Intel ATX - Voltage Hold-Up and Minimum Loading

Electrical
Design Guide 19
Figure 3-2: Power Supply Timing
3.2.9 Voltage Hold-Up Time - Required
The power supply shall maintain output regulations per Table 3-2 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).
3.2.10 12V2 DC Minimum Loading - Required
The power supply +12 V2DC shall maintain output regulations per Table 3-2 and meet
minimum current values below.
Table 3-7: 12V2 DC Minimum Current
Output Minimum Current (A)
+12V2 DC 0A (Required)
+12V1 DC 0 (Recommended)