Electrical
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Figure 4-1: Differential Noise Test Setup
4.2.6 Capacitive Load (Recommended)
The power supply should be able to power up and operate within the regulation limits
defined in Table 4-2
, with the following capacitances simultaneously present on the DC
outputs. These Capacitive Loads are to simulate what a motherboard / system
provides when connected to a power supply.
Table 4-7: Output Capacitive Loads
Output Capacitive Load (μF)
+12V1DC 3,300
+12V2DC 3,300
+12VSB 3,300
4.2.7 Closed Loop Stability (Required)
The power supply shall be unconditionally stable under all line/load/transient load
conditions including capacitive loads specified in Section 4.2.6
. A minimum of 45
degrees phase margin and 10 dB gain margin is recommended at both the maximum
and minimum loads.
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