Technical Product Specification
Intel® Server Board S2600IP and Intel® Workstation Board W2600CR TPS Appendix A: Integration and Usage Tips
Revision 1.4 Intel order number G34153-004 119
The residual voltage at the power supply outputs for no load condition shall not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
9.4.10 Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz. The measurement shall be made across a 100Ω resistor between each
of DC outputs, including ground at the DC power connector and chassis ground (power
subsystem enclosure). The test set-up shall use a FET probe such as Tektronix model P6046 or
equivalent.
9.4.11 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.
9.4.12 Zero Load Stability Requirements
When the power subsystem operates in a no load condition, it does not need to meet the output
regulation specification, but it must operate without any tripping of over-voltage or other fault
circuitry. When the power subsystem is subsequently loaded, it must begin to regulate and
source current without fault.
9.4.13 Ripple/Noise
The maximum allowed ripple/noise output of the power supply is defined in the table below. This
is measured over a bandwidth of 10Hz to 20MHz at the power supply output connectors. A
10F tantalum capacitor in parallel with a 0.1F ceramic capacitor is placed at the point of
measurement.
Table 69. Ripples and Noise
+3.3V
+5V
+12V1,2,3
-12V
+5VSB
50mVp-p
50mVp-p
120mVp-p
200mVp-p
50mVp-p
The test set-up is shown below.
AC HOT
POWER SUPPLY
AC NEUTRAL
V
OUT
RETURN
V
AC GROUND
LOAD
SCOPE
LOAD MUST BE
ISOLATED FROM
THE GROUND OF
THE POWER
SUPPLY
10uF
.1uF
GENERAL NOTES:
1. LOAD THE OUTPUT WITH ITS MINIMUM
LOAD CURRENT.
2. CONNECT THE PROBES AS SHOWN.
3. REPEAT THE MEASUREMENTS WITH THE
MAXIMUM LOAD ON THE OUTPUT.
SCOPE NOTE:
USE A TEKTRONIX 7834 OSCILLOSCOPE WITH 7A13 AND
DIFFERENTIAL PROBE P6055 OR EQUIVALENT.
Figure 35. Differential Noise test setup
Note:
When performing this test, the probe clips and capacitors should be located close to the load.