Intel Power Supply EPS1U User Manual

SSI  
EPS1U Power Supply Design Guide, V1.1  
EPS1U  
Power Supply Design Guide  
A Server System Infrastructure (SSI) Specification  
For 1U Rack Chassis Power Supplies  
Version 1.1  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
Contents  
1
2
3
4
Purpose ..........................................................................................................................................................5  
Conceptual Overview....................................................................................................................................5  
Definitions/Terms/Acronyms .......................................................................................................................6  
Mechanical Overview....................................................................................................................................7  
4.1  
4.2  
4.3  
4.4  
High Power Card Edge Form Factor...................................................................................................7  
Alternate Enclosure.............................................................................................................................8  
Airflow Requirements ..........................................................................................................................9  
Temperature Requirements ................................................................................................................9  
5
AC Input Requirements ..............................................................................................................................10  
5.1  
5.2  
5.3  
5.4  
5.5  
5.6  
5.7  
5.8  
5.9  
AC Inlet Connector ............................................................................................................................10  
AC Input Voltage Specification..........................................................................................................10  
Input Under Voltage ..........................................................................................................................10  
Efficiency...........................................................................................................................................11  
AC Line Dropout................................................................................................................................11  
AC Line Fuse.....................................................................................................................................11  
AC Inrush...........................................................................................................................................11  
AC Line Transient Specification........................................................................................................12  
AC Line Fast Transient Specification................................................................................................12  
6
DC Output Specification.............................................................................................................................13  
6.1  
6.2  
6.3  
6.4  
Connector..........................................................................................................................................13  
Grounding..........................................................................................................................................15  
Remote Sense...................................................................................................................................15  
Output Power/Currents......................................................................................................................15  
6.4.1 Standby Outputs ...................................................................................................................17  
Voltage Regulation............................................................................................................................18  
Dynamic Loading...............................................................................................................................18  
Capacitive Loading............................................................................................................................19  
Ripple / Noise....................................................................................................................................19  
Timing Requirements ........................................................................................................................20  
6.5  
6.6  
6.7  
6.8  
6.9  
7
8
Protection Circuits ......................................................................................................................................23  
7.1  
7.2  
7.3  
7.4  
Current Limit......................................................................................................................................23  
240VA Protection ..............................................................................................................................23  
Over Voltage Protection ....................................................................................................................24  
Over Temperature Protection............................................................................................................24  
Control and Indicator Functions................................................................................................................25  
8.1  
8.2  
8.3  
8.4  
PSON# ...............................................................................................................................................25  
PWOK (Power OK)............................................................................................................................26  
ACWarning ........................................................................................................................................27  
Field Replacement Unit (FRU) Signals .............................................................................................28  
8.4.1 FRU Data ..............................................................................................................................28  
8.4.2 FRU Data Format..................................................................................................................28  
LED Indicator.....................................................................................................................................30  
8.5  
 
