Teardown & Component Analysis
Before proceeding with this page we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.
|Platform Model||Prime Fanless|
|Transient Filter||6x Y caps, 3x X caps, 2x CM chokes, 1x MOV|
|Inrush Protection||NTC Thermistor & Relay|
|Bridge Rectifier(s)||2x Vishay LVB2560 (600V, 25A @ 105°C)|
|APFC MOSFETs||2x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)|
|APFC Boost Diode||1x CREE C3D06060A (600V, 6A @ 154°C)|
|Hold-up Cap(s)||1x Nippon Chemi-Con (400V, 450uF, 2000h @ 105°C, CE) 1x Nippon Chemi-Con (400V, 390uF, 2000h @ 105°C, CE)|
|Main Switchers||4x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)|
|Drivers For Main Switchers||2x Silicon Labs Si8230BD|
|APFC Controller||ON Semiconductor NPC1654|
|Switching Controller||Champion CM6901|
|Topology||Primary side: Full-Bridge & LLC Resonant Converter Secondary side: Synchronous Rectification & DC-DC converters|
|+12V MOSFETs||4x Infineon BSC014N04LS (40V, 100A @ 25°C, 1.4mΩ)|
|5V & 3.3V||DC-DC Converters: 6x Infineon BSC0906NS PWM Controller: APW7159|
|Filtering Capacitors||Electrolytics: Nippon Chemi-Con (105°C, W), Nippon Chemi-Con (4000-10,000h @ 105°C, KY), Nippon Chemi-Con (4000-10,000h @ 105°C, KYB), Rubycon (5VSB circuit, 3000-6000h @ 105°C, YXG), Nichicon (4000-10,000h @ 105°C, HE) Polymers: FPCAP, Nippon Chemi-Con|
|Supervisor IC||Weltrend WT7527V (OVP, UVP, OCP, SCP, PG ) & AS393M|
|Buck Converter||AME5268 (3A)|
|Rectifiers||STMicroelectronics STU6N65K3 (650V, 3A @ 100°C, 1.3Ω), 6A4 SBR (400V, 6A @ 75°C), Infineon BSC0906NS (30V, 40A @ 100°C, 4.5 mΩ)|
This is the best analog platform available. Seasonic's engineers managed to work wonders without leaning on digital controllers. Nonetheless, it is high time for Seasonic to start working on digital desktop PSUs. A lot of brands want these in their portfolios, and once they're mature, they'll offer much higher efficiency and performance than analog designs.
The SSR-600TL uses a full bridge topology on its primary side that's supported by an LLC resonant converter. It doesn't employ a bridgeless PFC design, though, which is usually found in high-efficiency platforms. On the secondary side, a couple of DC-DC converters handle the minor rails. All of the filtering capacitors that Seasonic uses are of good quality, with a majority of them being polymer.
Interestingly, this PSU is identical to the 650W Prime Titanium that we reviewed a while ago. The major differences between them, aside from a missing fan, are the bulk caps' lower combined capacity, the different APFC and primary switching FETs, and the +12V FETs. In the SSR-600TL, they have a lower RDSon value. We found some differences in the 5VSB rail's regulation circuit components as well.
The following video shows the SSR-600TL’s internals.