Intel® Server Board S1200SP Family Technical Product Specification
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12.1.11
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.
12.1.12
Hot Swap Requirements
Hot swapping a power supply is the process of inserting and extracting a power supply from an operating
power system. During this process the output voltages shall remain within the limits with the capacitive load
specified. The hot swap test must be conducted when the system is operating under static, dynamic, and zero
loading conditions. The power supply shall use a latching mechanism to prevent insertion and extraction of
the power supply when the AC power cord is inserted into the power supply.
12.1.13
Forced Load Sharing
The +12V output will have active load sharing. The output will share within 10% at full load. The failure of a
power supply should not affect the load sharing or output voltages of the other supplies still operating. The
supplies must be able to load share in parallel and operate in a hot-swap / redundant 1+1 configurations. The
12VSBoutput is not required to actively share current between power supplies (passive sharing). The
12VSBoutput of the power supplies are connected together in the system so that a failure or hot swap of a
redundant power supply does not cause these outputs to go out of regulation in the system.
12.1.14
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 10
F tantalum capacitor in
parallel with a 0.1
F ceramic capacitor is placed at the point of measurement.
Table 58. Ripples and Noise
+12V main
+12VSB
120mVp-p
120mVp-p
The test set-up shall be as 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 27. Differential Noise Test Setup
Summary of Contents for S1200SPL
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