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Intel ATX Power Supply Design Guide
Version 0.9
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
Table 2: AC Line Voltage Transient Limits
Duration | Sag / | Operating AC Voltage | Line | Performance Criteria |
| Surge |
| Frequency |
|
|
|
|
|
|
0 to 500 ms | 10% | Rated AC voltages | 50/60 Hz | No loss of function or |
|
|
|
| performance |
|
|
|
|
|
0 to 15 | 15% | 50/60 Hz | No loss of function or | |
minutes |
| voltages |
| performance |
|
|
|
|
|
0 to ½ AC | 30% | 50/60 Hz | No loss of function or | |
cycle |
| voltages |
| performance |
|
|
|
|
|
0 to 5 AC | 50% | 50/60 Hz | Loss of function acceptable, | |
cycles | sag only | voltages |
| self- recoverable |
|
|
|
|
|
3.1.4.2 Surge Voltages
Input Surge Withstand Capability (Line Transients). The power supply shall meet the
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
3.1.4.2.2 Electrical Fast Transient / Burst, IEC801-4/IEC1000-4-4
No unsafe operation is allowed under any condition. No
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