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EPS1U Power Supply Design Guide, V1.1  
9
MTBF.............................................................................................................................................................30  
10 Agency Requirements ................................................................................................................................31  
Figures  
Figure 1: Enclosure Drawing.....................................................................................................................................7  
Figure 2: Alternate Enclosure Drawing .....................................................................................................................8  
Figure 3: Edge Finger Layout..................................................................................................................................14  
Figure 4: Output Voltage Timing .............................................................................................................................20  
Figure 5: Turn On/Off Timing (Signal Power Supply) .............................................................................................22  
Figure 6: PSON# Signal Characteristics.................................................................................................................25  
Tables  
Table 1: Definitions, Terms, and Acronyms (listed alphabetically) ...........................................................................6  
Table 2: Thermal Requirements................................................................................................................................9  
Table 3: AC Input Rating.........................................................................................................................................10  
Table 4: AC Line Sag Transient Performance........................................................................................................12  
Table 5: AC Line Surge Transient Performance.....................................................................................................12  
Table 6: Edge Finger Pinout ...................................................................................................................................13  
Table 7: 125 W Load Ratings..................................................................................................................................16  
Table 8: 250 W Load Ratings..................................................................................................................................16  
Table 9: 350 W Load Ratings..................................................................................................................................17  
Table 10: Voltage Regulation Limits .......................................................................................................................18  
Table 11: Optional +5V Regulation Limits ..............................................................................................................18  
Table 12: Transient Load Requirements.................................................................................................................18  
Table 13: Capacitve Loading Conditions ................................................................................................................19  
Table 14: Ripple and Noise.....................................................................................................................................19  
Table 15: Output Voltage Timing ............................................................................................................................20  
Table 16: Turn On/Off Timing .................................................................................................................................21  
Table 17: Over Current Protection ..........................................................................................................................23  
Table 18: Over Current Protection ..........................................................................................................................23  
Table 19: Over Voltage Limits.................................................................................................................................24  
Table 20: PSON# Signal Characteristic...................................................................................................................25  
Table 21: PWOK Signal Characteristics .................................................................................................................26  
Table 22: ACWarning Signal Characteristics..........................................................................................................27  
Table 23: FRU Device Information..........................................................................................................................28  
Table 24: FRU Device Product Information Area....................................................................................................28  
Table 25: FRU Device MultiRecord Area................................................................................................................29  
Table 26: LED Indicators.........................................................................................................................................30  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
1 Purpose  
This specification defines a non-redundant power supply that supports 1U rack mount entry server systems. The  
entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are  
defined in this specification for open industry use. This specification defines a 125W, 250 W and 350 W power  
supply with six outputs; 3.3 V, 5 V, 12 V, -12 V, and 5 VSB. The form factor fits into a 1U system and provides a  
wire harness or docking solution for output connections. An IEC connector is provided on the external face for AC  
input to the power supply. The power supply contains fans for cooling, while meeting acoustic requirements.  
2 Conceptual Overview  
In the Entry server market, the bulk power system must source power on several output rails.  
These rails are typically as follows:  
·
·
·
·
·
+3.3 V  
+5 V  
+12 V  
–12 V  
5V standby  
NOTE  
Local DC-DC converters shall be utilized for processor power, and will ideally convert power from the +12 V  
rail, however, they may also convert power from other rails.  
The bulk power system may be an n+1 redundant power system or a non-redundant power system.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
3 Definitions/Terms/Acronyms  
Table 1: Definitions, Terms, and Acronyms (listed alphabetically)  
Required  
The status given to items within this design guide, which are required to  
meet SSI guidelines and a large majority of system applications.  
Recommended  
Optional  
The status given to items within this design guide which are not required to  
meet SSI guidelines, however, are required by many system applications.  
The status given to items within this design guide, which are not required to  
meet SSI guidelines, however, some system applications may optionally  
use these features.  
Full Ranging  
A full-ranging power supply automatically senses and adjusts itself to the  
proper input voltage range (110 VAC or 220 VAC). No manual switches or  
manual adjustments are needed.  
CFM  
Cubic Feet per Minute (airflow).  
Dropout  
A condition that allows the line voltage input to the power supply to drop to  
below the minimum operating voltage.  
Latch Off  
A power supply, after detecting a fault condition, shuts itself off. Even if the  
fault condition disappears the supply does not restart unless manual or  
electronic intervention occurs. Manual intervention commonly includes  
briefly removing and then reconnecting the supply, or it could be done  
through a switch. Electronic intervention could be done by electronic  
signals in the Server System.  
Monotonically  
A waveform changes from one level to another in a steady fashion, without  
intermediate retracement or oscillation.  
MTBF  
Mean time between failure  
Noise  
The periodic or random signals over frequency band of 0 Hz to 20 MHz.  
Overcurrent  
A condition in which a supply attempts to provide more output current than  
the amount for which it is rated. This commonly occurs if there is a "short  
circuit" condition in the load attached to the supply.  
PFC  
Power Factor Corrected.  
PWOK  
A typical logic level output signal provided by the supply that signals the  
Server System that all DC output voltages are within their specified range.  
The periodic or random signals over a frequency band of 0 Hz to 20 MHz.  
Ripple  
Rise Time  
Rise time is defined as the time it takes any output voltage to rise from  
10% to 95% of its nominal voltage.  
Sag  
The condition where the AC line voltage drops below the nominal voltage  
conditions.  
Surge  
The condition where the AC line voltage rises above nominal voltage.  
VSB or Standby Voltage  
An output voltage that is present whenever AC power is applied to the AC  
inputs of the supply.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
4 Mechanical Overview  
There are two physical sizes of the power supply enclosure intended to accommodate power levels of 125W,  
250W and 350W. There are two output connector designs. A card edge solution to provide ease of installation  
and removal and a wire harness to provide a traditional cabled solution. The chassis for the entry 1U power  
supply is designed for use in 1U rack mounted systems.  
4.1 High Power Card Edge Form Factor  
STATUS  
Large Power Form  
Factor  
The high power edge card form factor is intended for use at 250W and 350W power levels. Refer to Figure 1 for  
details. The supply will provide its output power via a card edge on the interior face of the power supply to  
provide users and manufacturers easy installation and removal of the power supply into the system.  
Top View  
IEC Connector  
53.0 +/- 0.2  
80.92 +0/-0.05  
106.0 +/- 0.2  
12.54 +/-0.3  
IEC Connector  
Center Line  
Bi-Color LED  
(PWR/Fail)  
8.5 +/-0.3  
IEC Connector  
Center Line  
300.0 +/-0.2  
5.0 +/-0.3  
0.0 +0.2/-0.5  
Fan  
AC I/P  
Fan  
62  
1
32  
31  
Side View  
Interior Face View  
Exterior Face View  
16.4 +/- 0.2  
All dimensions are in millimeters.  
Figure 1: Enclosure Drawing  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
4.2 Alternate Enclosure  
STATUS  
Small Power Form Factor  
Systems may require a smaller power supply enclosure. Figure 2 details a smaller power supply enclosure for  
such systems. This form factor accommodates power levels of 250W and 125W. The supply will provide output  
power via a wire harness out the interior face of the supply. Refer to the Entry Electronics Bay Specification at  
the SSI web site (http://www.ssiforum.org/docs/entry_elecbay_spec_v2_0.pdf) for possible output connector  
configurations. Due to different system board layouts the wire harness length may vary.  
IEC Connector  
53.0 +/- 0.2  
106.0 +/- 0.2  
IEC Connector  
Center Line  
Bi-Color LED  
(PWR/Fail)  
IEC Connector  
Center Line  
215.0 +/-0.2  
40.0 +0.2/-0.5  
Fan  
AC I/P  
Fan  
Interior Face  
Exterior Face  
16.4 +/- 0.2  
All dimensions are in millimeters.  
Figure 2: Alternate Enclosure Drawing  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
4.3 Airflow Requirements  
STATUS  
Recommended  
The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During  
low-speed fan operation, the power supply shall not exceed a noise level of 38 dBA measured at one meter on all  
faces. At low fan speed, the power supply shall provide a minimum of 6 CFM of airflow with 0.003 inH2O of  
system backpressure. At high fan speed, the power supply shall provide a minimum of 10 CFM with 0.006 inH2O  
of system backpressure.  
4.4 Temperature Requirements  
STATUS  
Recommended  
The power supply shall operate within all specified limits over the Top temperature range. The average air  
temperature difference (DTps ) from the inlet to the outlet of the power supply shall not exceed the values shown in  
Table 2. All airflow shall pass through the power supply and not over the exterior surfaces of the power supply.  
Table 2: Thermal Requirements  
Item  
Description  
MIN  
MAX  
Units  
Top  
Operating temperature range.  
0
45  
°C  
Temperature rise from inlet air to outlet air of power supply.  
125 W output power, 10 CFM, Sea level, 25 °C inlet air.  
125 W output power, 6 CFM, Sea level, 25 °C inlet air.  
Temperature rise from inlet air to outlet air of power supply.  
250 W output power, 10 CFM, Sea level, 25 °C inlet air.  
250 W output power, 6 CFM, Sea level, 25 °C inlet air.  
350 W output power, 10 CFM, Sea level, 25 °C inlet air.  
350 W output power, 6 CFM, Sea level, 25 °C inlet air.  
Non-operating temperature range.  
DTps  
15  
25  
°C  
°C  
20  
30  
°C  
°C  
°C  
°C  
°C  
30  
40  
Tnon-op  
-40  
70  
The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power  
supply, with exception to the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short  
periods of time only”.  
 
