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ATX12V Specific Guideli
nes 2.53
Design Guide
49
12
ATX12V Spe
cific Guidelines
2.53
For
ATX Form Factor with 12
-
volt connector power supplies.
All Form Factors Revision Summary:
PSU DG
CFX12V
LFX12V
ATX12V
SFX12V
TFX12V
Flex ATX
1.31
1.5
1.3
2.4
3.3
2.4
1.1
1.4
1.6
1.4
2.5
3.4
2
.5
1.2
1.42
1.62
1.42
2.52
3.42
2.52
1.22
1.43
1.63
1.43
2.
53
3.43
2.53
1.23
Figure
12
-1:
Power Supply Dimensions for Chassis
Not Requiring
Top Venting
48
50
Table of Contents
Default Chapter
3
Table of Contents
3
1 Introduction
8
Alternative Low Power Mode for Power Supplies
8
References
8
Terminology
9
Table 1-1: Conventions and Terminology
9
Table 1-2: Support Terminology
10
2 Processor Configurations
11
Processor Configurations - Recommended
11
Table 2-1: 12V2 Current for Processor Configurations
11
High End Desktop Market Processor Considerations
12
Modular Power Supply Connectors
12
Overclocking Recommendations
13
3 Electrical
14
AC Input - Required
14
Input over Current Protection - Required
14
Inrush Current - Required
14
Input under Voltage - Required
14
Table 3-1: AC Input Line Requirements
14
DC Output - Required
15
DC Voltage Regulation - Required
15
DC Output Current - Required
15
Table 3-2: DC Output Voltage Regulation
15
Table 3-3: DC Output Transient Step Sizes
15
Remote Sensing - Recommended
16
Other Low Power System Requirements - Recommended
16
Table 3-4: Recommended System DC and AC Power Consumption
16
Output Ripple Noise - Required
17
Figure 3-1: Differential Noise Test Setup
17
Table 3-5: DC Output Noise/Ripple
17
Capacitive Load - Recommended
18
Closed Loop Stability - Required
18
+5V DC / +3.3V DC Power Sequencing - Required
18
Table 3-6: Output Capacitive Loads
18
Voltage Hold-Up Time - Required
19
12V2 DC Minimum Loading - Required
19
Figure 3-2: Power Supply Timing
19
Table 3-7: 12V2 DC Minimum Current
19
Timing, Housekeeping, and Control - Required
20
Figure 3-3: Power on Timing
20
Table 3-8: Power Supply Timing
20
Power-Up Cross Loading Condition - Required
21
PWR_OK - Required
21
Table 3-9: PWR_OK Signal Characteristics
21
PS_ON# - Required
22
Table 3-10: PS_ON# Signal Characteristics
22
5VSB - Required
23
Figure 3-4: PS_ON# Signal Characteristics
23
Figure 3-5: +5VSB Power on Timing Versus VAC
24
Power-On Time - Required
24
Rise Time - Required
24
Overshoot at Turn-On/Turn-Off - Required
25
Reset after Shutdown
25
5VSB at Power-Down - Required
25
Figure 3-6: Rise Time Characteristics
25
5VSB Fall Time - Recommendation
26
Output Protection
26
Over Voltage Protection (OVP) - Required
26
Figure 3-7: 5VSB Fall Time
26
Table 3-11: over Voltage Protection
26
Short Circuit Protection (SCP) - Required
27
Load Situation - Required
27
Over Current Protection (OCP) - Required
27
Over Temperature Protection (OTP) - Required
27
Output Bypass - Required
27
Separate Current Limit for 12V2 - Recommended
27
Overall Power Supply Efficiency Levels
28
Power Supply Efficiency for Energy Regulations - Energy Star* and CEC PC Computers with High Expandability Score - Recommended
28
Table 3-12: Efficiency Versus Load Minimum Requirements
28
Table 3-13: Low Load Efficiency Requirements Increase over Time
28
Table 3-14: Efficiency Versus Load for Energy Star
29
Table 3-15: Efficiency Versus Load for CEC PC Computers with High Expandability
29
4 Mechanical
30
Labeling and Marking - Recommended
30
Connectors - Required
30
AC Connector
30
DC Connectors
30
Figure 4-1: Connectors (Pin-Side View, Not to Scale)
31
Table 4-1: Main Power Connector Pin-Out
32
Table 4-2: Peripheral Connector Pin-Out
