ATX Version 3.0 Multi Rail Desktop Platform Power Supply
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Legal Revision History Introduction Processor Configurations PCI Express* Add-in Card Considerations Electrical Mechanical Acoustics Environmental Electromagnetic Compatibility Safety Reliability CFX12V Specific Guidelines 2.0 LFX12V Specific Guidelines 2.0 ATX12V Specific Guidelines 3.0 SFX12V Specific Guidelines 4.0 TFX12V Specific Guidelines 3.0 Flex ATX Specific Guidelines 2.0
DC Voltage Regulation – REQUIRED DC Output Current – REQUIRED Remote Sensing - RECOMMENDED Other Low Power System Requirements Output Ripple Noise - REQUIRED Capacitive Load – RECOMMENDED Closed Loop Stability - REQUIRED +5V DC / +3.3V DC Power Sequencing - REQUIRED Voltage Hold-Up Time - REQUIRED 12V2 DC Minimum Loading - REQUIRED
Over Voltage Protection (OVP) – REQUIRED Short Circuit Protection (SCP) – REQUIRED No-Load Situation – REQUIRED Over Current Protection (OCP) – REQUIRED Over Temperature Protection (OTP) – REQUIRED Output Bypass – REQUIRED Separate Current Limit for 12V2 - OPTIONAL Overall Power Supply Efficiency Levels Power Supply Efficiency for Energy Regulations - ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score - RECOMMENDED
SFX12V Specific Guidelines 4.0 Lower Profile Package - Physical Dimensions - REQUIRED Fan Requirements - REQUIRED Top Fan Mount Package - Physical Dimensions -REQUIRED Fan Requirements - REQUIRED Reduced Depth Top Mount Fan - Physical Fan Requirements - REQUIRED Standard SFX Profile Package – Physical Dimensions - REQUIRED Fan Requirements - REQUIRED PS3 Form Factor-Physical Dimensions - REQUIRED Fan Requirements - REQUIRED
Mounting Options - RECOMMENDED
The TFX12V mechanical design provides two options for mounting in a system chassis. The unit can be mounted using one of the mounting holes on the front end (non-vented end) or a chassis feature can be designed to engage the slot provided in the bottom of the supply. In order to accommodate different system chassis layouts, the TFX12V power supply is also designed to mount in two orientations (fan left and fan right) as shown in Figure 15-4. A mounting hole and slot should be provided for each orientation as shown in Figure 15-2. Details of a suggested geometry for the mounting slot are shown in Figure 15-3.
Figure 15-4: Fan Right and Fan Left Orientations of Power Supply in a Chassis