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EPS1U Power Supply Design Guide, V1.1  
5 AC Input Requirements  
STATUS  
Required  
The power supply shall incorporate universal power input with active power factor correction, which shall reduce  
line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards.  
5.1 AC Inlet Connector  
STATUS  
Required  
The AC input connector shall be an IEC 320 C-14 power inlet. This inlet is rated for 15 A / 250 VAC.  
5.2 AC Input Voltage Specification  
STATUS  
Required  
The power supply must operate within all specified limits over the following input voltage range. Harmonic  
distortion of up to 10% THD must not cause the power supply to go out of specified limits. The power supply shall  
operate properly at 85 VAC input voltage to guarantee proper design margins.  
Table 3: AC Input Rating  
Parameter  
MIN  
Rated  
MAX  
MAX Input  
Current  
(125W)  
MAX Input  
Current  
(250W)  
MAX Input  
Current  
(350W)  
MAX Rated Input  
Current  
(125W/250W/350W)  
1,3  
1,3  
1,3  
4
Voltage (110) 90 Vrms  
Voltage (220) 180 Vrms  
Frequency  
100-127 Vrms  
200-240 Vrms  
140 Vrms  
264 Vrms  
63 Hz  
2.4 Arms  
4.2 Arms  
5.9 Arms  
2.2 / 3.8 / 5.3Arms  
2,3  
2,3  
2,3  
4
1.2 Arms  
2.1 Arms  
3.0 Arms  
1.1 / 1.9 / 2.7 Arms  
47 Hz  
1. Maximum input current at low input voltage range shall be measured at 90VAC. A 125W output load shall be applied to the  
125W version, a 250 W output load shall be applied for the 250 W version and a 350 W output load shall be applied to the  
350 W version.  
2. Maximum input current at high input voltage range shall be measured at 180 VAC. A 125W output load shall be applied to  
the 125W version, a 250 W output load shall be applied for the 250 W version and a 350 W output load shall be applied to the  
350 W version.  
3. This is not to be used for determining agency input current markings.  
4. Maximum rated input current is measured at 100 VAC and 200 VAC.  
5.3 Input Under Voltage  
STATUS  
Required  
The power supply shall contain protection circuitry such that application of an input voltage below the minimum  
specified in section 5.2 shall not cause damage to the power supply.  
 
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EPS1U Power Supply Design Guide, V1.1  
5.4 Efficiency  
STATUS  
Required  
The power supply shall have a minimum efficiency of 68% at maximum load and over the specified AC voltage.  
There is no efficiency requirement for the 125W version.  
5.5 AC Line Dropout  
STATUS  
Required  
An AC line dropout is defined to be when the AC input drops to 0 VAC at any phase of the AC line for any length  
of time. During an AC dropout of one cycle or less the power supply must meet dynamic voltage regulation  
requirements over the rated load. An AC line dropout of one cycle or less shall not cause any tripping of control  
signals or protection circuits. If the AC dropout lasts longer than one cycle, the power supply should recover and  
meet all turn on requirements. The power supply must meet the AC dropout requirement over rated AC voltages,  
frequencies, and output loading conditions. Any dropout of the AC line shall not cause damage to the power  
supply.  
5.6 AC Line Fuse  
STATUS  
Required  
The power supply shall incorporate one input fuse on the LINE side for input over current protection to prevent  
damage to the power supply and meet product safety requirements. Fuses should be slow blow type or  
equivalent to prevent nuisance trips. AC inrush current shall not cause the AC line fuse to blow under any  
conditions. All protection circuits in the power supply shall not cause the AC fuse to blow unless a component in  
the power supply has failed. This includes DC output load short conditions.  
STATUS  
Optional  
Some system applications may require a second input fuse in the NEUTRAL side of the AC input. In this case  
two fuses would be required; one in the LINE side and one in the NEUTRAL side of the AC inlet to the power  
supply.  
5.7 AC Inrush  
STATUS  
Required  
The power supply must meet inrush requirements for any rated AC voltage, during turn on at any phase of AC  
voltage, during a single cycle AC dropout condition, during repetitive ON/OFF cycling of AC, and over the  
specified temperature range (Top). The peak inrush current shall be less than the ratings of its critical components  
(including input fuse, bulk rectifiers, and surge limiting device).  
 
