Page 1:SilverStone ST80F-TI Power Supply Review
Page 2:Packaging, Contents, Exterior And Cabling
Page 3:A Look Inside And Component Analysis
Page 4:Load Regulation, Hold-Up Time And Inrush Current And Protections
Page 5:Efficiency, Temperature And Noise
Page 6:Protection Features Evaluation
Page 7:Cross-Load Tests And Infrared Images
Page 8:Transient Response Tests
Page 9:Ripple Measurements
Page 10:Performance, Performance Per Dollar, Noise and Efficiency Ratings
Page 11:Pros, Cons And Final Verdict
A Look Inside And 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. Our main tools for disassembling PSUs are a Thermaltronics soldering and rework station, and a Hakko FR-300 desoldering gun.
|Transient Filter||4x Y caps, 4x X caps, 2x CM chokes, 1x MOV, CM02X|
|Inrush Protection||NTC Thermistor|
|Bridge Rectifier(s)||2x Vishay BU1506 (600V, 15A @ 150 °C)|
|APFC MOSFETs||2x Infineon IPP50R140CP (550V, 15A @ 100 °C, 0.14Ω)|
|APFC Boost Diode||1x CREE C3D10060A (600V, 8A @ 153 °C)|
|Hold-up Cap(s)||1x Panasonic (450V, 560uF, 2000h @ 105 °C, HD)|
|Main Switchers||2x Infineon IPP50R140CP (550V, 15A @ 100 °C, 0.14Ω)|
Driver IC: 1x Silicon Labs Si8230BD
|APFC Controller||Champion CM6502S & CM03X Green PFC controller|
|Switching Controller||Champion CM6901|
|Topology||Primary side: Half-Bridge & LLC Resonant Converter|
Secondary side: Synchronous Rectification & DC-DC converters
|+12V MOSFETs||8x Infineon BSC014N04LS (40V, 100A @ 100 °C, 1.4mΩ)|
|5V & 3.3V||DC-DC Converters: |
2x BSC050NE2LS FETs (25V, 37A @ 100 °C, 5.0mΩ)
2x BSC018NE2LS FETs (25V, 97A @ 100 °C, 1.8mΩ)
PWM Controller: 2x APW7073
|Filtering Capacitors||Electrolytics: |
|Supervisor IC||SITI PS223 (OVP, UVP, OCP, SCP, OTP )|
|Fan Model||Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, 2200 RPM, FDB)|
|Rectifier||1x PFR10V45CT & 1x SG30N04D|
|Standby PWM Controller||Sanken STR-A6069H|
As mentioned, this PSU's OEM is Enhance Electronics. Most of SilverStone's products, in fact, are based on Enhance's platforms. Although the manufacturer is reputable, it still doesn't offer the ground-breaking performance achieved by competing OEMs. The ST80F-TI doesn't utilize a bridge-less PFC design, so it won't be able to meet the efficiency levels of high-end Titanium-class designs under high loads, where energy losses are the worst.
Regardless, the PSU's mainboard is designed cleanly and its heat sinks are quite large for a Titanium-rated PSU. On the secondary side, the heat sinks aren't attached to anything since the +12V FETs are installed on the PCB's solder side. Instead, the chassis plays a key role in cooling them. All electrolytic caps are provided by Japanese manufacturers, while the polymer caps are sourced from Taiwanese companies. Finally, an LLC resonant converter is used on the primary side, while a synchronous design is utilized on the secondary side, along with two DC-DC converters for generating the minor rails.
Differences with the ST60F-TI are minimal; really, they're limited to the APFC's boost diode and the bulk cap. This leaves us wondering why SilverStone didn't use lower-rated components in the ST60F-TI to reduce its production cost.
The transient filter starts at the AC receptacle with two X and two Y caps and it continues on the main PCB with two more X caps and an additional pair of Y ones. There are also two CM chokes and an MOV (Metal Oxide Varistor), the latter providing protection against power surges and spikes. Finally, a CM02X IC, installed on the PCB's solder side, is responsible for blocking current through an X cap's discharge (bleeding) resistor when AC voltage is connected. This enables a small efficiency increase.
The bridge rectifiers (Vishay BU1506s) can handle up to 30A of current.
An NTC thermistor lowers the current that the bulk caps require during the PSU's start-up phase. Normally this thermistor is supported by a bypass relay, which adds a small efficiency boost and allows it to cool down quickly.
Two Infineon IPP50R140CP FETs are used in the APFC converter, along with a single CREE C3D10060A boost diode. The bulk cap is by Panasonic (450V, 560uF, 2000h @ 105 °C, HD), and its capacity is too low, preventing the PSU from achieving a hold-up time greater than 17ms.
The APFC controller is a Champion CM6502S IC, which is supported by a CM03X Green PFC controller that's responsible for improving efficiency in standby mode. Both ICs are installed onto a small daughterboard.
The primary switchers are a couple of Infineon IPP50R140CP FETs arranged into a half-bridge topology. The driver IC of the main FETs is a Silicon Labs Si8230BD IC. An LLC resonant converter is used for increased efficiency.
The resonant controller is a Champion CM6901 IC installed on the PCB's solder side. Right next to it is the protections IC, a SITI PS223.
The pair of small heat sinks on the secondary side doesn't host any components, except for a couple of thermistors that provide temperature data to the fan control circuit and supervisor IC for over-temperature protection.
Eight Infineon BSC014N04LS FETs regulate the +12V rail. That's exactly the same number and type used in SilverStone's ST60F-TI PSU. Since these FETs are installed on the PCB's solder side, the chassis cools them.
Filtering on the secondary side is addressed with a mix of electrolytic caps provided by Chemi-Con (KY, KZH, 105 °C) and Rubycon (ZLH, YXG, 105 °C), along with polymer caps from the Taiwanese company Unicon.
A PFR10V45CT SBR regulates the 5VSB rail, while the standby PWM controller is a Sanken STR-A6069H IC. On the solder side of the mainboard is a SG30N04D FET, which most likely is used to feed the 5VSB rail from the 5V one once the PSU starts.
At the modular PCB's front side, a number of polymer and electrolytic caps provide an extra ripple filtering layer. The electrolytic caps are provided by Suncon.
The soldering quality is pretty good overall. We did spot some PCB traces reinforced by copper wires to increase their conductivity.
The cooling fan is by Hong Hua and its model number is HA1225H12F-Z (120mm, 12V, 0.58A, 2200 RPM). It uses a FDB, so it should last a long time. SilverStone's fan profile is loose at normal ambient temperatures. Under higher thermal loads, however, expect the fan to make its presence known.
- SilverStone ST80F-TI Power Supply Review
- Packaging, Contents, Exterior And Cabling
- A Look Inside And Component Analysis
- Load Regulation, Hold-Up Time And Inrush Current And Protections
- Efficiency, Temperature And Noise
- Protection Features Evaluation
- Cross-Load Tests And Infrared Images
- Transient Response Tests
- Ripple Measurements
- Performance, Performance Per Dollar, Noise and Efficiency Ratings
- Pros, Cons And Final Verdict