Intel ATX 3.0, Design Manual

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Electrical
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4.2.9 Voltage Hold-Up Time - REQUIRED
The power supply shall maintain output regulations per Table 4-2 despite a loss of
input power at the low-end nominal range-115 VAC / 47 Hz or 230 VAC / 47 Hz – at
maximum continuous output load as applicable for a minimum of 17ms (T5+T6).
4.2.10 12V2 DC Minimum Loading - REQUIRED
The power 12 V2DC shall maintain output regulations per Table 4-2 and meet
minimum current values below.
Table 4-8: 12V2 DC Minimum Current
Output Minimum current (A)
+12V2 DC 0A (Required)
+12V1 DC 0A (recommended)
4.3 Timing, Housekeeping and Control – REQUIRED
Figure 4-3: Power on Timing