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TFX12V
User Manual
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Intel TFX12V User Manual

TFX12V
Thin Form Factor with 12-Volt Connector
Power Supply Design Guide
TFX12V Power Supply Design Guide Thin Form Factor with 12-V Connector Version 2.0
IMPORTANT INFORMATION AND DISCLAIMERS
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Copyright
*
Other names and brands may be claimed as the property of others
2003 - 2004 Intel Corporation. All rights reserved.
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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector

Revision History

Version Release Date Notes
1.0 April, 2002 • Public release
1.01 May, 2002 • Added dimension in Figure 5 to clarify location of mounting slot feature
1.2 April, 2003 • Updated power and current guidance
• Added efficiency targets for light and nominal loading
• Increased minimum Efficiency at full load from 68% to 70%
• Updated guidance for standby efficiency
• Added Serial ATA connector
• Updated Revision history table
• Reformat title page
• Added cross loading tables
• Added loading tables for efficiency measurement points
• Minor modifications to Energy Star
2.0 February, 2004
• Updated power and current guidance
• Updated cross regulation graphs
• Updated load tables
• Updated required efficiency targets. Added recommended efficiency
targets. Increased required minimum efficiency at typical and light load.
• Required Serial ATA connector
• Added Terminology section
• Main Power Connector changes to 2x12.
• Separate current limit on 2x2 connector for 12V2 rail
• 12V2 requirements added
Version 2.0
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TFX12V Power Supply Design Guide Thin Form Factor with 12-V Connector Version 2.0