32
Table 4-3: Floppy Connector Pin-Out
33
Table 4-4: Pcie* Graphics Card 6 Pin Connector Pin-Out
33
Table 4-5: PCI-E Graphics Card 8 Pin (6+2) Connector Pin-Out
33
Table 4-6: +12 V Power 4 Pin Connector Pin-Out
34
Table 4-7: +12 V Power 8 Pin Connector Pin-Out
34
Airflow and Fans - Recommended
35
Fan Location and Direction
35
Figure 4-2: Serial ATA* Power Connector
35
Table 4-8: Serial ATA* Power Connector Pin-Out
35
Fan Size and Speed
36
Venting
36
5 Acoustics
37
Acoustics - Recommended
37
Table 5-1: Recommended Power Supply Acoustic Targets
37
6 Environmental
38
Temperature - Recommended
38
Thermal Shock (Shipping) - Recommended
38
Humidity - Recommended
38
Altitude - Recommended
38
Mechanical Shock - Recommended
39
Random Vibration - Recommended
39
7 Electromagnetic Compatibility
40
Emissions - Required
40
Immunity - Required
40
Input Line Current Harmonic Content - Optional
40
Table 7-1: EMC Requirement by Country
40
Magnetic Leakage Field - Required
41
Voltage Fluctuations and Flicker - Required
41
8 Safety
42
North America - Required
42
International - Required
43
Proscribed Materials - Required
43
Catastrophic Failure Protection - Recommended
43
9 Reliability
44
Reliability - Recommended
44
Reliability - PS_ON# Toggle for S0Ix Mode - Required
44
10 CFX12V Specific Guidelines 1.63
45
Physical Dimensions - Required
45
Figure 10-1: CFX12V Mechanical Outline
45
11 LFX12V Specific Guidelines 1.43
46
Physical Dimensions - Required
46
Figure 11-1: LFX 12V Mechanical Outline
46
Figure 11-2: Mechanical Details
47
Figure 11-3: PSU Slot Feature Detail
47
Figure 11-4: Recommended Chassis Tab Feature
48
12 ATX12V Specific Guidelines 2.53
49
Figure 12-1: Power Supply Dimensions for Chassis Not Requiring Top Venting
49
Figure 12-2: Power Supply Dimensions for Chassis Requiring Top Venting
50
13 SFX12V Specific Guidelines 3.43
51
Lower Profile Package - Physical Dimensions - Required
51
Fan Requirements - Required
51
Figure 13-1: 40 MM Profile Mechanical Outline
52
Figure 13-2: Chassis Cutout
52
Top Fan Mount Package - Physical Dimensions -Required
53
Fan Requirements - Required
53
Figure 13-3: Top Mount Fan Profile Mechanical Outline
53
Reduced Depth Top Mount Fan - Physical
54
Fan Requirements - Required
54
Figure 13-4: Chassis Cutout
54
Figure 13-5: Recessed Fan Mounting
54
Standard SFX Profile Package - Physical Dimensions - Required
55
Figure 13-6: Reduced Depth Top Mount Fan Profile Mechanical Outline
55
Figure 13-7: Chassis Cutout
55
Fan Requirements - Required
56
Figure 13-8: 60 MM Mechanical Outline
56
PS3 Form Factor- Physical Dimensions - Required
57
Fan Requirements - Required
57
Figure 13-9: Chassis Cutout
57
Figure 13-10: PS3 Mechanical Outline
58
14 TFX12V Specific Guidelines 2.53
59
Physical Dimensions - Required
59
Figure 14-1: Mechanical Outline
59
Figure 14-2: Dimensions and Recommended Feature Placements (Not to Scale)
60
Mounting Options - Recommended
61
Figure 14-3: Power Supply Mounting Slot Detail
61
Chassis Requirements - Recommended
62
Figure 14-4: Fan Right and Fan Left Orientations of Power Supply in a Chassis
62
Figure 14-5: Suggested TFX12V Chassis Cutout
62
Figure 14-6: Suggested Mounting Tab (Chassis Feature)
63
15 Flex ATX Specific Guidelines 1.23
64
Physical Dimensions - Required
64
Figure 15-1: Mechanical Outline
64
Figure 15-2: Dimensions and Recommended Feature Placements (Not to Scale)
65
4
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Intel ATX Specifications
General
Brand
Intel
Model
ATX
Category
Power Supply
Language
English
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