Enhance CFX12V Version V1.0 Power Supply Design Guide
CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
CFX12V
Compact Form Factor with 12-Volt Connector
Power Supply Design Guide
Version 1.0
Revision History
Version Release Date Notes
0.7 July, 2003
0.9 August, 2003
1.0 November 2003
• First Release
• Updated Table 6
• Updated Figure 7 mechanical drawing.
• Modified main power connector in section 3.7.1 and Figure 9
• Name change to CFX12V Compact Form Factor with 12V
Connector.
• Modified definition of Monotonically in Section 1.2
• Changed Section 2.1 to AC Input
Changed 270 Watt power configuration to 275 Watt
•
configuration and added second 12 V rail in Section 2.2.3,
Section 2.2.5, Section 3.2.2 and Table 5, Table 7 and
Table
• Updated information in Table 9, Table 10 and Table 11.
• Updated fan size information in Section 3.2.1.and Section
3.3.
• Updated main power connector in Section 3.7, Section 3.7.1
and Figure 9
•
Updated peripheral power connector in Section 3.7.2
•
Updated floppy power connector in Section 3.7.3
•
Updated 12 V power connector in Section 3.7.4
•
Update OVP information in Section 2.4.1 and in Table 14
18.
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
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Copyright Intel Corporation 2003.
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
Contents
1 Introduction .................................................................................................... 6
1.1 Scope…. ........................................................................................................................6
1.2 Terminology ...................................................................................................................6
2 Electrical ......................................................................................................... 8
2.1 AC Input. ........................................................................................................................8
2.1.1 Input Over Current Protection.......................................................................... 8
2.1.2 Inrush Current Limiting .................................................................................... 8
2.1.3 Input Under Voltage......................................................................................... 9
2.1.4 Regulatory ....................................................................................................... 9
2.1.5 Catastrophic Failure Protection ..................................................................... 10
2.2 DC Output .................................................................................................................... 10
2.2.1 DC Voltage Regulation ..................................................................................10
2.2.2 Remote Sensing ............................................................................................11
2.2.3 Typical Power Distribution .............................................................................11
2.2.4 Power Limit / Hazardous Energy Levels........................................................ 14
2.2.5 Efficiency General .........................................................................................15
2.2.6 Output Ripple/Noise ......................................................................................16
2.2.7 Output Transient Response........................................................................... 17
2.2.8 Capacitive Load............................................................................................. 18
2.2.9 Closed-loop Stability...................................................................................... 18
2.2.10 +5 VDC / +3.3 VDC Power Sequencing ........................................................ 18
2.2.11 Voltage Hold-up Time ....................................................................................18
2.3 Timing / Housekeeping / Control.................................................................................. 19
2.3.1 PWR_OK .......................................................................................................19
2.3.2 PS_ON# ........................................................................................................20
2.3.3 +5 VSB .......................................................................................................... 21
2.3.4 Power-on Time .............................................................................................. 21
2.3.5 Rise Time ......................................................................................................21
2.3.6 Overshoot at Turn-on / Turn-off..................................................................... 21
2.3.7 Reset after Shutdown ....................................................................................21
2.3.8 +5 VSB at AC Power-down ...........................................................................22
2.4 Output Protection ......................................................................................................... 22
2.4.1 Over Voltage Protection ................................................................................22
2.4.2 Short-circuit Protection .................................................................................. 22
2.4.3 No-load Operation ......................................................................................... 22
2.4.4 Over Current Protection................................................................................. 22
2.4.5 Over-temperature Protection .........................................................................23
2.4.6 Output Bypass ...............................................................................................23
3 Mechanical .................................................................................................... 24
3.1 Labeling /Marking......................................................................................................... 24
3.2 Physical Dimensions ....................................................................................................24
3.2 Thermal Requirements................................................................................................. 25
3.2.1 Fan and Venting ............................................................................................ 25
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
3.2.2 Airflow and Acoustics ....................................................................................25
3.3 Airflow / Fan ................................................................................................................. 27
3.6 AC Connector............................................................................................................... 27
3.7 DC Connectors............................................................................................................. 27
3.7.1 Main Power Connector ..................................................................................29
3.7.2 Peripheral Connector(s) ................................................................................29
3.7.3 Floppy Drive Connector................................................................................. 29
3.7.4 12 V Power Connector ..................................................................................30
3.7.5 Serial ATA Power Connector......................................................................... 30
4 Environmental .............................................................................................. 31
4.1 Temperature................................................................................................................. 31
4.2 Thermal Shock (Shipping)............................................................................................ 31
4.3 Relative Humidity ......................................................................................................... 31
4.4 Altitude Requirement.................................................................................................... 31
