SilverStone SX800-LTI PSU Review

Teardown & Component Analysis

Parts Description

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. Finally, for the identification of tiny parts we use an Andonstar HDMI digital microscope.

General Data
Manufacturer (OEM)Enhance Electronics
Platform Model-
Primary Side
Transient Filter4x Y caps, 3x X caps, 2x CM chokes, 1x MOV, 2x CM02X
Inrush ProtectionNTC Thermistor & Diode
Bridge Rectifier(s)1x GBU15J (600V, 15A @ 100°C)
APFC MOSFETs2x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)
APFC Boost Diode1x CREE C3D10060A (600V, 10A @ 153°C)
Hold-up Cap(s)2x Rubycon USG (420V, 270uF each or 540uF combined, 3000h @ 85°C)
Main Switchers2x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)
Driver IC: Silicon Labs Si8230BD
APFC ControllerChampion CM6502S
LLC Resonant ControllerChampion CM6901
TopologyPrimary side: Half-Bridge & LLC Resonant Controller
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs8x Infineon BSC014N04LS (40V, 100A @ 100°C, 1.4mΩ)
5V & 3.3V4x Infineon BSC018NE2LS (25V, 97A @ 100°C, 1.8mΩ)
PWM Controller: 2x ANPEC APW7073
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (4-10,000 @ 105°C, KY), Nippon Chemi-Con (5-6000h @ 105°C, KZH), Rubycon (3-6000h @ 105°C, YXG), Rubycon (6-10,000h @ 105°C, ZLH)
Polymers: FPCAP, Suncon, Unicon (2000h @ 125°C, UPL)
Supervisor ICSITI PS223 (OVP, UVP, SCP, PG,OTP )
Fan ModelGlobe Fan S1201512HB (120mm, 12V, 0.45A, Sleeve Bearing)
5VSB Circuit
Rectifier1x PFR10V45CT SBR (45V, 10A) & 1x SG30N04D (60V, 56A @ 100°C, 8.4mΩ)
Standby PWM ControllerSanken STR-A6069H
-12V Circuit
RectifierSTMicroelectronics L7912CV (-12V, 1.5A)

Again, this PSU's OEM is SilverStone's favorite, Enhance Electronics. The design is modern. It features a half-bridge topology on the primary side, along with an LLC resonant converter. A number of FETs on the secondary side regulate the +12V rail, while the minor rails are handled by a couple of DC-DC converters. In general, the design looks good. A couple of large main transformers dominate the PCB's limited space.

Usually, such high-efficiency units utilize a bridge-less design in order to restrict energy losses on diodes. This time around, however, Enhance decided to go traditional and combat energy loss using FETs with lower RDS(on) values, among other tricks. The fact is that this platform achieves 80 PLUS Titanium efficiency, so clearly Enhance's methods for improving performance actually worked.

The transient filter starts at the AC receptacle with two X and two Y caps, and it continues on the main PCB with one more X cap and an additional pair of Y ones. There are also two CM chokes and an MOV; the latter provides protection against power surges and spikes. Finally, two CM02X ICs, installed on the PCB's solder side, are responsible for blocking current through an X cap's discharge (bleeding) resistor when AC voltage is connected. This enables a small efficiency increase and serves as a protection feature, since X caps tend to keep their charge for some time after power is removed.

A single GBU15J bridge rectifier is bolted on the primary heat sink, which we had to desolder in order to identify all major components.

An NTC thermistor lowers the current that the bulk caps require during the PSU's start-up phase. 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 caps come from Rubycon (420V, 270uF each or 540uF combined, 3000h @ 85°C), and their capacity is too low, preventing the PSU from achieving a hold-up time greater than 17ms. Moreover, it is disappointing to see 85°C bulk caps in a high-end PSU instead of 105°C ones.

The APFC controller is a Champion CM6502S IC. It's supported by a CM03X Green PFC controller that improves 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 main FETs' driver IC 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 modular PCB. Close to it we also find the protections IC, a SITI PS223.

Eight Infineon BSC014N04LS FETs regulate the +12V rail. That's exactly the same number and type used in SilverStone's ST80F-TI and ST60F-TI PSUs. Since these FETs are installed on the PCB's solder side, the chassis cools them through a thermal pad.

As usual, Enhance employs a mix of polymer and electrolytic capacitors to filter its rails. On the unit's secondary side, we find electrolytic caps from Chemi-Con (KY, KZH, 105°C) and Rubycon (YXG, ZLH, 105°C), along with polymer caps from FPCAP and the Japanese company Unicon, which also has factories in Taiwan and China.

A couple of DC-DC converters generate the minor rails. Each uses an Anpec APW7073 PWM controller and two Infineon BSC018NE2LS FETs.

A PFR10V45CT SBR regulates the 5VSB rail, while the standby PWM controller is a Sanken STR-A6069H IC. On the modular board, there's a SG30N04D FET most likely used to feed the 5VSB rail from the 5V one once the PSU starts.

The -12V rail is regulated by a STMicroelectronics L7912CV IC instead of the usual zener diode. This is a strong advantage; even if you overload (through a short) this rail, the PSU won't die.

On the modular board's face, five polymer Suncon caps and a single electrolytic one provide an extra ripple-filtering layer.

The soldering quality is very good, just as we'd expect from a high-end Enhance platform. Moreover, we don't find any long component leads. They've all been carefully trimmed.

A Globe Fan S1201512HB measures 120mm across and can rotate at more than 2200 RPM if needed. Unfortunately, the fan uses a sleeve bearing. That means it's rated for a much shorter lifetime than other bearing types (double ball, fluid/hydro dynamic etc.) In a PSU selling for ~$175, we'd like to see a higher-quality fan. We can't help but wonder why SilverStone approved this one for its flagship SFX-L model.

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  • shrapnel_indie
    I know a guy that used to work for SLM at one time in his life. On one of the products for the company brands owned, he could mod it (it was a musical instrument amplifier) for just a couple of pennies and could have saved the company large sums of money on warranty work and improve reliability. He proposed the change, and it was denied because it broke the price-point, and warranties would cover any issues anyway.

    When bean-counters run the show, products will suffer, just so the price-point isn't exceeded and (now days particularly, immediate) profits are maximized. Makes me wonder if Silverstone listened to their bean-counters a little too much.
  • Aris_Mp
    The thing I appreciate in SilverStone is that they didn't follow the marketing war in the warranty periods. For me it is really weird to see 10-12 years warranty in PSUs. Now with the mining craziness many companies are trying to find ways to get out of this.
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  • SilverStone Guy
    Anonymous said:
    When bean-counters run the show, products will suffer, just so the price-point isn't exceeded and (now days particularly, immediate) profits are maximized. Makes me wonder if Silverstone listened to their bean-counters a little too much.

    If bean-counters had their way, a PSU like this would have never been released in the first place! It's a very niche product that will not sell in significant quantities. Implementing sleeve bearing fan was not a cost-cutting move, it was out of necessity to keep the PSU noise low for the intended applications. At the time of development, FDB version of this fan was not yet available to us.