Technical Product Specification

System Power Sub-system Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS
Revision 1.2 Intel order number G38159-002
73
2.4.2.9 DC/DC Converters Voltage Regulation
The DC/DC converters’ output voltages stay within the following voltage limits when operating
at steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise
specified in Table 95. The 3.3V and 5V outputs are measured at the remote sense point, all
other voltages measured at the output harness connectors.
Table 85. Voltage Regulation Limits
Converter output
Tolerance
Min
Nom
Max
Units
+ 3.3VDC
-4%/+5%
+3.20
+3.30
+3.46
VDC
+ 5VDC
-4%/+5%
+4.80
+5.00
+5.25
VDC
5Vstby
-4%/+5%
+4.80
+5.00
+5.25
VDC
2.4.2.10 DC/DC Converters Dynamic Loading
The output voltages remains within limits specified in table above for the step loading and
capacitive loading specified in Table 93 below. The load transient repetition rate is only a test
specification. The  step load may occur anywhere within the MIN load to the MAX load shown
in Tables 93 and 94.
Table 86. Transient Load Requirements
Output
Max  Step Load Size
Max Load Slew Rate
Test capacitive Load
+ 3.3VDC
5A
0.25 A/s
250 F
+ 5VDC
5A
0.25 A/s
400 F
+5Vsb
0.5A
0.25A/s
20 F
2.4.2.11 DC/DC Converter Capacitive Loading
The DC/DC converters is stable and meet all requirements with the following capacitive loading
ranges.Minimum capacitive loading applies to static load only.
Table 87. Capacitive Loading Conditions
Converter output
Min
Max
Units
+3.3VDC
250
6800
F
+5VDC
400
4700
F
5Vstby
20
350
F
2.4.2.12 DC/DC Converters Closed Loop stability
Each DC/DC converter is unconditionally stable under all line/load/transient load conditions
including capacitive load ranges specified in Section 2.4.2.11. A minimum of: 45 degrees
phase margin and -10dB-gain margin is required. The PDB provides proof of the unit’s
closed-loop stability with local sensing through the submission of Bode plots. Closed-loop
stability must be ensured at the maximum and minimum loads as applicable.