Intel ATX 3.0 - LFX12 V Specific Guidelines 2.0; Physical Dimensions

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LFX12V Specific

Guidelines 2.0

68 336521

12 LFX12V Specific Guidelines 2.0

For Low Profile Form Factor with 12-volt connector power supplies.

All Form Factors Revision Summary:

PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX

2.0 2.0 2.0 3.0 4.0 3.0 2.0

12.1 Physical Dimensions - REQUIRED

The power supply shall be enclosed and meet the physical outline shown in Figure

12-1, applicable. Mechanical details are shown in Figure 12-2. Details on the power

supply slot feature are shown in Figure 12-3. The recommended chassis slot feature

details are shown in Figure 12-4.

Figure 12-1: LFX 12V Mechanical Outline

Main Page

Table of Contents3
Introduction13
Alternative Low Power Mode for Power Supplies13
Reference Documentation13
Terminology15
Table 1-1: Conventions and Terminology15
Table 1-2: Support Terminology16
Processor Configurations17
Processor Configurations - RECOMMENDED17
High End Desktop Market Processor Considerations17
Table 2-1: 12V2 Current for Processor Configurations17
Modular Power Supply Connectors18
Overclocking Recommendations19
PCI Express* Add-In Card Considerations20
Pcie* Add-In Card Power Excursions20
Table 3-1: PCI Express* CEM Add-In Card Power Excursion Limits Table21
Pcie* Add-In Card and PSU Power Budgets22
Figure 3-1: PCI Express* CEM Add-In Card Power Excursion Limits Chart22
Table 3-2: Pcie* AIC and PSU Power Budget Used for Peak Power Excursion Test Cases23
PSU Power Excursion24
Table 3-3: Pcie* AIC and PSU Power Budget Used for Peak Power Excursion24
Pcie* AIC Auxiliary Power Connectors25
Figure 3-2: Duty Cycle Definition25
Table 3-4: Duty Cycle Example Test Criteria for a 1000W PSU - RMS25
Pcie* Add-In Card Auxiliary Power Connectors Sideband Signals26
Table 3-5: Auxiliary Power Connectors Power Supply Rail Requirements - +12V Only26
Sense1 / Sense0 (Required)27
CARD_PWR_STABLE (Optional)27
Table 3-6: PCI Express* 12VHPWR Connector Power Limits27
CARD_CBL_PRES# (Optional)28
Sideband Signals DC Specifications (Required)29
Table 3-7: PCI Express* 12VHPWR Connector - Sideband Signal DC Specifications29
Electrical30
AC Input - REQUIRED30
Input over Current Protection - REQUIRED30
Inrush Current - REQUIRED30
Input under Voltage - REQUIRED30
Table 4-1: AC Input Line Requirements30
DC Output - REQUIRED31
DC Voltage Regulation - REQUIRED31
DC Output Current - REQUIRED31
Table 4-2: DC Output Voltage Regulation31
Table 4-3: DC Output Transient Step Sizes31
Table 4-4: DC Output Transient Slew Rate32
Remote Sensing - RECOMMENDED33
Other Low Power System Requirements33
Output Ripple Noise - REQUIRED33
Table 4-5: Recommended Standby Rail DC and AC Power Efficiency33
Capacitive Load - RECOMMENDED34
Figure 4-1: Differential Noise Test Setup34
Table 4-6: DC Output Noise/Ripple34
Table 4-7: Output Capacitive Loads34
Closed Loop Stability - REQUIRED35
+5V DC / +3.3V DC Power Sequencing - REQUIRED35
Figure 4-2: Power Supply Timing35
Voltage Hold-Up Time - REQUIRED36
12V2 DC Minimum Loading - REQUIRED36
Timing, Housekeeping and Control - REQUIRED36
Figure 4-3: Power on Timing36
Table 4-8: 12V2 DC Minimum Current36
Pwr_Ok - Required37
Table 4-9: Power Supply Timing37
Power-Up Cross Loading Condition - REQUIRED38
Ps_On# - Required38
Table 4-10: PWR_OK Signal Characteristics38
Table 4-11: PS_ON# Signal Characteristics38
5Vsb - Required39
Figure 4-4: PS_ON# Signal Characteristics39
Power-On Time - REQUIRED40
Rise Time - REQUIRED40
Figure 4-5 +5VSB Power on Timing Versus VAC40
Overshoot at Turn-On / Turn-Off - REQUIRED41
Reset after Shutdown41
5VSB at Power-Down - REQUIRED41
Figure 4-6: Rise Time Characteristics41
5VSB Fall Time - RECOMMENDATION42
Output Protection42
Over Voltage Protection (OVP) - REQUIRED42
Figure 4-7: 5VSB Fall Time42
Table 4-12: over Voltage Protection42
Short Circuit Protection (SCP) - REQUIRED43
Load Situation - REQUIRED43
Over Current Protection (OCP) - REQUIRED43
Over Temperature Protection (OTP) - REQUIRED43
Output Bypass - REQUIRED43
Separate Current Limit for 12V2 - OPTIONAL43
Overall Power Supply Efficiency Levels44
Table 4-13: Efficiency Versus Load Minimum Requirements44
Table 4-14: Low Load Efficiency Requirements44
Power Supply Efficiency for Energy Regulations - ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score - RECOMMENDED45
