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Intel ATX Power Supply Design Guide
Version 0.9
Page 9
3.1.4 Immunity
3.1.4.1 Slow Transients
The DC output(s) shall not exceed the limits specified in Section 3.2.1 as a result of the
input power line noise defined in Table 2 under any load condition per EN 61000-4-11.
Table 2: AC Line Voltage Transient Limits
Duration Sag /
Surge
Operating AC Voltage Line
Frequency
Performance Criteria
0 to 500 ms 10% Rated AC voltages 50/60 Hz No loss of function or
performance
0 to 15
minutes
15% Mid-point of rated AC
voltages
50/60 Hz No loss of function or
performance
0 to ½ AC
cycle
30% Mid-point of rated AC
voltages
50/60 Hz No loss of function or
performance
0 to 5 AC
cycles
50%
sag only
Mid-point of rated AC
voltages
50/60 Hz Loss of function acceptable,
self- recoverable
3.1.4.2 Surge Voltages
Input Surge Withstand Capability (Line Transients). The power supply shall meet the
IEC801-5/IEC 1000-4-5 Level 1, Level 2, and Level 3 criteria for surge withstand
capability, with the following conditions and exceptions. The power supply must meet the
surge withstand test for the range of operation specified in Section 3.1.
The peak value of the injected unipolar wave form shall be 2.0 kV measured at the input of
the power supply for the common and the normal modes of transient surge injection.
The surge withstand test must not produce:
• Damage to the power supply
• Disruption of the normal operation of the power supply
• Output voltage deviation exceeding the limits of Section 3.2.1.
3.1.4.2.1 Surge Immunity, IEC801-5/IEC1000-4-5
No unsafe operation is allowed under any condition. No user-noticeable performance
degradation for 1 kV Differential Mode (DM) or 2 kV Common Mode (CM) is allowed.
Automatic or manual recovery is allowed for other conditions.
3.1.4.2.2 Electrical Fast Transient / Burst, IEC801-4/IEC1000-4-4
No unsafe operation is allowed under any condition. No user-noticeable performance
degradation up to 1 kV is allowed. Automatic or manual recovery is allowed for other
conditions.