SilverStone ST55GF User Manual

ST55GF

550W + 550W PS/2 redundant power supply

Hot swappable

Industry-leading reliability

Durable zinc-plated surface

Convenient pull-out handle bars

SPECIFICATION

SilverStone Gemini ST55GF

Mini Redundant Power Supply

With Active PFC

550W + 550W

1. General

This specification describes the electrical characteristics, functional and physical of a
550W+550W=550 watts redundant power supply with Active PFC (Power Factor
Correction) and hot-swappable capabilities.

2. AC Input Characteristics

2.1 AC Input Voltage and Frequency (Rating: 100V-240Vac, 47-63Hz, 10-5A)

The power supply must operate within all specified limits over the input voltage range in
Table 1.
Harmonics distortion of up to 10% THD must not cause the power supply to go out of
specified limits.

Parameter Rated Minimum Maximum

132 Vac 8 AVoltage (115V) 90 Vac 100-120Vac

Voltage (230V) 180 Vac 200-240Vac

Frequency 47 Hz 50 / 60 Hz 63 Hz

2.2 AC Inrush Current

AC line inrush current shall not damage any component nor cause the AC line fuse to blow
under any DC conditions and with any specified AC line input voltage and frequency.
Repetitive On/Off cycling of the AC input voltage shall not damage the power supply.

264Vac 4 A

Table 1 - AC Input Voltage and Frequency

Max.

Input Current

01

2.3 Input Power Factor Correction (Active PFC)

ST55GF

The power factor at full load shall be ••0.95 at nominal input voltage.

0.98

2.4 Input Current Harmonics

When the power supply is operated in 90-264Vac of Sec. 2.1, the input harmonic current
drawn on the power line shall not exceed the limits set by EN61000-3-2 class "D" standards.
The power supply shall incorporate universal power input with active power factor
correction.

2.5 AC Line Dropout

An AC line dropout of 17mS or less shall not cause any tripping of control signals or
protection circuits. If the AC dropout lasts longer than 17mS the power supply should
recover and meet all turn on requirements. The power supply shall meet the regulation
requirement ove r all rated AC voltages, frequencies, and output loading conditions. Any
dropout of the AC line shall not cause damage to the power supply. An AC line dropout is
defined as a drop in AC line to 0VAC at any phase of the AC line for any length of time.

2.6 AC Surge Voltages

The power supply shall be tested and be compliant with the requirements of IEC61000-4-5
Level 3 criteria for surge withstand capability, with the following conditions and exceptions.
The test equipment and calibrated waveforms shall comply with the requirements of
IEC61000-4-5 for open circuit voltage and short circuit current.

X

These input transients must not cause any out of regulation conditions, such as
overshoot and undershoot, nor must it cause any nuisance trips of the power supply
protection circuits.

X

The surge-withstand test must not produce damage to the power supply.

X

The power supply must meet surge-withstand test condition under maximum and
minimum DC output load conditions.

2.7 Surge Immunity, IEC61000-4-5

The peak value of the unidirectional surge waveform shall be 2KV for common mode and
1KV for differential mode of transient surge injection. No unsafe operation or no user
noticeable degradation is allowed under any condition. Automatic or manual recovery is
allowed for other conditions.

2.8 Electrical Fast Transient / Burst, IEC61000-4-4

No unsafe operation allowed under any condition. No user noticeable performance
degradation up to 1KV is allowed.Automatic or manual recovery is allowed for other
conditions.

02

2.9 Electrical Discharge, IEC61000-4-2

In addition to IEC61000-4-2, the following ESD tests should be conducted. Each surface
area of the unit under test should be subjected to twenty (20) successive static discharges, at
each of the follow voltages: 2KV, 3KV, 4KV, 5KV, 6KV and 8KV.

All power supply outputs shall continue to operate within the parameters of this
specification, without glitches or interruption, while the power is operating as defined and
subjected to 2kV through 10kV ESD pulses. The direct ESD event shall not cause any out of
regulation conditions such as overshoot or undershoot. The power supply shall withstand
these shocks without nuisance trips of the Over-Voltage Protection, Over-Current Protection,
or the remote +5VDC, +12VDC shutdown circuitry.

2.10Radiated Immunity, IEC61000-4-3

Frequency Electric Field Strength

27 MHz to 500 MHz un-modulated 3 V/m

3. DC Output Specification

3.1 Output Current / Loading

The following tables define two power and current rating. The power supply shall
meet both static and dynamic voltage regulation requirements for minimum load
condition.

03

+5V +5VSB+12V -12V+3.3VOutput Voltage
30A 24AMax. Load

Min. Load 0.1A0A2A1A

1A

Table 5 - Load Range 1

Note 1: The +5 & +3.3 Volt total output shall not exceed 180 W.
Note 2: The +5, +3.3 & +12Volt total output shall not exceed 526W.
Note 3: Maximum continues total DC output power shout not exceed 550W.

2A1A41A

ST55GF

3.2 DC Voltage Regulation, Ripple and Noise

The power supply output voltages must stay within the following voltage limits when
operating at steady state and dynamic loading conditions. All outputs are measured with
reference to the return remote sense (ReturnS) signal. The +5V,+12V, -12V and +5BSB
outputs are measure at the power supply connectors references to ReturnS. The +5V and
+3.3V is measured at its remote sense signal (+5VS+, +3.3VS+) located at the signal
connector.

+5V +5VSB+12V -12V+3.3VOutput Voltage

+5%/-5% +5%/-5% +5%/-5% +5%/-5% +10%/-10% Load Reg.

Line Reg.

±

1%

±

1%

±

1%

±

1%

±

1%

Ripple & Noise 50mV 50mV 50mV120mV 120mV

Table 7 - Regulation, ripple and noise

Ripple and noise shall be measured using the following methods:
a) Measurements made differentially to eliminate common-mode noise

b) Ground lead length of oscilloscope probe shall be • 0.25 inch.
c) Measurements made where the cable connectors attach to the load.
d) Outputs bypassed at the point of measurement with a parallel combination of 10uF

tantalum capacitor in parallel with a 0.1uF ceramic capacitors.
e) Oscilloscope bandwidth of 0 Hz to 20MHz.
f) Measurements measured at locations where remote sense wires are connected.
g) Regulation tolerance shall include temperature change, warm up drift and dynamic load

3.3 Dynamic Loading

The output voltages shall remain within the limits specified in Table 7 for the step loading
and within the limits specified in Table 8 for the capacitive loading. The load transient
repetition rate shall be tested between 50Hz and 5kHz at duty cycle ranging from 10%-90%.
The load transient repetition rate is only a test specification. TheΔstep load may occur
anywhere within the MIN load to the MAX load shown in Table 5 and Table 6.

Output

+5V

+3.3V

+12V

+5VSB

ep Load Size

Δ

30% of Max.

30% of Max.
30% of Max.
30% of Max.

Load Slew Rate
Load 0.5 A/uS

Load 0.5 A/uS
Load 0.5 A/uS

Load 0.5 A/uS

Table 8 - Transient Load requirements

Capacitive Load

1000 uF
1000 uF
2200 uF

100uF

04