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EPS1U Power Supply Design Guide, V1.1  
STATUS  
Recommended  
An additional inrush current limit is recommended for some system applications that require multiple systems on a  
single AC circuit. AC line inrush current shall not exceed 30 A peak for one-quarter of the AC cycle, after which,  
the input current should be no more than the specified maximum input current from Table 3.  
5.8 AC Line Transient Specification  
STATUS  
Recommended  
AC line transient conditions shall be defined as “sag” and “surge” conditions. Sag conditions (also referred to as  
“brownout” conditions) will be defined as the AC line voltage dropping below nominal voltage. Surge will be  
defined as the AC line voltage rising above nominal voltage.  
The power supply shall meet the requirements under the following AC line sag and surge conditions.  
Table 4: AC Line Sag Transient Performance  
Duration  
Sag  
10%  
100%  
>10%  
Operating AC Voltage  
Nominal AC Voltage ranges  
Nominal AC Voltage ranges  
Nominal AC Voltage ranges  
Line Frequency Performance Criteria  
Continuous  
0 to 1 AC cycle  
> 1 AC cycle  
50/60 Hz  
50/60 Hz  
50/60 Hz  
No loss of function or performance  
No loss of function or performance  
Loss of function acceptable, self-  
recoverable  
Table 5: AC Line Surge Transient Performance  
Surge Operating AC Voltage Line Frequency Performance Criteria  
Duration  
Continuous  
0 to ½ AC cycle  
10%  
30%  
Nominal AC Voltages  
Mid-point of nominal AC  
Voltages  
50/60 Hz  
50/60 Hz  
No loss of function or performance  
No loss of function or performance  
5.9 AC Line Fast Transient Specification  
STATUS  
Recommended  
The power supply shall meet the EN61000-4-5 directive and any additional requirements in IEC1000-4-5:1995  
and the Level 3 requirements for surge-withstand capability, with the following conditions and exceptions:  
·
These input transients must not cause any out-of-regulation conditions, such as overshoot and  
undershoot, nor must it cause any nuisance trips of any of the power supply protection circuits.  
·
·
The surge-withstand test must not produce damage to the power supply.  
The supply must meet surge-withstand test conditions under maximum and minimum DC-output load  
conditions.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
6 DC Output Specification  
6.1 Connector  
STATUS  
Required  
The power supply uses a blind mating type connector with edge fingers (see Figure 1) to connect the power  
supply’s output voltages and signals to a connector located in the system. The card edge pin assignments are  
listed in Table 6. Figure 3 shows the card edge layout for the power supply. The connector located in the system  
is an AMP 1364999-1 or equivalent.  
Signals that can be defined as low true or high true use the following convention: signal# = low true. Reserved  
pins are reserved for future use.  
Table 6: Edge Finger Pinout  
Description  
-12V  
PWOK  
Pin#  
1
2
3
4
5
6
7
8
Pin#  
62  
61  
60  
59  
58  
57  
56  
55  
54  
53  
52  
Description  
PSON#  
SDA  
Reserved  
ACWarning  
5VSB  
Removed pin  
Reserved  
Reserved  
Reserved  
Reserved  
12V2  
SCL  
PSAlert#  
ReturnS  
Reserved  
Reserved  
3.3VS  
Reserved  
Reserved  
12V2  
9
10  
11  
Keying notch between positions 11 and 12  
12V2  
12V2  
12V1  
12V1  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
51  
50  
49  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
12V2  
12V2  
12V1  
12V1  
12V1  
12V1  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
5V  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
5V  
5V  
5V  
3.3V  
3.3V  
5V  
5V  
3.3V  
3.3V  
3.3V  
3.3V  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
All dimensions are in millimeters.  
Top View of Power Supply  
Keying Notch  
1.6  
7.62 MIN  
21.59 +/-0.05  
62  
1.27 +/-0.05  
1.27  
32  
31  
6.35 +/-0.05  
6.35 +/-0.05  
6.35 +/-0.05  
6.35 +/-0.05  
9 spaces @ 2.54  
29.03 +/-0.05  
1.07 +/-0.05  
0.38 x 45  
51.89 +/-0.05  
1.57 x 45  
1
5.08 MIN  
Bottom view of power supply  
Figure 3: Edge Finger Layout  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
6.2 Grounding  
STATUS  
Required  
The ground of the pins of the power supply wire harness provides the power return path. The wire harness  
ground pins shall be connected to safety ground (power supply enclosure).  
6.3 Remote Sense  
STATUS  
Optional  
The power supply may have remote sense return (ReturnS) to regulate out ground drops for all output voltages;  
+3.3 V, +5 V, +12 V1, +12 V2, -12 V, and 5 VSB. The power supply may use remote sense (3.3VS) to regulate  
out drops in the system for the +3.3 V output. The +5 V, +12 V1, +12 V2, –12 V, and 5 VSB outputs only use  
remote sense referenced to the ReturnS signal. The remote sense input impedance to the power supply must be  
greater than 200 W on 3.3 VS and ReturnS. This is the value of the resistor connecting the remote sense to the  
output voltage internal to the power supply. Remote sense must be able to regulate out a minimum of 200 mV  
drop on the +3.3 V output. The remote sense return (ReturnS) must be able to regulate out a minimum of 200 mV  
drop in the power ground return. The current in any remote sense line shall be less than 5 mA to prevent voltage  
sensing errors. 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.  
6.4 Output Power/Currents  
The following tables define three power and current ratings for a 125W, 250 W and a 350 W power supply. These  
were selected to cover different types of systems and configurations. The 125W power level is targeted for use in  
“today’s” low power server systems. The 250W power level is targeted for use in “today’s” higher power 1U  
server systems. The 350W power level is directed at “tomorrow’s” higher power 1U server systems. The  
combined output power of all outputs shall not exceed the rated output power. The tables show the load ranges  
for each of the two power supply power levels. The power supply must meet both static and dynamic voltage  
regulation requirements for the minimum loading conditions.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
STATUS  
Low Power Recommendation  
Table 7: 125 W Load Ratings  
Load Range  
Voltage  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
-12 V  
Minimum Continuous  
0.5 A  
0.5 A  
0.25 A  
Not used for 125W version.  
0 A  
Maximum Continuous  
6 A  
12 A  
3 A  
Peak  
6 A  
0.2 A  
1.0 A  
+5 VSB  
0.1 A  
1. Maximum continuous total DC output power should not exceed 125 W.  
2. Peak total DC output power should not exceed 161 W.  
3. Peak power and current loading shall be supported for a minimum of 12 seconds.  
STATUS  
Medium Power Recommendation  
Table 8: 250 W Load Ratings  
Load Range 1  
Voltage  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
-12 V  
Minimum Continuous  
Maximum Continuous  
Peak  
1.5 A  
1.0 A  
1.5 A  
0.5 A  
0 A  
16 A  
12 A  
16 A  
10 A  
0.5 A  
See note 2  
See note 2  
+5 VSB  
0.1 A  
2.0 A  
Load Range 2  
Voltage  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
-12 V  
Minimum Continuous  
Maximum Continuous  
Peak  
0.2 A  
0.2 A  
0.2 A  
0.2 A  
0 A  
5.0 A  
5.0 A  
8.0 A  
2.0 A  
0.5 A  
2.0 A  
4.0 A  
+5 VSB  
0.1 A  
1
2
3
4
5
Maximum continuous total DC output power should not exceed 250 W.  
Peak load on the combined 12 V output shall not exceed 22 A.  
Maximum load on the combined 12 V output shall not exceed 18 A.  
Peak total DC output power should not exceed 300 W.  
Peak power and current loading shall be supported for a minimum of 12 seconds.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
STATUS  
High Power Recommendation  
Table 9: 350 W Load Ratings  
Load Range 1  
Voltage  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
-12 V  
Minimum Continuous  
Maximum Continuous  
Peak  
1.5 A  
1.0 A  
1.5 A  
1.5 A  
0 A  
16 A  
12 A  
16 A  
16 A  
0.5 A  
2.0 A  
See note 2  
See note 2  
+5 VSB  
0.1 A  
Load Range 2  
Voltage  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
-12 V  
Minimum Continuous  
Maximum Continuous  
Peak  
0.2 A  
0.2 A  
0.2 A  
0.2 A  
0 A  
5.0 A  
5.0 A  
8.0 A  
2.0 A  
0.5 A  
2.0 A  
5.0 A  
+5 VSB  
0.1 A  
1. Maximum continuous total DC output power should not exceed 350 W.  
2. Peak load on the combined 12 V output shall not exceed 32 A.  
3. Maximum load on the combined 12 V output shall not exceed 28 A.  
4. Peak total DC output power should not exceed 400 W.  
5. Peak power and current loading shall be supported for a minimum of 12 seconds.  
6.4.1 Standby Outputs  
STATUS  
Required  
The 5 VSB output shall be present when an AC input greater than the power supply turn on voltage is applied.  
 
