SilverStone ST55GF Manual - Manual (Page 3)

ST55GF
2.3 Input Power Factor Correction (Active PFC)
The power factor at full load shall be • •0.95 at nominal input voltage.
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.
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