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Design and Environmental Specifications Intel® Server Board SE7520JR2
Revision 1.0
C78844-002
208
8.2.7 Capacitive Loading
The power supply shall be stable and meet all requirements with the following capacitive
loading ranges.
Table 120: Capacitve Loading Conditions
Output MIN MAX Units
+3.3V
250
6,800
µF
+5V
400
4,700
µF
+12V(1, 2, 3)
500 each
11,000
µF
-12V
1
350
µF
+5VSB
20
350
µF
8.2.8 Closed Loop Stability
The power supply shall be unconditionally stable under all line/load/transient load conditions
including capacitive load ranges. A minimum of: 45 degrees phase margin and -10dB-gain
margin is required. Closed-loop stability must be ensured at the maximum and minimum loads
as applicable.
8.2.9 Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency
band of 10Hz to 30MHz.
8.2.10 Ripple / Noise
The maximum allowed ripple/noise output of the power supply is defined in the following table.
This is measured over a bandwidth of 0Hz to 20MHz at the power supply output connectors.
Table 121: Ripple and Noise
+3.3V +5V +12V1/2 -12V +5VSB
50mVp-p 50mVp-p 120mVp-p 120mVp-p 50mVp-p