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EPS1U Power Supply Design Guide, V1.1  
6.5 Voltage Regulation  
STATUS  
Required  
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 specified in Section 6.8. All outputs  
are measured with reference to the return remote sense (ReturnS) signal. The 5 V, 12 V1, 12 V2, –12 V and 5  
VSB outputs are measured at the power supply connectors referenced to ReturnS. The +3.3 V is measured at its  
remote sense signal (3.3 VS) located at the signal connector.  
Table 10: Voltage Regulation Limits  
Parameter  
+3.3 V  
+5 V  
+12 V1  
+12 V2  
MIN  
NOM  
+3.30  
+5.00  
+12.00  
+12.00  
MAX  
Units  
Vrms  
Vrms  
Vrms  
Vrms  
Tolerance  
+5/-3%  
+5/-4%  
+5/-4%  
+5/-4%  
+3.20  
+4.80  
+11.52  
+11.52  
+3.46  
+5.25  
+12.60  
+12.60  
-12 V  
+5 VSB  
-11.40  
+4.85  
-12.20  
+5.00  
-13.08  
+5.25  
Vrms  
Vrms  
+9/-5%  
+5/-4%  
STATUS  
Optional  
Some system applications may require tighter regulation limits on the +5 V output. The optional regulation limits  
are shown below.  
Table 11: Optional +5V Regulation Limits  
Parameter  
MIN  
NOM  
MAX  
Units  
Tolerance  
+5 V  
+4.85  
+5.00  
+5.25  
Vrms  
+5/-3%  
6.6 Dynamic Loading  
STATUS  
Required  
The output voltages shall remain within the limits specified in Table 10 for the step loading and within the limits  
specified in Table 12 for the capacitive loading. The load transient repetition rate shall be 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 D step load may occur anywhere within the MIN load to the MAX load shown in Table 8 and Table 9.  
Table 12: Transient Load Requirements  
Output  
+3.3 V  
Load Slew Rate Capacitive Load  
D Step Load Size  
30% of max load  
30% of max load  
65% of max load  
25% of max load  
0.5 A/ms  
0.5 A/ms  
0.5 A/ms  
0.5 A/ms  
100 mF  
100 mF  
1,000 mF  
1 mF  
+5 V  
12 V1+(12 V2)  
+5 VSB  
 
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EPS1U Power Supply Design Guide, V1.1  
6.7 Capacitive Loading  
STATUS  
Required  
The power supply shall be stable and meet all requirements with the following capacitive loading ranges.  
Table 13: Capacitive Loading Conditions  
Output  
+3.3 V  
+5 V  
MIN  
10  
MAX  
6,800  
4,700  
11,000  
Units  
mF  
mF  
mF  
10  
+12 V  
10  
-12 V  
1
1
350  
350  
mF  
mF  
+5 VSB  
6.8 Ripple / Noise  
STATUS  
Required  
The maximum allowed ripple/noise output of the power supply is defined in Table 14 below. This is measured  
over a bandwidth of 0 Hz to 20 MHz at the power supply output connectors. A 10 mF tantalum capacitor in  
parallel with a 0.1 mF ceramic capacitor are placed at the point of measurement.  
Table 14: Ripple and Noise  
+3.3 V  
+5 V  
+12 V  
-12 V  
+5 VSB  
50 mVp-p  
50 mVp-p  
120 mVp-p  
120 mVp-p  
50 mVp-p  
 
