=”Primary Analysis”]
On this page we will take an in-depth look at the primary stage of the Huntkey Jumper 300G Planet3dnow.de Edition. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.
This power supply uses one T10KB80 rectifying bridge, attached to an individual heatsink. We couldn’t find the datasheet for this component, but we can easily assume it is a 10 A part, so in theory, you would be able to pull up to 1,150 W from a 115 V power grid. Assuming 80% efficiency, the bridge would allow this unit to deliver up to 920 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.
Figure 10: Rectifying bridge
The active PFC circuit uses one SPP20N60C3 MOSFET, which supports up to 20.7 A at 25° C or 13.1 A at 100° C in continuous mode (note the difference temperature makes), or 62.1 A at 25° C in pulse mode. This transistor presents 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.
Figure 11: Active PFC diode and transistor
The active PFC circuit is controlled by a CM6502 chip.
Figure 12: Active PFC controller
The electrolytic capacitor that filters the output of the active PFC circuit is Japanese, from Rubycon, and labeled at 105° C.
In the switching section, two STF15NM60ND MOSFETs are used. Each transistor supports up to 14 A at 25° C or 9 A at 100° C in continuous mode, or 56 at 25° C in pulse mode, with an RDS(on) of 299 mΩ.
Figure 13: Switching transistors
The switching transistors are connected using a design called LLC resonant, controlled by a CM6901 integrated circuit, which operates under PWM (Pulse Width Modulation) mode when the power supply is operating under light load but under FM (Frequency Modulation) mode under other loads. This controller was placed in the secondary section of the power supply, on the same printed circuit board as the rectifying transistors.
Figure 14: Resonant controller
Let’s now take a look at the secondary of this power supply.
[nextpage title=”Secondary Analysis”]
The Huntkey Jumper 300G Planet3dnow.de Edition uses a DC-DC design in its secondary, meaning that this power supply is basically a +12 V unit, with the +5 V and +3.3 V outputs being generated by two smaller switch-mode power supplies connected to the main +12 V output. This design is proving to be the best solution to achieve high efficiency. Also, this unit uses a synchronous design for the +12 V rectification. This means that the rectifying diodes were replaced with transistors in order to increase efficiency.
As briefly mentioned on the previous page, the +12 V rectifying diodes and the resonant controller are located on the same printed circuit board, which is located in the secondary of the power supply.
The +12 V output uses two IRFB3206 MOSFETs, each one capable of handling up to 210 A at 25° C or 150 A at 100° C in continuous mode, or up to 840 A at 25° C in pulse mode, with a maximum RDS(on) of only 3 mΩ. That is a brutal overspecification!
Figure 15: +12 V transistors
As explained, the +5 V and +3.3 V outputs are generated through two separate switch-mode power supplies, which are available as two add-on modules. Each power supply uses an APW7073 PWM controller and two IPD036N04L MOSFETs, each supporting up to 90 A at 25° C or 87 A at 100° C in continuous mode or up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of 3.6 mΩ.
Figure 16: One of the DC-DC modules
Figure 17: One of the DC-DC modules
This power supply uses a WT751002 monitoring integrated circuit. This is a very basic chip, supporting only over voltage (OVP) and under voltage (UVP) protections, and it doesn’t monitor the +12 V output for UVP. An AS339 voltage comparator creates the over current protection (OCP) circuit.
Figure 18: Monitoring circuit
This power supply uses two solid capacitors and three electrolytic capacitors from Fcon to filter the +12 V output. The +5 V and +3.3 V outputs are filtered using solid capacitors, as you can see in Figure 16.
[nextpage title=”Power Distribution”]
In Figure 19, you can see the power supply label containing all the power specs.
Figure 19: Power supply label
According to the label, this unit has two +12 V rails. We could find, on the printed circuit board, the two required current sensors (“shunts”). Th
ese reails are distributed like this:
- +12V1: All cables but the EPS12V/ATX12V
- +12V2: The EPS12V/ATX12V
This is the typical distribution used on power supplies with two +12 V rails.
How much power can this unit really deliver? Let’s find out.
[nextpage title=”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 +12V1 rail, while the +12VB input was connected to the power supply +12V2 rail (EPS12V connector).
