Technical Product Specification
Power and Environmental Specifications Intel
®
Server Board S5500BC TPS
Intel order number: E42249-009 Revision 1.8
110
with local sensing through the submission of bode plots. Closed-loop stability must be
maintained at the maximum and minimum loads as applicable.
9.2.11 Common Mode Noise
The common mode noise on any output should not exceed 350 mV peak-peak over the
frequency band of 10 Hz to 30 MHz.
The measurement should
outputs, including ground, at the DC power connector and chassis ground (power
subsystem enclosure).
The test set-up should use an FET probe such as a Tektronix P6046* model or
equivalent.
9.2.12 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 0 Hz to 20 MHz at the power supply output connectors. A
10 F tantalum capacitor in parallel with a 0.1 F ceramic capacitor are placed at the point of
measurement.
Table 70. Ripple and Noise
+3.3 V
+5 V
+12 V1,2
-12 V
+5 VSB
50mVp-p
50mVp-p
120mVp-p
120mVp-p
50mVp-p
9.2.13 Soft Starting
The Power Supply shall contain control circuit which provides monotonic soft start for its outputs
without overstress of the AC line or any power supply components at any specified AC line or
load conditions. The rise time of 5Vsb shall be from 1.0ms to 25ms and the turn on/off shall be
monotonic.
9.2.14 Timing Requirements
These are the timing requirements for the power supply operation. The output voltages must
rise from 10% to within regulation limits (Tvout_rise) within 5 to 70ms, except for 5VSB - it is
allowed to rise from 1.0 to 25ms. The +3.3V, +5V and +12V output voltages should start to rise
approximately at the same time. All outputs must rise monotonically. The +5V output needs to
be greater than the +3.3V output during any point of the voltage rise. The +5V output must
never be greater than the +3.3V output by more than 2.25V. Each output voltage shall reach
regulation within 50ms (Tvout_on) of each other during turn on of the power supply. Each output
voltage shall fall out of regulation within 400msec (Tvout_off) of each other during turn off.
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.