Technical Product Specification

Intel® Server Chassis SC5650 TPS Power Sub-system
Revision 1.2
Intel order number E39531-004
57
2.3.2.6 DC / DC Converter Capacitive Loading
All outputs of the DC / DC converter are stable and meet all requirements with the following
capacitive loading ranges.
Table 59. Capacitive Loading Conditions
Converter Output MIN MAX Units
+3.3VDC 250 6,800 μF
+5VDC 400 4,700 μF
-12VDC 1 350 μF
Note: Refer to the Power Supply specification for the equivalent data on +12V and +5VSB
output.
2.3.2.7 DC/DC Converters Closed Loop Stability
Each DC/DC converter is 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.
2.3.2.8 Common Mode Noise
The Common Mode Noise on any output does not exceed 350 mV peak-peak over the
frequency band of 10 Hz to 30 MHz.
2.3.2.9 DC/DC Converters Ripple/Noise
The maximum allowed ripple/noise output of each DC/DC Converter is defined in the following
table. This is measured over a bandwidth of 0Hz to 20MHz at the PDB output connectors. A
10μF tantalum capacitor in parallel with a 0.1μF ceramic capacitor is placed at the point of
measurement.
Table 60. Ripple and Noise
+3.3V Output +5V Output -12V Output
50mVp-p 50mVp-p 120mVp-p
Note: Refer to the Power Supply specification for the equivalent data on +12V and +5VSB output.
2.3.2.10 Fan Operation in Standby Mode
The fans on the power distribution board continue to operate at their lowest speed (5V) when in
standby mode.