Power Sub-system Intel
®
Entry Server Chassis SC5299-E TPS
Revision 3.1
Intel order number D37594-005
70
2.4.2.13 DC/DC Converters Loading
The following table defines the power and current ratings for the three DC/DC converters
located on the cage; each is powered from a +12V5 rail. The three converters meet both static
and dynamic voltage regulation requirements for the minimum and maximum loading conditions.
Note: 3.3V/5V combined power limit: 170 W max.
Table 84. DC/DC Converter Load Ratings
+12VDC Input DC/DC Converters
+3.3V Converter +5V Converter -12V Converter
MAX Load 24.0A 30.0A 0.3A
MIN Static/Dynamic Load 0A 0A 0A
Max Output Power, see note 1 3.3x24=79.2W 5x30=150W 0.3x12=4.8W
Notes:
1. Maximum continuous total DC output power should not exceed 610 W..
2. Peak power and current loading shall be supported for a minimum of 12 seconds.
3. Combined 3.3V and 5V power shall not exceed 170 W.
2.4.2.14 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.
All outputs are measured with reference to the return remote sense signal (ReturnS). The 3.3V
and 5V outputs are measured at the remote sense point; all other voltages are measured at the
output harness connectors.
Table 85. Voltage Regulation Limits
Converter Output Tolerance MIN NOM MAX UNITS
+ 3.3VDC - 5%/+5% +3.14 +3.30 +3.46 V
rms
+ 5VDC - 5%/+5% +4.75 +5.00 +5.25 V
rms
+ 12VDC
(12V1/2/3/4)
- 5%/+5% +11.40 +12.00 +12.60 V
rms
- 12VDC - 10%/+10% -10.80 -12.00 -13.20 V
rms
+ 5VSB See Power Supply Specification; measured at the power distribution board
harness connectors.
2.4.3 DC/DC Converters Dynamic Loading
The output voltages remain within limits specified for step loading and capacitive loading, as
specified in the following table. The load transient repetition rate is tested between 50 Hz and 5
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