Contents

1 Introduction ..................................................................................................... 7
1.1 TFX12V Scope ............................................................................................................ 7
1.2 TFX12V Overview ....................................................................................................... 7
1.2.1 Small System Optimized Profile .................................................................... 7
1.2.2 Improved Acoustics....................................................................................... 8
1.3 Key Changes for TFX12V Version 2.0......................................................................... 8
1.3.1 Increased +12 VDC Output Capability........................................................... 8
1.3.2 Minimum Efficiency ....................................................................................... 8
1.3.3 Main Power Connector.................................................................................. 8
1.3.4 Separate Current Limit for 12V2 on the 2x2 Connector................................. 8
1.4 Terminology................................................................................................................. 9
2 Electrical ........................................................................................................ 10
2.1 AC Input 10
2.1.1 Input Over Current Protection ......................................................................10
2.1.2 Inrush Current Limiting.................................................................................10
2.1.3 Input Under Voltage .....................................................................................10
2.1.4 Regulatory....................................................................................................11
2.1.5 Catastrophic Failure Protection ....................................................................12
2.2 DC Output ..................................................................................................................12
2.2.1 DC Voltage Regulation.................................................................................12
2.2.2 Remote Sensing...........................................................................................12
2.2.3 Typical Power Distribution............................................................................13
2.2.4 Power Limit / Hazardous Energy Levels.......................................................16
2.2.5 Efficiency General........................................................................................16
2.2.6 Other Low Power System Requirements......................................................18
2.2.7 Output Ripple/Noise .....................................................................................18
2.2.8 Output Transient Response .........................................................................19
2.2.9 Capacitive Load ...........................................................................................20
2.2.10 Closed-loop Stability.....................................................................................20
2.2.11 +5 VDC / +3.3 VDC Power Sequencing .......................................................20
2.2.12 Voltage Hold-up Time...................................................................................20
2.3 Timing / Housekeeping / Control.................................................................................21
2.3.1 PWR_OK .....................................................................................................22
2.3.2 PS_ON#.......................................................................................................22
2.3.3 +5 VSB.........................................................................................................23
2.3.4 Power-on Time.............................................................................................23
2.3.5 Rise Time.....................................................................................................24
2.3.6 Overshoot at Turn-on / Turn-off....................................................................24
2.3.7 Reset after Shutdown...................................................................................24
2.3.8 +5 VSB at AC Power-down ..........................................................................24
2.4 Output Protection .......................................................................................................24
2.4.1 Over Voltage Protection ...............................................................................24
2.4.2 Short-circuit Protection.................................................................................25
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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
2.4.3 No-load Operation........................................................................................25
2.4.4 Over Current Protection ...............................................................................25
2.4.5 Over-temperature Protection........................................................................25
2.4.6 Output Bypass..............................................................................................25
3 Mechanical.....................................................................................................26
3.1 Labeling /Marking .......................................................................................................26
3.2 Physical Dimensions...................................................................................................26
3.3 Mounting Options .......................................................................................................29
3.4 Chassis Requirements................................................................................................30
3.5 Airflow / Fan ...............................................................................................................31
3.6 AC Connector.............................................................................................................31
3.7 DC Connectors...........................................................................................................32
3.7.1 TFX12V Main Power Connector...................................................................33
3.7.2 Peripheral Connector(s) ...............................................................................33
3.7.3 Floppy Drive Connector................................................................................33
3.7.4 +12 V Power Connector ...............................................................................34
3.7.5 Serial ATA Power Connector........................................................................34
4 Environmental ...............................................................................................35
4.1 Temperature...............................................................................................................35
4.2 Thermal Shock (Shipping) ..........................................................................................35
4.3 Relative Humidity........................................................................................................35
4.4 Altitude Requirement..................................................................................................35
4.5 Mechanical Shock ......................................................................................................35
4.6 Random Vibration.......................................................................................................36
4.7 Acoustics....................................................................................................................36
4.8 Ecological Requirements............................................................................................36
5 Safety .............................................................................................................37
5.1 North America ............................................................................................................37
5.2 International................................................................................................................37
6 Electromagnetic Compatibility ....................................................................38
6.1 Emissions...................................................................................................................38
6.2 Immunity.....................................................................................................................38
6.3 Input Line Current Harmonic Content .........................................................................39
6.4 Magnetic Leakage Fields............................................................................................39
6.5 Voltage Fluctuations and Flicker.................................................................................39
7 System Cooling Considerations..................................................................40
8 Reliability .......................................................................................................40
9 Applicable Documents .................................................................................40
TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2.0
Figures
Figure 1. TFX12V Power Supply...................................................................................................... 7
Figure 2. Cross Loading Graph for 180W Configuration................................................................. 13
Figure 3. Cross Loading Graph for 220W Configuration................................................................. 14
Figure 4. Cross Loading Graph for 240W Configuration................................................................. 15
Figure 5 Cross Loading Graph for 270W Configuration................................................................. 16
Figure 6. Differential Noise Test Setup.......................................................................................... 19
Figure 7. Power Supply Timing ..................................................................................................... 21
Figure 8. PS_ON# Signal Characteristics...................................................................................... 23
Figure 9. Power Supply Dimensions and Recommended Feature Placements (not to scale) ....... 27
Figure 10. Power Supply Mounting Slot Detail ............................................................................... 28
Figure 11. Fan Right and Fan Left Orientations of Power Supply in a Chassis .............................. 29
Figure 12. Suggested TFX12V Chassis Cutout.............................................................................. 30
Figure 13. Suggested Mounting Tab (chassis feature)................................................................... 30
Figure 14. TFX12V Connectors (Pin-side view, not to scale) ......................................................... 32
Figure 15. Serial ATA Connector 34
Tables
Table 1. AC Input Line Requirements........................................................................................... 10
Table 2. DC Output Voltage Regulation........................................................................................ 12
Table 3. Typical Power Distribution for 180 W TFX12V Configurations......................................... 13
Table 4. Typical Power Distribution for 220 W TFX12V Configurations......................................... 14
Table 5. Typical Power Distribution for 240 W TFX12V Configurations......................................... 15
Table 6: Typical Power Distribution for 270 W SFX12V Configurations ........................................ 16
Table 7: Efficiency Vs Load .......................................................................................................... 17
Table 8. Loading Table for Efficiency Measurements ................................................................... 17
Table 9. Energy Star Input Power Consumption........................................................................... 18
Table 10. DC Output Noise/Ripple.................................................................................................. 18
Table 11. DC Output Transient Step Sizes ..................................................................................... 19
Table 12. Output Capacitive Loads................................................................................................. 20
Table 13. PWR_OK Signal Characteristics ..................................................................................... 22
Table 14. PS_ON# Signal Characteristics ...................................................................................... 23
Table 15. Over Voltage Protection.................................................................................................. 25
Table 16. Harmonic Limits, Class D Equipment.............................................................................. 39
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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector

1 Introduction

1.1 TFX12V Scope

This document provides design suggestions for a small form factor power supply that is primarily intended for use with small form factor system designs (9-15 liters in total system volume). It should not be inferred that all Thin Form Factor with 12 Volt connector (TFX12V) power supplies 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.
Version 2.0
Figure 1. TFX12V Power Supply

1.2 TFX12V Overview

This section provides a brief overview of the unique features of the Thin Form Factor with 12 Volt connector (TFX12V) power supply design and a summary of the changes included in revision 1.2.