Table 4-15: Efficiency Versus Load for ENERGY STAR45
Table 4-16: Efficiency Versus Load for CEC PC Computers with High Expandability Computers45
Mechanical47
Labeling and Marking - RECOMMENDED47
Figure 5-1: 12VHPWR Connector Labeling Example47
Connectors - REQUIRED48
AC Connector48
DC Connectors48
Figure 5-2: Connectors (Pin-Side View, Not to Scale)48
Table 5-1: Main Power Connector Pin-Out48
Main Power Connector - REQUIRED49
Peripheral Connectors49
Floppy Drive Connector - Do Not Include (for Historical Reference Only)50
PCI-Express* (Pcie*) Add-In Card Connectors (Recommended)50
Table 5-2: Peripheral Connector Pin-Out50
Table 5-3: Floppy Connector Pin-Out50
Table 5-4: Pcie* 2X3 Auxiliary Power Connector Pin Assignment (75 Watts)51
Table 5-5: Pcie* 2X4 Auxiliary Power Connector Pin Assignment (150 Watts)52
Table 5-6: Pcie* 2X4 Auxiliary Power Connector Sense Pin Decoding by AIC52
Figure 5-3: 12VHPWR Cable Plug Connector53
Figure 5-4: 12VHPWR Cable Assembly54
+12 V Power Connector55
Table 5-7: Pcie* 12VHPWR Auxiliary Power Connector Pin Assignment (600 Watts)55
Table 5-8: +12 V Power 4 Pin Connector Pin-Out55
Serial ATA* Connectors - REQUIRED56
Table 5-9: +12 V Power 8 Pin Connector Pin-Out56
Table 5-10: Serial ATA* Power Connector Pin-Out56
Airflow and Fans - RECOMMENDED57
Fan Location and Direction57
Fan Size and Speed57
Figure 5-5: Serial ATA* Power Connector57
Venting58
Acoustics59
Acoustics - RECOMMENDED59
Table 6-1: Recommended Power Supply Acoustic Targets59
Environmental60
Temperature - RECOMMENDED60
Thermal Shock (Shipping) - RECOMMENDED60
Humidity - RECOMMENDED60
Altitude - RECOMMENDED60
Mechanical Shock - RECOMMENDED60
Random Vibration - RECOMMENDED61
Electromagnetic Compatibility62
Emissions - REQUIRED62
Immunity - REQUIRED62
Input Line Current Harmonic Content - OPTIONAL62
Magnetic Leakage Field - REQUIRED62
Table 8-1: EMC Requirement by Country62
Voltage Fluctuations and Flicker - REQUIRED63
Safety64
North America - REQUIRED64
International - REQUIRED64
Proscribed Materials - REQUIRED65
Catastrophic Failure Protection - RECOMMENDED65
Reliability66
Reliability - RECOMMENDED66
Reliability - PS_ON# Toggle for S0Ix Mode - REQUIRED66
CFX12V Specific Guidelines 2.067
Physical Dimensions - REQUIRED67
Figure 11-1: CFX12V Mechanical Outline67
LFX12V Specific Guidelines 2.068
Physical Dimensions - REQUIRED68
Figure 12-1: LFX 12V Mechanical Outline68
Figure 12-2: Mechanical Details69
Figure 12-3: PSU Slot Feature Detail70
Figure 12-4: Recommended Chassis Tab Feature71
ATX12V Specific Guidelines 3.072
Figure 13-1: Power Supply Dimensions for Chassis that Does Not Require Top Venting72
Figure 13-2: Power Supply Dimensions for Chassis that Require Top Venting73
SFX12V Specific Guidelines 4.074
Lower Profile Package - Physical Dimensions - REQUIRED74
Fan Requirements - REQUIRED74
Figure 14-1: 40 MM Profile Mechanical Outline75
Figure 14-2: Chassis Cutout75
Top Fan Mount Package - Physical Dimensions -REQUIRED76
Fan Requirements - REQUIRED76
Figure 14-3: Top Mount Fan Profile Mechanical Outline77
Reduced Depth Top Mount Fan - Physical78
Fan Requirements - REQUIRED78
Figure 14-4: Chassis Cutout78
Figure 14-5: Recessed Fan Mounting78
Figure 14-6: Reduced Depth Top Mount Fan Profile Mechanical Outline79
Figure 14-7: Chassis Cutout79
Standard SFX Profile Package - Physical Dimensions - REQUIRED80
Fan Requirements - REQUIRED80
Figure 14-8: 60 MM Mechanical Outline80
PS3 Form Factor-Physical Dimensions - REQUIRED81
Fan Requirements - REQUIRED81
Figure 14-9: Chassis Cutout81
Figure 14-10: PS3 Mechanical Outline82
TFX12V Specific Guidelines 3.083
Physical Dimensions - REQUIRED83
Figure 15-1: Mechanical Outline83
Figure 15-2: Dimensions and Recommended Feature Placements (Not to Scale)84
Mounting Options - RECOMMENDED85
Figure 15-3: Power Supply Mounting Slot Detail85
Chassis Requirements - RECOMMENDED86
Figure 15-4: Fan Right and Fan Left Orientations of Power Supply in a Chassis86
Figure 15-5: Suggested TFX12V Chassis Cutout86
Figure 15-6: Suggested Mounting Tab (Chassis Feature)87
Flex ATX Specific Guidelines 2.088
Physical Dimensions - REQUIRED88
Figure 16-1: Mechanical Outline88
Figure 16-2: Dimensions and Recommended Feature Placements (Not to Scale)89

Intel ATX 3.0 - LFX12 V Specific Guidelines 2.0; Physical Dimensions - REQUIRED

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