4.5 Mechanical Shock ........................................................................................................ 31
4.6 Random Vibration ........................................................................................................31
4.7 Acoustics......................................................................................................................32
4.8 Ecological Requirements .............................................................................................32
5 Safety............................................................................................................. 33
5.1 North America .............................................................................................................. 33
5.2 International .................................................................................................................33
6 System Cooling Considerations................................................................. 34
7 Reliability ...................................................................................................... 34
8 Applicable Documents ................................................................................ 35
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
Figures
Figure 1: Cross Loading Graph for 220W configuration ............................................................12
Figure 2. Cross Loading Graph for 240W Configuration............................................................ 13
Figure 3. Cross Loading Graph for 275W Configuration............................................................ 14
Figure 4. Differential Noise Test Setup ......................................................................................17
Figure 5. Power Supply Timing..................................................................................................19
Figure 6. PS_ON# Signal Characteristics.................................................................................. 20
Figure 7. Mechanical Outline .....................................................................................................24
Figure 8. AMCA* Standard 210 .................................................................................................26
Figure 9. Connectors (Pin-side view, not to scale) ....................................................................28
Figure 10. Serial ATA connector.................................................................................................30
Tables
Table 1 .AC Input Line Requirements.......................................................................................... 8
Table 2. DC Output Voltage Regulation..................................................................................... 10
Table 3. Typical Power Distribution for 220 W Configurations................................................... 12
Table 4. Typical Power Distribution for 240 W Configurations................................................... 13
Table 5. Typical Power Distribution for 275 W Configurations................................................... 14
Table 6. Efficiency Vs Load .......................................................................................................15
Table 7. Loading Tables for Efficiency Measurements ..............................................................15
Table 8. Energy Star Input Power Consumption........................................................................ 16
Table 9. DC Output Noise/Ripple............................................................................................... 16
Table 10. DC Output Transient Step Sizes................................................................................. 17
Table 11. Output Capacitive Loads............................................................................................. 18
Table 12. PWR_OK Signal Characteristics................................................................................. 19
Table 13. PS_ON# Signal Characteristics ..................................................................................20
Table 14. Over Voltage Protection.............................................................................................. 22
Table 15. Airflow and Acoustic Recommendations..................................................................... 25
Table 16 Loading for Acoustic Test for 220 Watts .....................................................................26
Table 17. Loading for Acoustic Test for 240 Watts .....................................................................26
Table 18. Loading for Acoustic Test for 275 Watts .....................................................................26
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
1 Introduction
1.1 Scope
This document provides design suggestions for power supply(s) that support Balanced
Technology Extended (BTX) based systems. The power supply(s) are primarily intended
for use with small form factor system designs (10 –15 liters in total system volume). It
should not be inferred that all power supplies built to support Balanced Technology
Extended (BTX) based systems must conform exactly to the content of this document,
though there are key parameters that define mechanical fit across a common set of
platforms. Since power supply needs vary depending on system configuration, the design
specifics described are not intended to support all possible systems.
1.2 Terminology
The following terms are used in this document:
Term Description
Required
Recommended
Optional
B
A
CFM
Monotonically
The status given to items within this design guide, which are required
to meet design guide and a large majority of system applications.
The status given to items within this design guide, which are not
required to meet design guide, however, are required by many system
applications.
The status given to items within this design guide, which are not
required to meet design guide, however, some system applications
may optionally use these features.
Declared sound power, LwAd. The declared sound power level shall
be measured according to ISO* 7779 for the power supply and
reported according to ISO 9296.
Cubic Feet per Minute (airflow).
A waveform changes from one level to another in a steady fashion,
without oscillation.
Noise
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The periodic or random signals over frequency band of 0 Hz to 20
MHz.
CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
Term Description
Overcurrent
PFC
Ripple
Rise Time
Surge
VSB or Standby
Voltage
MTBF
PWR_OK
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.
Power Factor Corrected.
The periodic or random signals over a frequency band of 0 Hz to 20
MHz.
Rise time is defined as the time it takes any output voltage to rise from
10% to 95% of its nominal voltage.
The condition where the AC line voltage rises above nominal voltage.
An output voltage that is present whenever AC power is applied to the
AC inputs of the supply.
Mean time between failure.
PWR_OK is a “power good” signal used by the system power supply
to indicate that the +5VDC, +3.3 VDC and +12VDC outputs are above
the undervoltage thresholds of the power supply.
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
2 Electrical
The following electrical requirements are required and must be met over the environmental
ranges as defined in Section 5 (unless otherwise noted).
2.1 AC Input
Table 1, lists AC input voltage and frequency requirements for continuous operation. The
power supply shall be capable of supplying full-rated output power over two input voltage
ranges rated 100-127 VAC and 200-240 VAC rms nominal. The correct input range for
use in a given environment may be either switch-selectable or auto-ranging. The power
supply shall automatically recover from AC power loss. The power supply must be able to
start up under peak loading at 90 VAC.
Table 1. AC Input Line Requirements
Parameter Minimum Nominal
Vin (115 VAC) 90 115 135 VAC
Vin (230 VAC) 180 230 265 VAC
Vin Frequency 47 -- 63 Hz
Iin (115 VAC) 6 A rms
Iin (230 VAC) 3 A rms
(1)
Note:
Nominal voltages for test purposes are considered to be within ±1.0 V of nominal.