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EPS1U Power Supply Design Guide, V1.1  
6.9 Timing Requirements  
STATUS  
Required  
These are the timing requirements for the power supply operation. The output voltages must rise from 10% to  
within regulation limits (Tvout_rise) within 5 to 70 ms. The +3.3 V, +5 V and +12 V output voltages should start to  
rise at about the same time. All outputs must rise monotonically. The +5 V output needs to be greater than the  
+3.3 V output during any point of the voltage rise. The +5 V output must never be greater than the +3.3V output  
by more than 2.25 V. Each output voltage shall reach regulation within 50 ms (Tvout_on) of each other during turn  
on of the power supply. Each output voltage shall fall out of regulation within 400 ms (Tvout_off) of each other  
during turn off. Figure 4 and Figure 5 show the turn ON and turn OFF timing requirements. In Figure 5 the timing  
is shown with both AC and PSON# controlling the ON/OFF of the power supply.  
Table 15: Output Voltage Timing  
Item  
Description  
MIN  
MAX  
Units  
Tvout_rise  
Output voltage rise time from each main output.  
5
70  
ms  
Tvout_on  
All main outputs must be within regulation of each  
other within this time.  
50  
ms  
T vout_off  
All main outputs must leave regulation within this  
time.  
400  
ms  
Vout  
10%  
Vout  
V1  
V2  
V3  
V4  
Tvout_off  
Tvout_rise  
Tvout_on  
Figure 4: Output Voltage Timing  
 
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EPS1U Power Supply Design Guide, V1.1  
Table 16: Turn On/Off Timing  
Item  
Description  
MIN  
MAX  
Units  
Tsb_on_delay  
Delay from AC being applied to 5 VSB being  
within regulation.  
1500  
ms  
T ac_on_delay  
Tvout_holdup  
Tpwok_holdup  
Delay from AC being applied to all output  
voltages being within regulation.  
Time all output voltages stay within regulation  
after loss of AC.  
2500  
ms  
ms  
18  
Delay from loss of AC to deassertion of PWOK  
17  
5
ms  
ms  
Tpson_on_delay Delay from PSON# active to output voltages  
within regulation limits.  
T pson_pwok  
400  
50  
Delay from PSON# deactive to PWOK being  
deasserted.  
Delay from output voltages within regulation  
limits to PWOK asserted at turn on.  
Delay from PWOK deasserted to output  
voltages (3.3 V, 5 V, 12 V, -12 V) dropping out  
of regulation limits.  
ms  
ms  
ms  
Tpwok_on  
100  
1
1000  
T pwok_off  
Tpwok_low  
Tsb_vout  
Duration of PWOK being in the deasserted state  
during an off/on cycle using AC or the PSON#  
signal.  
Delay from 5 VSB being in regulation to O/Ps  
being in regulation at AC turn on.  
100  
50  
ms  
ms  
1000  
STATUS  
Recommended  
Item  
Description  
MIN  
MAX  
UNITS  
Tvout_holdup  
Time all output voltages stay within regulation  
after loss of AC.  
21  
ms  
Tpwok_holdup  
Tsb_holdup  
Delay from loss of AC to deassertion of PWOK.  
Time 5VSB output voltage stays within regulation  
after loss of AC.  
20  
70  
ms  
ms  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
AC Input  
Tvout_holdup  
Vout  
Tpwok_low  
TAC_on_delay  
Tpwok_off  
Tsb_on_delay  
Tpwok_on  
Tpwok_off  
Tsb_on_delay  
Tpwok_on  
Tpwok_holdup  
Tpson_pwok  
PWOK  
Tsb_holdup  
5VSB  
Tsb_vout  
Tpson_on_delay  
PSON#  
AC turn on/off cycle  
PSON turn on/off cycle  
Figure 5: Turn On/Off Timing (Signal Power Supply)  
 
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EPS1U Power Supply Design Guide, V1.1  
7 Protection Circuits  
STATUS  
Required  
Protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown. If the  
power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 seconds and a PSON# cycle  
HIGH for 1 second shall be able to reset the power supply.  
7.1 Current Limit  
STATUS  
Required  
The power supply shall have current limit to prevent the +3.3 V, +5 V, and +12 V outputs from exceeding the  
values shown in Table 17. If the current limits are exceeded, the power supply shall shutdown and latch off. The  
latch will be cleared by toggling the PSON# signal or by an AC power interruption. The power supply shall not be  
damaged from repeated power cycling in this condition. –12 V and 5 VSB shall be protected under over current  
or shorted conditions so that no damage can occur to the power supply. All outputs shall be protected so that no  
damage occurs to the power supply under a shorted output condition.  
Table 17: Over Current Protection  
Voltage  
+3.3 V  
+5 V  
Over Current Limit (Iout limit)  
110% minimum; 150% maximum  
110% minimum; 150% maximum  
110% minimum; 150% maximum  
+12 V  
7.2 240VA Protection  
STATUS  
Recommended  
System designs may require user access to energized areas of the system. In these cases the power supply may  
be required to meet regulatory 240VA limits for any power rail. Since the +12V rail combined power exceeds  
240VA it must be divided into separate channels to meet this requirement. Each separate rail needs to be limited  
to less than 20A for each +12V rail. The separate +12V rails do not necessarily need to be independently  
regulated outputs. They can share a common power conversion stage. The +12V rail is divided into two rails for  
the 250W and 350W power levels. +12V1 is dedicated for providing power to the input of the processor voltage  
regulator(s). The +12V2 rail is used to power the rest of the main board +12V power needs and peripherals  
devices.  
Table 18: Over Current Protection  
Voltage  
+3.3 V  
+5 V  
+12V1  
+12V2  
Over Current Limit (Iout limit)  
110% minimum; 150% maximum  
110% minimum; 150% maximum  
18A minimum; 20A maximum  
18A minimum; 20A maximum  
 
