Intel S1200BT Technical Product Specification - Page 136

Grounding, Standby Outputs, Remote Sense, Voltage Regulation, Dynamic Loading

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Design and Environmental Specifications Intel® Server Board S1200BT TPS 10.3.1 Grounding The grounds of the power supply output connector pins provide the power return path. The output connector ground pins are connected to the safety ground (power supply enclosure). This grounding is designed to ensure passing the maximum allowed common mode noise levels. The power supply is provided with a reliable protective earth ground. All secondary circuits are connected to protective earth ground. Resistance of the ground returns to chassis does not exceed 1.0 m. This path may be used to carry DC current. 10.3.2 Standby Outputs The 5 VSB output is present when an AC input greater than the power supply turn on voltage is applied. 10.3.3 Remote Sense The power supply has remote sense return (ReturnS) to regulate out ground drops for all output voltages: +3.3 V, +5 V, +12 V, -12 V, and 5 VSB. The power supply uses remote sense to regulate out drops in the system for the +3.3 V, +5 V, and 12 V outputs. The power supply must operate within specification over the full range of voltage drops from the power supply's output connector to the remote sense points. 10.3.4 Voltage Regulation The power supply output voltages must 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). Table 49. Voltage Regulation Limits Parameter + 3.3 V + 5 V + 12 V - 12 V + 5 VSB Tolerance - 5% / +5% - 5% / +5% - 5% / +5% - 10% / +10% - 5% / +5% Minimum +3.14 +4.75 +11.40 -13.20 +4.75 Normal +3.30 +5.00 +12.00 -12.00 +5.00 Maximum +3.46 +5.25 +12.60 -10.80 +5.25 Units Vrms Vrms Vrms Vrms Vrms 10.3.5 Dynamic Loading The output voltages remain within limits for the step loading and capacitive loading specified in the following table. The load transient repetition rate is tested between 50 Hz and 5 kHz at duty cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The step load may occur anywhere within the Min load to the Max load conditions. Output +3.3 V +5 V 12 V 124 Table 50. Transient Load Requirements ∆ Step Load Size (See note 2) 5.0 A 6.0 A 11.0 A Load Slew Rate 0.25 A/µsec 0.25 A/µsec 0.25 A/µsec Test capacitive Load 250 µF 400 µF 500 µF Intel order number G13326-004 Revision 2.0

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Design and Environmental Specifications
Intel®
Server Board S1200BT TPS
Revision 2.0
Intel order number G13326-004
124
10.3.1
Grounding
The grounds of the power supply output connector pins provide the power return path. The
output connector ground pins are connected to the safety ground (power supply enclosure).
This grounding is designed to ensure passing the maximum allowed common mode
noise levels.
The power supply is provided with a reliable protective earth ground. All secondary circuits are
connected to protective earth ground. Resistance of the ground returns to chassis does not
exceed 1.0 m. This path may be used to carry DC current.
10.3.2
Standby Outputs
The 5 VSB output is present when an AC input greater than the power supply turn on voltage
is applied.
10.3.3
Remote Sense
The power supply has remote sense return (ReturnS) to regulate out ground drops for all output
voltages: +3.3 V, +5 V, +12 V, -12 V, and 5 VSB. The power supply uses remote sense to
regulate out drops in the system for the +3.3 V, +5 V, and 12 V outputs. The power supply must
operate within specification over the full range of voltage drops from the power supply’s output
connector to the remote sense points.
10.3.4
Voltage Regulation
The power supply output voltages must 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).
Table 49. Voltage Regulation Limits
Parameter
Tolerance
Minimum
Normal
Maximum
Units
+ 3.3 V
- 5% / +5%
+3.14
+3.30
+3.46
Vrms
+ 5 V
- 5% / +5%
+4.75
+5.00
+5.25
Vrms
+ 12 V
- 5% / +5%
+11.40
+12.00
+12.60
Vrms
- 12 V
- 10% / +10%
-13.20
-12.00
-10.80
Vrms
+ 5 VSB
- 5% / +5%
+4.75
+5.00
+5.25
Vrms
10.3.5
Dynamic Loading
The output voltages remain within limits for the step loading and capacitive loading specified in
the following table. The load transient repetition rate is tested between 50 Hz and 5 kHz at duty
cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The
step load may occur anywhere within the Min load to the Max load conditions.
Table 50. Transient Load Requirements
Output
∆
Step Load Size
(See note 2)
Load Slew Rate
Test capacitive Load
+3.3 V
5.0 A
0.25 A/μsec
250 μF
+5 V
6.0 A
0.25 A/μsec
400 μF
12 V
11.0 A
0.25 A/μsec
500 μF