(1)
Maximum Unit
2.1.1 Input Over Current Protection
The power supply is required to incorporate primary fusing for input over current
protection to prevent damage to the power supply and meet product safety requirements.
1
Fuses should be slow-blow–type or equivalent to prevent nuisance trips.
2.1.2 Inrush Current Limiting
Maximum inrush current from power-on (with power-on at any point on the AC sine) and
including, but not limited to, three line cycles, shall be limited to a level below the surge
rating of the input line cord, AC switch if present, bridge rectifier, fuse, and EMI filter
components. Repetitive ON/OFF cycling of the AC input voltage should not damage the
power supply or cause the input fuse to blow.
rms
rms
1
For Denmark and Switzerland international safety requirements, if the internal over current protective devices exceed 8A for Denmark
and 10A for Switzerland, then the power supply must pass international safety testing to EN 60950 using a maximum 16A overcurrent protected branch circuit, and this 16A (time delay fuse) branch circuit protector must not open during power supply abnormal
operation (output short circuit and component fault) testing.
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
2.1.3 Input Under Voltage
The power supply is required to contain protection circuitry such that the application of an
input voltage below the minimum specified in Section 2.1, Table 1, shall not cause damage
to the power supply.
2.1.4 Regulatory
The power supply is required to be tested and comply with the most current version
of the following regulatory specification requirements and/or standards
2.1.4.1 PRODUCT SAFETY
UL* 60950, 3rd Edition –CAN/CSA-C22.2-60950-00,
EN*60 950, 3rd Edition
IEC*60 950, 3rd Edition (CB Report to include all national deviations)
EU* Low Voltage Directive (73/23/EEC) (CE Compliance)
GB4943-90 CCIB* (China)
2.1.4.2 ELECTROMAGNETIC CAMPATIBILITY
FCC*, Class B, Part 15 (Radiated & Conducted Emissions)
CISPR* 22 / EN55022, 3rd Edition (Radiated & Conducted Emissions)
EN55024 (ITE Specific Immunity)
EN 61000-4-2 – Electrostatic Discharge
EN 61000-4-3– Radiated RFI Immunity
EN 61000-4-4– Electrical Fast Transients.
EN 61000-4-5 – Electrical Surge
EN 61000-4-6 – RF Conducted
EN 61000-4-8 – Power Frequency Magnetic Fields
EN 61000-4-11 – Voltage Dips, Short Interrupts and Fluctuations
EN61000-3-2 (Harmonics)
EN61000-3-3 (Voltage Flicker)
EU EMC Directive ((8/9/336/EEC) (CE Compliance)
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
2.1.4.3 Other Certifications and/or Declarations
GB925 (China/CCC*)
CNS13438 (Taiwan/BSMI*)
AS/NZ3548 (Australia/C-tick* based on CISPR22)
2.1.5 Catastrophic Failure Protection
It is required that should a component failure occur, the power supply should not exhibit
any of the following:
• Flame
• Excessive smoke
• Charred PCB
• Fused PCB conductor
• Startling noise
• Emission of molten material
• Earth ground fault (short circuit to ground or chassis enclosure)
2.2 DC Output
2.2.1 DC Voltage Regulation
The DC output voltages are required to remain within the regulation ranges shown in
Table 2, when measured at the load end of the output connectors under all line, load, and
environmental conditions specified in Section 4.
Table 2. DC Output Voltage Regulation
Output Range Min. Nom. Max. Unit
(1)
±5% +11.40 +12.00 +12.60 Volts
(1)
±5% +11.40 +12.00 +12.60 Volts
(2)
±5% +3.14 +3.30 +3.47 Volts
Note:.
(2)
+12V1DC
+12V2DC
+5VDC ±5% +4.75 +5.00 +5.25 Volts
+3.3VDC
-12VDC ±10% -10.80 -12.00 -13.20 Volts
+5VSB ±5% +4.75 +5.00 +5.25 Volts
(1)
At +12 VDC peak loading, regulation at the +12 VDC output can go to ± 10%.
Voltage tolerance is required at main connector and S-ATA connector (if used).
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CFX12V Power Supply Design Guide Rev 1.0
Compact Form Factor with 12-Volt Connector
2.2.2 Remote Sensing
The +3.3 VDC output should have provisions for remote sensing to compensate for
excessive cable drops. The default sense should be connected to pin 11 of the main power
connector. The power supply should draw no more than 10 mA through the remote sense
line to keep DC offset voltages to a minimum.
2.2.3 Typical Power Distribution
DC output power requirements and distributions will vary based on specific system options
and implementation.
Significant dependencies include the quantity and types of processors, memory, add-in
card slots, and peripheral bays, as well as support for advanced graphics or other features.
through and Figure 1 through Figure 3 shows the power distribution and cross loading
tables for power supplies in the range of 220 W to 275W. These are recommended but it is
ultimately the responsibility of the designer to define a power budget for a given target
product and market.
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