Capacitive Loading; Closed Loop Stability; Common Mode Noise; Ripple / Noise - Intel SE7520JR2 Technical Manual

Design and Environmental Specifications
8.2.7

Capacitive Loading

The power supply shall be stable and meet all requirements with the following capacitive
loading ranges.
+3.3V
+5V
+12V(1, 2, 3)
-12V
+5VSB
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.
50mVp-p
208

Table 120: Capacitve Loading Conditions

Output MIN
250
400
500 each
1
20

Table 121: Ripple and Noise

+3.3V +5V
50mVp-p 120mVp-p
C78844-002
MAX
6,800
4,700
11,000
350
350
+12V1/2 -12V
120mVp-p
Intel® Server Board SE7520JR2
Units
µF
µF
µF
µF
µF
+5VSB
50mVp-p
Revision 1.0