Seasonic Prime Titanium Fanless 600W PSU Review

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Teardown & Component Analysis

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General Data
Manufacturer (OEM)Seasonic
Platform ModelPrime Fanless
Primary Side
Transient Filter6x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC Thermistor & Relay
Bridge Rectifier(s)2x Vishay LVB2560 (600V, 25A @ 105°C)
APFC MOSFETs2x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)
APFC Boost Diode1x 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 Switchers4x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)
Drivers For Main Switchers2x Silicon Labs Si8230BD
APFC ControllerON Semiconductor NPC1654
Switching ControllerChampion CM6901
TopologyPrimary side: Full-Bridge & LLC Resonant Converter Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs4x Infineon BSC014N04LS (40V, 100A @ 25°C, 1.4mΩ)
5V & 3.3VDC-DC Converters: 6x Infineon BSC0906NS PWM Controller: APW7159
Filtering CapacitorsElectrolytics: 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 ICWeltrend WT7527V (OVP, UVP, OCP, SCP, PG ) & AS393M
5VSB Circuit
Buck ConverterAME5268 (3A)
RectifiersSTMicroelectronics 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.

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Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.