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EPS1U Power Supply Design Guide, V1.1  
7.3 Over Voltage Protection  
STATUS  
Required  
The power supply over voltage protection shall be locally sensed. The power supply shall shutdown and latch off  
after an over voltage condition occurs. This latch shall be cleared by toggling the PSON# signal or by an AC  
power interruption. Table 19 contains the over voltage limits. The values are measured at the output of the  
power supply’s connectors. The voltage shall never exceed the maximum levels when measured at the power  
pins of the power supply connector during any single point of fail. The voltage shall never trip any lower than the  
minimum levels when measured at the power pins of the power supply connector.  
Table 19: Over Voltage Limits  
Output Voltage  
+3.3 V  
MIN (V)  
3.9  
MAX (V)  
4.5  
+5 V  
5.7  
6.5  
+12 V1, 2  
-12 V  
+5 VSB  
13.3  
-13.3  
5.7  
14.5  
-14.5  
6.5  
7.4 Over Temperature Protection  
STATUS  
Recommended  
The power supply will be protected against over temperature conditions caused by loss of fan cooling or  
excessive ambient temperature. In an OTP condition the PSU will shutdown. When the power supply  
temperature drops to within specified limits, the power supply shall restore power automatically. The OTP circuit  
must have built in hysteresis such that the power supply will not oscillate on and off due to temperature recovering  
condition. The OTP trip level shall have a minimum of 4 °C of ambient temperature hysteresis.  
 
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EPS1U Power Supply Design Guide, V1.1  
8 Control and Indicator Functions  
The following sections define the input and output signals from the power supply.  
Signals that can be defined as low true use the following convention:  
signal# = low true  
8.1 PSON#  
STATUS  
Required  
The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns  
on the +3.3 V, +5 V, +12 V, and –12 V power rails. When this signal is not pulled low by the system, or left open,  
the outputs (except the +5 VSB and Vbias) turn off. This signal is pulled to a standby voltage by a pull-up resistor  
internal to the power supply. Refer to Figure 5 for the timing diagram.  
Table 20: PSON# Signal Characteristic  
Accepts an open collector/drain input from the system.  
Pull-up to VSB located in power supply.  
Signal Type  
PSON# = Low  
PSON# = Open or High  
ON  
OFF  
MIN  
0 V  
MAX  
1.0 V  
Logic level low (power supply ON)  
Logic level high (power supply OFF)  
Source current, Vpson = low  
Power up delay: Tpson_on_delay  
PWOK delay: Tpson_pwok  
2.0 V  
5.25 V  
4 mA  
5 ms  
400 ms  
50 ms  
Hysteresis ³ 0.3V and/or other de-bounce method  
Disabled  
£ 1.0 V  
PS is  
³ 2.0 V  
PS is  
enabled  
disabled  
Enabled  
0V  
1.0V  
2.0V  
5.25V  
Figure 6: PSON# Signal Characteristics  
 
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EPS1U Power Supply Design Guide, V1.1  
8.2 PWOK (Power OK)  
STATUS  
Required  
PWOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all the outputs are within  
the regulation limits of the power supply. When any output voltage falls below regulation limits or when AC power  
has been removed for a time sufficiently long so that power supply operation is no longer guaranteed, PWOK will  
be de-asserted to a LOW state. See Figure 5 for a representation of the timing characteristics of PWOK. The  
start of the PWOK delay time shall be inhibited as long as any power supply output is in current limit.  
Table 21: PWOK Signal Characteristics  
Open collector/drain output from power supply. Pull-up  
to VSB located in power supply.  
Power OK  
Signal Type  
PWOK = High  
PWOK = Low  
Power not OK  
MIN  
0 V  
MAX  
0.4 V  
Logic level low voltage, Isink=4 mA  
Logic level high voltage, Isource=200 mA  
Sink current, PWOK = low  
2.4 V  
5.25 V  
4 mA  
2 mA  
Source current, PWOK = high  
PWOK delay: T pwok_on  
200 ms  
1 ms  
1000 ms  
100 ms  
PWOK rise and fall time  
Power down delay: T pwok_off  
 