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | 2 A (24 W) | 4 A (48 W) | 6 A (72 W) | 7.5 A (90 W) | 9.25 A (111 W) |
| +12VB | 1.5 A (18 W) | 3.75 A (45 W) | 5.5 A (66 W) | 7 A (84 W) | 9 A (108 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 A (5 W) | 1 A (5 W) | 1.5 A (7.5 W) | 2 A (10 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 | 61.6 W | 121.3 W | 183.4 W | 237.4 W | 301.4 W |
| % Max Load | 20.5% | 40.4% | 61.1% | 79.1% | 100.5% |
| Room Temp. | 44.3° C | 43.3° C | 42.9° C | 43.0° C | 43.6° C |
| PSU Temp. | 48.7° C | 48.2° C | 47.5° C | 47.3° C | 47.3° C |
| Voltage Regulation | Pass | Pass | Pass | Pass | Pass |
| Ripple and Noise | Pass | Pass | Pass | Pass | Pass |
| AC Power | 69.3 W | 133.1 W | 201.9 W | 265.3 W | 341.3 W |
| Efficiency | 88.9% | 91.1% | 90.8% | 89.5% | 88.3% |
| AC Voltage | 117.4 V | 115.6 V | 115.2 V | 114.6 V | 113.5 V |
| Power Factor | 0.971 | 0.982 | 0.982 | 0.982 | 0.983 |
| Final Result | Pass | Pass | Pass | Pass | Pass |
The performance of the Huntkey Jumper 300G Planet3dnow.de Edition was outstanding. It can really deliver its labeled power at high temperatures.
Efficiency was between 88% and 91%, easily surpassing the minimum requirements for the 80 Plus Gold certification, which are 87% minimum at light (20%) and full (100%) loads, and 90% minimum at typical (50%) load.
Voltages were closer to their nominal values (3% regulation) during all tests, which is terrific to see. The ATX12V specification says positive voltages must be within 5% of their nominal values, and negative voltages must be within 10% of their nominal values.
Noise and ripple levels were low at all times. Below you can see the results for the power supply outputs during test number five. The maximum allowed is 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.
Figure 20: +12VA input from load tester during test five at 301.4 W (23.6 mV)
Figure 21: +12VB input from load tester during test five at 301.4 W (28.4 mV)
Figure 22: +5V rail during test five at 301.4 W (14.6 mV)
Figure 23: +3.3 V rail during test five at 301.4 W (8.8 mV)
Let’s see if we can pull more than 300 W from this unit.
[nextpage title=”Overload Tests”]
Below you can see the maximum we could pull from this power supply. We couldn’t pull more than that because the power supply shut down, showing that its protections were working just fine. During this test voltages were still inside the tighter 3% regulation, noise and ripple levels were still low, and efficiency was still very high.
| Input | Overload Test |
| +12VA | 14 A (168 W) |
| +12VB | 14 A (168 W) |
| +5 V | 6 A (30 W) |
| +3.3 V | 6 A (19.8 W) |
| +5VSB | 2 A (10 W) |
| -12 V | 0.5 A (6 W) |
| Total | 401.6 W |
| % Max Load | 133.9% |
| Room Temp. | 44.7° C |
| PSU Temp. | 47.8° C |
| AC Power | 463.3 W |
| Efficiency | 86.7% |
| AC Voltage | 112.9 V |
| Power Factor | 0.987 |
[nextpage title=”Main Specifications”]
The main specifications for the Huntkey Jumper 300G Planet3dnow.de Edition power supply include:
- Standards: ATX12V 2.3 and EPS12V 2.92
- Nominal labeled power: 300 W
- Measured maximum power: 401.6 W at 44.7° C ambient
- Labeled efficiency: 80 Plus Gold certification (87% minimum at 20% and 100% loads, 90% minimum at 50% load)
- Measured efficiency: Between 88.3% and 91.1%, at 115 V (nominal, see complete results for actual voltage)
- Active PFC: Yes
- Modu
lar Cabling System: No - Motherboard Power Connectors: One 24-pin connector and two ATX12V connectors that together form an EPS12V connector
- Video Card Power Connectors: One six-pin connector
- SATA Power Connectors: Four on two cables
- Peripheral Power Connectors: Three on two cables
- Floppy Disk Drive Power Connectors: None
- Protections (as listed by the manufacturer): Over voltage (OVP), under voltage (UVP), over current (OCP), over power (OPP), and short-circuit (SCP) protections
- Are the above protections really available? Yes, but under voltage protection doesn’t monitor the +12 V rail
- Warranty: Three years
- More Information: https://www.huntkeydiy.com
- MSRP in Europe: € 64.90
[nextpage title=”Conclusions”]
We had our differences with Huntkey in the past, but we have to tip off our hat to them. The Jumper 300G Planet3dnow.de Edition is a remarkable power supply, maybe the only 300 W high-end unit available on the market today. This power supply can really deliver its labeled power at high temperatures. In fact, we could pull up to 400 W from it – a huge departure from older Huntkey power supplies that could only deliver 100 W below their labeled power. Voltages are closer to their nominal values than necessary (3% regulation), noise and ripple levels are very low, and efficiency is very high, between 88% and 91%. It also comes with a six-pin power connector for video cards, which is rarely seen on power supplies below 450 W.
If you are building a PC that won’t pull a lot of power (as a matter of fact, 300 W is more than enough for virtually all basic computers) and want to have “the best” power supply, the Jumper 300G Planet3dnow.de Edition is highly recommended.
Of course, high quality and high performance comes with a price. At € 64.90 (USD 94), it is a very expensive unit.