Page 3 - Physical Look - Inside
As we usually do, we opened up the Seasonic PRIME 600 Titanium Fanless 600W power supply to take a closer look at what is going on inside. Opening up this power supply will void your twelve year warranty, as the warranty seal covers one of the screws. For your benefit, we voided our warranty on this unit so you do not need to. There are zero user serviceable parts inside anyway. Removing the top shell from the power supply is pretty easy, as we just remove the four screws at the top. The OEM for the Seasonic PRIME 600 Titanium Fanless 600W is obviously Seasonic, as they have always made their own units. The photo above shows an overhead view of its internal components. Build quality look good on first glance with very few globs of glue around the unit. Seasonic makes some of the best power supplies, so we will see how this affects the build quality. Otherwise, there are many heatsinks found around the unit in a natural silver finish.
The transient filter stage is the initial stage of any computer power supply, so we will take a closer look at this first. From here, Seasonic has covered this area with a metal and plastic enclosure. Underneath, near the AC receptacle, two X-capacitors, two Y-capacitors, and a fuse are installed here. On the second part of the input, we have one more X-capacitor and four Y-capacitors. This should be a sufficient amount of X- and Y-capacitors. Two CM chokes and an MOV exist here to also protect your power supply from AC line voltage spikes.
On the primary side, there are two Hitachi HU capacitors connected in parallel. One has a rating of 470uF at 400V while the other has a rating of 390uF at 400V. This makes for a total capacitance of 860uF. Both of these capacitors also have temperature ratings of 105c. I have not seen many Hitachi capacitors, though our recent GAMDIAS unit did use one. It is great to see Japanese capacitors here, though it is not a huge surprise for Seasonic, as they generally provide better reliability and boast a longer lifetime. A higher 105c temperature rating is also great to see, as some cheaper capacitors are only rated at 85c.
The power supply uses two Vishay LVB2560 rectifying bridges attached to a heatsink, supporting up to 25A of current at 105c. At 115V, the theoretical power you can pull from the bridge rectifier is 5750W (25A * 2 diodes * 115V) at 100% efficiency. Of course, this is purely from the bridge rectifier, and not all components in the power supply can actually hold this workload. Even so, this is well above the necessary requirements for a 600W power supply. The active PFC circuit in the Seasonic PRIME 600 Titanium Fanless 600W has two Infineon IPP50R140P MOSFETs. These transistors are rated to deliver 15A at 100 degrees Celsius continuously. Each IPP5R140P has a maximum resistance of 0.14 ohms. This on characteristic is called Static Drain-Source On-Resistance or commonly abbreviated as RDS(on). The more efficient the component is, the lower the RDS(on) value, since it wastes less power with lower resistance. A single CREE D0665C5 Schottky diode is also found in the active PFC circuit and cooled on the same metal heatsink. Four more Infineon IPP50R140P MOSFET transistors can be found attached to another metal heatsink and they act as the main switchers. The switching controller here is Champion's CM6901.
On the secondary side, we can see more Japanese made capacitors from Chemi-con and Nichicon, all rated at 105c. As with modern high efficiency power supplies, all rectifiers produce the +12V out -- while the +5V and +3.3V outputs are generated from the +12V output using a DC to DC converter within the power supply unit. Most of these secondary components are actually hidden under a metal heatsink on the backside of the rear panel, with several thermal pads to aid in dispersing heat. This includes the ANPEC APW7159 synchronous buck PWM controller and six Infineon BSC0906NS MOSFETs responsible for generating the +5V and +3.3V outputs. The BSC0906NS's rated continuous drain current is 40A at 100c and a pulsed drain current of 252A. Drain source voltage is rated at 30V and a RDS(on) value of 0.0045 ohm maximum and 0.0038 ohm typical. Underneath the main board, four Infineon BSC014N04LS MOSFETs are responsible for generating the +12V output. The BSC014N04LS's rated continuous drain current is 40A at 100c and a pulsed drain current of 100A. Drain source voltage is rated at 40V, and a RDS(on) value of 0.0014 ohm maximum and 0.0011 ohm typical. These too are passively cooled with thermal pads in contact with the metal enclosure. Meanwhile, a Weltrend WT7527V IC is located on a side daughterboard, and it provides over/under current and over/under voltage protection. The datasheets for all components mentioned in this review can be found on their respective manufacturer's websites.
At the back, we have a large daughterboard covering the entire rear panel for the modular cable sockets. All modular sockets at the bottom are soldered directly to the main PCB after the secondary stage to reduce power transmission loss. The output connector configuration can be seen on the previous page. After looking at the insides, the internal build quality of Seasonic's PRIME 600 Titanium Fanless 600W power supply is superb. Components are arranged beautifully for optimal cooling with almost no wires running around inside, and solder points on its green PCB are very clean in general. This last point is especially crucial for a fanless unit like this one, so let us see what some minor tests will produce.
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion