Silverstone Reference SFX Series Power Supply
About Silverstone
SilverStone Technology is a well-known company in the computer hardware industry that specializes in designing and manufacturing computer components and accessories. They are particularly renowned for their high-quality computer cases, power supplies, cooling solutions, and various other PC peripherals.
SilverStone was founded in 2003 in Taiwan and has since established a solid reputation for producing innovative and aesthetically appealing products. They cater to a wide range of consumers, including PC enthusiasts, gamers, and professionals who seek reliable and high-performance hardware for their computing needs.
SPECIFICATION
GENERAL DESCRIPTION AND SCOPE
This is the specification of Model SX300-B, SX450-B AC-line powered switching power supply with active PFC (Power Factor Correction) circuit, which meets EN61000-3-2 features.
The specification below is intended to describe as detailed as possible the functions and performance of the subject power supply. Any comment or additional requirements to this specification from our customers will be highly appreciated and treated as a new target for us to approach.
INPUT ELECTRICAL SPECIFICATIONSTIONS
AC INPUT
| Parameter | Min. | Nom. | Max. | Unit |
| Vin (115Vac) | 90 | 115 | 135 | VAC rms |
| Vin (230Vac) | 180 | 230 | 265 | VAC rms |
| Vin Frequency | 47 | — | 63 | HZ |
Maximum inrush current from power-on (with power on at any point on the AC sine) and including, but not limited to, three line cycles, shall be limited to a level below the surge rating of the input line cord, AC switch if present, bridge rectifier, fuse, and EMI filter components. Repetitive ON/OFF cycling of the AC input voltage should not damage the power supply or cause the input fuse to blow.
INPUT LINE CURRENT & POWER FACTOR (P.F.)
SX300-B (At Full load)
| AC input | Input line current | P.F.@ Full Load |
| 115V | < 4.5Amps – rms | > 0.95 |
| 230V | < 2Amps – rms | > 0.95 |
SX450-B
| AC input | Input line current | P.F.@ Full Load |
| 115V | < 5.5Amps – rms | > 0.95 |
| 230V | <3.0Amps – rms | > 0.95 |
AC-DC power supplies shall not perform at less than:
(AC input=230V)
- Power factor 0.8 at 20% of rated output.
- Power factor 0.9 at 50% of rated output.
- Â Power factor 0.95 at 100% of rated output.
EFFICIENCY
Under the load conditions defined in Table 1. And table 2. The loading condition for testing efficiency shown in Table 1 represents a fully loaded system. A ~ 50% (typical) loaded system and a ~ 20% (light) loaded system.
Table1. Loading Table for Efficiency Measurements
| 300W(loading shown in Amps) | |||||
| Load | +3.3V | +5V | +12V | -12V | +5Vsb |
| Light | 1.99 | 1.99 | 3.44 | 0.04 | 0.34 |
| Typical | 4.97 | 4.97 | 8.6 | 0.1 | 0.86 |
| Full | 9.95 | 9.95 | 17.2 | 0.21 | 1.72 |
| 450W(loading shown in Amps) | |||||
| Load | +3.3V | +5V | +12V | -12V | +5Vsb |
| Light | 2.22 | 2.22 | 5.76 | 0.05 | 0.38 |
| Typical | 5.55 | 5.55 | 14.4 | 0.12 | 0.96 |
| Full | 11.1 | 11.1 | 28.79 | 0.23 | 1.92 |
Standby Power Consumption (+5Vsb):
- Efficiency > 45% @ 5Vsb/45mA &230Vac input (2013 Lot 6)
- Efficiency > 75% @ 5Vsb/550mA &230Vac input
- Efficiency > 75% @ 5Vsb/1A &230Vac input
- Efficiency > 75% @ 5Vsb/1.5A &230Vac input
- Efficiency > 75% @ 5Vsb/2.5A &230Vac input
OUTPUT ELECTRICAL REQUIREMENTS
OUTPUT VOLTAGE AND CURRENT RATING
SX300-B
| Output | MINIMUM LOAD | NORMAL LOAD | MAXIMUM LOAD | PEAK
LOAD |
LOAD REG. | LINE REG. | Ripple &
Noise |
| +3.3V | 0A | 10A | 20A | – | ±5% | ±1% | 50mV P-P |
| +5V | 0A | 10A | 20A | – | ±5% | ±1% | 50mV P-P |
| +12V | 0.1A | 12.25A | 25A | – | ±3% | ±1% | 120mV P-P |
| -12V | 0A | 0.15A | 0.3A | – | ±10% | ±1% | 120mV P-P |
| +5Vsb | 0A | 1.25A | 2.5A | – | ±5% | ±1% | 50mV P-P |
- +3.3V & +5V total output not exceed 120W.
- The maximum combined current for the +12V outputs shall be 25A.
SX450-B
| Output | MINIMUM LOAD | NORMAL LOAD | MAXIMUM LOAD | PEAK
LOAD |
LOAD REG. | LINE REG. | Ripple &
Noise |
| +3.3V | 0A | 10A | 20A | – | ±5% | ±1% | 50mV P-P |
| +5V | 0A | 10A | 20A | – | ±5% | ±1% | 50mV P-P |
| +12V | 0.1A | 18.75A | 37.5A | – | ±3% | ±1% | 120mV P-P |
| -12V | 0A | 0.15A | 0.3A | – | ±10% | ±1% | 120mV P-P |
| +5Vsb | 0A | 1.25A | 2.5A | – | ±5% | ±1% | 50mV P-P |
- +3.3V & +5V total output not exceed 120W.
- Â The maximum combined current for the +12V outputs shall be 37.5A.
Voltages and ripple are measured at the load side of mating connectors with a 0.1uF monolithic ceramic capacitor paralleled by a 10uF electrolytic capacitor across the measuring terminals.
LOAD CAPACITY SPECIFICATIONS
The cross-regulation is defined as follows, the voltage regulation limits DC include DC Output ripple & noise.
SX300-B
| LOAD | +3.3V | +5V | +12V | -12V | +5Vsb |
| Condition_1 | X | X | X | X | 2.5A |
| Condition_2 | 0A | 0A | 0.1A | 0A | 0A |
| Condition_3 | 0A | 0A | 1A | 0.3A | 0.1A |
| Condition_4 | 0A | 0A | 20A | 0.1A | 0.1A |
| Condition_5 | 1A | 12.8A | 1A | 0.1A | 0.1A |
| Condition_6 | 12.8A | 1A | 1A | 0.1A | 0.1A |
| Condition_7 | 20A | 10.8A | 13.65A | 0.3A | 2.5A |
| Condition_8 | 6.06A | 20A | 13.65A | 0.3A | 2.5A |
| Condition_9 | 0A | 0A | 25A | 0.1A | 0.3A |
SX450-B
| LOAD | +3.3V | +5V | +12V | -12V | +5Vsb |
| Condition_1 | X | X | X | X | 2.5A |
| Condition_2 | 0A | 0A | 0.1A | 0A | 0A |
| Condition_3 | 0A | 0A | 1A | 0.3A | 0.1A |
| Condition_4 | 0A | 0A | 30A | 0.1A | 0.1A |
| Condition_5 | 1A | 12.8A | 1A | 0.1A | 0.1A |
| Condition_6 | 12.8A | 1A | 1A | 0.1A | 0.1A |
| Condition_7 | 20A | 10.8A | 26.16A | 0.3A | 2.5A |
| Condition_8 | 6.06A | 20A | 26.16A | 0.3A | 2.5A |
| Condition_9 | 0A | 0A | 37.5A | 0.1A | 0.5A |
OVER-VOLTAGE PROTECTION
| Voltage Source | Over Voltage Protection Point |
| +3.3V | 3.76V-4.8V |
| +5V | 5.75V-7.0V |
| +12V | 13.5V-16.5V |
SHORT CIRCUIT PROTECTION
Output short circuit is defined to be a short circuit load of less than 0.1 ohm. In the event of an output short circuit condition on +3.3V, +5V, +12V or –12V output, the power supply will shut down and latch off without damage to the power supply. The power supply shall return to normal operation after the short circuit has been removed and the power switch has been turned off for no more than 2 seconds.
OVER CURRENT PROTECTION
Test: Typical load
SX300-B
| OUTPUT VOLTAGE | Over current limit |
| +3.3V | 19.2A~24A |
| +5V | 19.2A~24A |
SX450-B
| OUTPUT VOLTAGE | Over current limit |
| +3.3V | 18A~30A |
| +5V | 18A~30A |
OVER POWER PROTECTION
SX300-B
The power supply shall be shut down and latch off when the output wattage of the power supply is higher from 360W to 450W.
SX450-B
The power supply shall be shut down and latch off when the output wattage of the power supply is higher from 495W to 630W.
UNDER VOLTAGE PROTECTION
| OUTPUT VOLTAGE | Under voltage |
| +3.3V | 2.4V~2.0V |
| +5V | 3.7V~3.3V |
| +12V | 9.5V~8.5V |
POWER SIGNAL
| Power good @230V,Full load | 100–500mSec. |
| Power fail @230V,Full load | 1mSec. minimum |
- T1: Power-on time shall be less than 500 ms (T1 < 500 ms)
- T2: Rise time: 0.1 ms to 20 ms (0.1 ms ≤T2 ≤20 ms)
- T3: Power-ok delay time: 100 ms < T3 < 500 ms
- T4: Power-ok rise time: T4 < 10ms
- T5 + T6: AC loss to PWR_OK hold-up time
OUTPUT RISE TIME
(10% TO 95% OF FINAL OUTPUT VALUE @ Full load of Table 1) 115V-rms or 230V-rms: +12V&+5V&+3.3V&-12V&+5Vsb: 20ms Maximum
HOLD-UP TIME (80% Full load)
115V / 60Hz : 17 mSec. Minimum. ; 230V / 50Hz : 17 mSec. Minimum
The output voltage will remain within specification, in the event that the input power is removed or interrupted, for the duration of one cycle of the input frequency. The interruption may occur at any point in the AC voltage cycle. The power good signal shall remain high during this test.
Dynamic
SX300-B
| LOAD | +3.3V | +5V | +12V | -12V | +5Vsb |
| +3.3V | 9.6A~16A | 6.44A | 16.58A | 0.3A | 2.5A |
| +5V | 1.67A | 9.6A~16A | 16.58A | 0.3A | 2.5A |
| +12V | 0A | 0A | 15~25A | 0.1A | 0.1A |
| Capacitive Load | 3300uF | 3300uF | 3300uF | 330uF | 3300uF |
SX450-B
| LOAD | +3.3V | +5V | +12V | -12V | +5Vsb |
| +3.3V | 9.6A~16A | 6.44A | 16.58A | 0.3A | 2.5A |
| +5V | 1.67A | 9.6A~16A | 16.58A | 0.3A | 2.5A |
| +12V | 0A | 0A | 15~25A | 0.1A | 0.1A |
| Capacitive Load | 3300uF | 3300uF | 3300uF | 330uF | 3300uF |
FAN NOISE REQUIREMENTS
The subject power supply is cooled by a self-contained, 80mm, 12VDC fan.
FAN NOISE
| AC INPUT | Full load | Typical load | Light load |
| 115V | Â
Noise < 45dB |
Â
Noise < 30dB |
Â
Noise < 30dB |
| 230V |
ENVIRONMENTAL REQUIREMENTS
The power supply will be compliant with each item in this specification for the following environmental conditions.
TEMPERATURE RANGE
| Operating | +0 to +40 deg. C |
| Storage | -20 to +70 deg. C |
HUMIDITY
| Operating | 5 – 95% RH, Non-condensing |
| Storage | 5 – 95% RH, Non-condensing |
SAFETY TESTING
- GROUND LEAKAGE CURRENT The power supply ground leakage current shall be less than 3.5 mA.
- DIELECTRIC STRENGTH
- Primary to Frame Ground: 1800Vac for 1 sec.
- Primary to Secondary: 1800Vac for 1 sec
- INSULATION RESISTANCE
- Primary to Frame Ground: 20M ohm,
- Minimum Primary to Secondary: 20M ohm, Minimum
- RELIABILITY The power supply reliability, When calculated by MIL-HDBK-217; the latest revision, exceeds 100,000 hours with all output at maximum load and an ambient temperature of 25 ℃ .
MECHANICAL SPECIFICATIONS
The mechanical drawing of the subject power supply, which indicates the form factor, location of The mounting holes, location, the length of the connectors, and other physical specifications of the subject power supply. Please refer to the attached drawing.
POWER SUPPLY CONNECTOR OVERUSE DEFINITION
A single PCIe 8-pin cable and connector’s maximum current rating is 12.5A, which is 150W (+12V x 12.5A). So SilverStone’s warranty will not cover damages or malfunction resulting from the use of a graphics card or expansion card with a single PCIe 8pin connector that exceeds the standard 225W total power draw (150W from PCIe 8pin connector + 75W from PCIe motherboard slot). Similarly, a graphics card or expansion card with dual PCIe 8pin connectors that exceed 375W total power draw (300W from two PCIe 8-pin connectors + 75W from PCIe motherboard slot) will also not be covered under warranty.
Peripheral (Molex) or SATA connector’s maximum current rating is 5A, which is 60W (+12V x 5A) or 25W (+5V x 5A). Please ensure connected devices are operating under these limits. SilverStone’s warranty will not cover damages or malfunction resulting from usage exceeding these connectors and their associated cables.
24pin motherboard connector’s maximum current rating for its dual +12V metal pins are 5A each, which totals 120W (+12V x 5A x 2). Please ensure +12V drawing devices connected to the motherboard are operating under these limits. SilverStone’s warranty will not cover damages or malfunction resulting from usage exceeding these connectors and their associated cables.
FAQs Silverstone Reference SFX Series Power Supply
What does the power supply term SFX mean?
SFX PSUs. Small Form Factor, or SFX, is a PSU standard made for smaller, space-constrained PCs with little room for cooling. Typically measuring 125 x 63.5 x 100 mm, SFX PSUs are smaller than ATX or EPS PSUs and can fit in some mini-ITX or micro-ATX cases.
Is SilverStone a reliable PSU brand?
Excellent PSUs are made by SilverStone. For the past ten years, I’ve utilized SilverStone Tek PSUs. One was installed in an Alienware box starting around 2005, and I purchased a second one in 2011 since I thought a PSU that had lasted in a powerful gaming PC for around 6 years was plenty for me.
What distinguishes the SFX and SFX-L power supplies?
An SFX-L PSU, the bigger version of the SFX, typically measures 125 x 125 x 63.5mm. SFX-L power supplies are made to be compact and can yet fit in cases as small as a micro-ATX.
What does SFX stand for?
The term “SFX” can refer to any special effect, but it is most frequently used to refer to sound effects in movies and television.
An SFX power supply’s depth is how deep?
The dimensions of a typical SFX power supply are 125mm 63.5mm x 100mm, not including the length of the PSU wires that protrude.
What does SFX’s entire name mean?
Illusions and special effects, typically visual, are utilized in entertainment and movies.
SFX technology: what is it?
A software program called SFX, which stands for special effects, makes it simple to build specific types of hypertext links within a collection of information, like the description of a library collection.
Can any case accommodate an SFX power supply?
The larger ATX cases should typically have no trouble accommodating an SFX PSU. However, it’s crucial to check the manufacturer’s specs as well as whether any adapters are required to install the PSU correctly if you’re using a smaller case, like an ITX or micro-ATX.
A modular power supply unit is what?
For your motherboard, CPU, GPU, and other devices, a power supply is an essential component that transforms AC power from the wall outlet to DC power.
What type of power supply does ATX use?
Advanced Technology Extended Power Supply is the abbreviation for this power supply. The motherboard and the CPU each have their own main power connector on the AT power supply.
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