Table 48. Ripple And Noise - Intel SC5650HCBRP Product Specification

Intel® Server System SC5650HCBRP TPS
4.2.2.7 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.
4.2.2.8 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.
4.2.2.9 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.
50mVp-p
Note: Refer to the Power Supply specification for the equivalent data on +12V and +5VSB
output.
4.2.2.10 Fan Operation in Standby Mode
The fans on the power distribution board continue to operate at their lowest speed (5V) when in
standby mode.
4.2.2.11 Timing Requirements
The timing requirements for the power supply/PDB combination are as follows. The output
voltages must rise from 10% to within regulation limits (T
5VSB, which is allowed to rise from 1.0 to 25 ms. The +3.3V, +5V, and +12V output voltages
start to rise at approximately the same time. All outputs rise monotonically. The +5V output is
greater than the +3.3V output during any point of the voltage rise. The +5V output is never
greater than the +3.3V output by more than 2.25V. Each output voltage reaches regulation
within 50ms (T ) of each other during turn on of the power supply. Each output voltage falls
vout_on
out of regulation within 400 msec (T
shows the timing requirements for the power supply being turned on and off via the AC input,
with PSON held low and the PSON signal, with the AC input applied.
Revision 1.2

Table 48. Ripple and Noise

+3.3V Output
50mVp-p
) of each other during turn off. The following figure
vout_off
Intel order number E81443-002
+5V Output
120mVp-p
) within 5 to 70 ms, except for
vout_rise
Power Sub-system
-12V Output
85