1.2.1 Small System Optimized Profile

The increase in demand for smaller systems results in unique system layout challenges. The Thin Form Factor with 12 Volt connector (TFX12V) configuration has been optimized for small and low profile microATX and FlexATX system layouts. The long narrow profile of the power supply (shown in Figure 1) fits easily into low profile systems. The fan placement can be used to efficiently exhaust air from the processor and core area of the motherboard, making possible smaller, more efficient systems using common industry ingredients.
TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2.0

1.2.2 Improved Acoustics

As desktop systems become smaller, they are placed in more exposed areas in the home and work place. The smaller systems are no longer confined to the floor or under the desk, but are placed on the desktop next to the user. In these situations, noise becomes an important factor to the end user. Thin Form Factor with 12 Volt connector (TFX12V) supplies should use fan speed control techniques to provide a low acoustic profile, while providing ample cooling to internal components when required.

1.3 Key Changes for TFX12V Version 2.0

This section briefly summarizes the major changes made to this document that now defines ATX12V power supply. With the move to 12V voltage regulators for the processor, ATX guidelines for 5V as main power are no longer provided.

1.3.1 Increased +12 VDC Output Capability

System components that use 12V are continuing to increase in power. In cases where expected current requirements is greater than 18A a second 12 V rail should be made available. ATX12V power supplies should be designed to accommodate these increased +12 VDC currents.

1.3.2 Minimum Efficiency

Minimum measured efficiency is required to be 70% at full, typical (50%) load and 60% at light (20%) load. New recommended guidance has been added to provide direction for expected future requirements.

1.3.3 Main Power Connector

The 2 x 12 main power connector replaces the 2 x 10 connector. This change was made to support 75 watt PCI Express* requirements.

1.3.4 Separate Current Limit for 12V2 on the 2x2 Connector

The 12V rail on the 2 x 2 power connector should be a separate current limited output to meet the requirements of UL and EN 60950.
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1.4 Terminology

The following terms are used in this document:
Term Description
TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
Required
Recommended
Optional
B
A
CFM
Monotonically
Noise
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 intermediate retracement or oscillation.
The periodic or random signals over frequency band of 0 Hz to 20 MHz.
TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2.0

2 Electrical

The following electrical requirements 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 200­240 VAC rms nominal. The correct input range for use in a given environment may be either switch­selectable 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* Maximum Unit
Vin (115 VAC) 90 115 135 VAC
Vin (230 VAC) 180 230 265 VAC
Vin Frequency 47 -- 63 Hz
rms
rms
*Note: Nominal voltages for test purposes are considered to be within ±1.0 V of nominal.

2.1.1 Input Over Current Protection

The power supply shall incorporate primary fusing 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.1

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.

2.1.3 Input Under Voltage

The power supply shall 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.
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 over-current 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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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector

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, 3
IEC*60 950, 3
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, 3
rd
Edition
rd
Edition (CB Report to include all national deviations)
rd
Edition (Radiated & Conducted Emissions)
Version 2.0
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)
2.1.4.3 Other Certifications and/or Declarations
GB925 (China/CCC*)
CNS13438 (Taiwan/BSMI*)
AS/NZ3548 (Australia/C-tick* based on CISPR22)
TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2.0

2.1.5 Catastrophic Failure Protection

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 shall 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. The voltage regulation limits shall be maintained under continuous operation for any steady state temperature and operating conditions specified in Section 4.
Table 2. DC Output Voltage Regulation
Output Range Minimum Nominal Maximum Unit
+12 V1DC ±5% +11.40 +12.00 +12.60 Volts
+12 V2DC (Note) ±5% +11.40 +12.00 +12.60 Volts
+5 VDC ±5% +4.75 +5.00 +5.25 Volts
+3.3 VDC ±5% +3.14 +3.30 +3.47 Volts
-12 VDC ±10% -10.80 -12.00 -13.20 Volts
+5 VSB ±5% +4.75 +5.00 +5.25 Volts
Note: At +12 VDC peak loading, regulation at the +12 VDC output can go to ± 10%.

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.
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