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EPS1U Power Supply Design Guide, V1.1  
8.3 ACWarning  
STATUS  
Optional  
This is an output signal from the power supply which provides a warning to the system that the power supply has  
lost its AC input. This signal also provides a signal to synchronize the turn on of multiple power supplies. At turn  
on, this signal is pulled LOW when the supply’s internal bulk voltage has reached a level that allows it to turn on.  
At turn off ACWarning goes HIGH when the internal bulk voltage drops low enough. The characteristics of the  
ACWarning signal is shown in Table 22: ACWarning Signal Characteristics. Refer to Figure 5 for timing diagram.  
Table 22: ACWarning Signal Characteristics  
Signal Type  
Open collector/drain output from power supply. Pull-  
up to VSB located in system.  
ACWarning = Low  
ACWarning = High  
Input voltage within operating range and power  
supply is ready to turn on.  
Input voltage is less than the operating range and the  
power supply is turning off.  
MIN  
MAX  
Logic level low voltage, Isink=4mA  
Logic level high voltage, Isink=50mA  
Sink current, ACWarning = low  
Sink current, ACWarning = high  
ACWarning Delay: Tacwarning_delay  
ACWarning rise and fall time  
0V  
0.4V  
5.25V  
4mA  
50mA  
8msec  
75VAC  
100msec  
85VAC  
Power supply turn on voltage  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
8.4 Field Replacement Unit (FRU) Signals  
STATUS  
Optional  
Two pins will be allocated for the FRU information on the power supply connector. One pin is the Serial Clock  
(SCL). The second pin is used for Serial Data (SDA). Both pins are bi-directional and are used to form a serial  
bus. The FRU circuits inside the power supply must be powered off of 5 VSB output and grounded to ReturnS  
(remote sense return). The Write Control (or Write protect) pin should be tied to ReturnS inside the power supply  
so that information can be written to the EEPROM.  
8.4.1 FRU Data  
FRU data shall be stored starting in address location 8000h through 80FFh. The FRU data format shall be  
compliant with the IPMI specifications. The current version of these specifications is available at  
http:\\developer.intel.com/design/servers/ipmi/spec.htm.  
8.4.2 FRU Data Format  
The information to be contained in the FRU device is shown in the following table.  
Table 23: FRU Device Information  
Area Type  
Description  
Common Header  
Internal Use Area  
Chassis Info Area  
Board Info Area  
As defined by the FRU document  
Not required, do not reserve  
Not applicable, do not reserve  
Not applicable, do not reserve  
8.4.2.1 Product Info Area  
As defined by the IPMI FRU document. Product information shall be defined as follows:  
Table 24: FRU Device Product Information Area  
Field Name  
Field Description  
Manufacturer Name  
{Formal name of manufacturer}  
{Manufacturer’s model number}  
Customer part number  
Product Name  
Product part/model  
number  
Product Version  
Customer current revision  
Product Serial Number  
Asset Tag  
FRU File ID  
{Defined at time of manufacture}  
{Not used, code is zero length byte}  
{Not required}  
PAD Bytes  
{Added as necessary to allow for 8-byte offset to next area}  
 
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EPS1U Power Supply Design Guide, V1.1  
8.4.2.2 MultiRecord Area  
As defined by the IPMI FRU document. The following record types shall be used on this power supply:  
·
·
·
Power Supply Information (Record Type 0x00)  
DC Output (Record Type 0x01)  
No other record types are required for the power supply.  
MultiRecord information shall be defined as follows:  
Table 25: FRU Device MultiRecord Area  
Field Information Definition  
350 {Low power versions would be 250 or 125}  
Field Name (PS Info)  
Overall Capacity (W)  
Peak VA  
400 {Low power versions would be 300 or 161}  
Inrush current (A)  
Inrush interval (ms)  
30  
5
Low end input voltage  
range 1  
90  
140  
High end input voltage  
range 1  
Low end input voltage  
range 2  
High end input voltage  
range 2  
180  
264  
A/C dropout tol. (ms)  
20  
Binary flags  
Set for: Not Hot Swap support, Auto-switch, and PFC  
Peak Wattage  
Combined wattage  
Set for: 12 s, 400 W {Low power versions would be 300W or 161W}  
Set for 5 V & 3.3 V combined wattage of 113 W {Low power versions would be 113W  
or 80}  
Predictive fail tach  
support  
Not supported, 00h value  
Field Name (Output)  
Field Description: Six outputs are to be defined from #1 to #6, as follows: +3.3 V, +5  
V, +12 V1, +12V2, -12 V, and +5 VSB.  
Output Information  
Set for: Standby on +5 VSB, No Standby on all others.  
All other output fields  
Format per IPMI specification, using parameters in the EPS1U specification.  
 
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EPS1U Power Supply Design Guide, V1.1  
8.5 LED Indicator  
STATUS  
Required  
There will be a single GREEN LED to indicate power supply status. When AC is applied to the PSU and standby  
voltages are available the LED shall BLINK GREEN. The LED shall turn ON GREEN to indicate that all the power  
outputs are available. Refer to Table 26 for conditions of the LED.  
Table 26: LED Indicators  
Power Supply Condition  
Power Supply LED  
OFF  
BLINK GREEN  
GREEN  
No AC power to PSU or PSU failure  
AC present / Only Standby Output ON  
Power supply DC outputs ON and OK  
The LED shall be visible on the power supply’s exterior face. The LED location shall meet ESD requirements.  
LED shall be securely mounted in such a way that incidental pressure on the LED shall not cause it to become  
displaced.  
9 MTBF  
STATUS  
Recommended  
The power supply shall have a minimum MTBF at continuous operation of 1) 100,000 hours at 100% load and  
45° C, as calculated by Bellcore RPP, or 2) 250,000 hours demonstrated at 100% load and 45° C.  
 
SSI  
EPS1U Power Supply Design Guide, V1.1  
10 Agency Requirements  
STATUS  
Recommended  
The power supply must comply with all regulatory requirements for its intended geographical market. Depending  
on the chosen market, regulatory requirements may vary. Although a power supply can be designed for  
worldwide compliance, there may be cost factors that drive different versions of supplies for different  
geographically targeted markets.  
This specification requires that the power supply meet all regulatory requirements for the intended market at the  
time of manufacturing. Typically this includes:  
·
·
·
·
·
·
·
UL  
CSA  
A Nordic CENELEC  
TUV  
VDE  
CISPR Class B  
FCC Class B  
The power supply, when installed in the system, shall meet immunity requirements specified in EN55024.  
Specific tests are to be EN61000-4-2 ,-3, -4, -5, -6, -8, and -11. The power supply must maintain normal  
performance within specified limits. This testing must be completed by the system EMI engineer. Conformance  
must be designated with the European Union CE Marking. Specific immunity level requirements are left to  
customer requirements.  
 

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