TFX12V Power Supply Design Guide

Thin Form Factor with 12-V Connector

Version 2.0

3.5 Airflow / Fan

The designer’s choice of a power supply cooling solution depends in part on the targeted end-use system application(s). At a minimum, the power supply design must ensure its own reliable and safe operation.

Fan location/direction: In general, exhausting air from the system chassis enclosure via a power supply fan is the preferred, most common, and most widely applicable system-level airflow solution. The location of the fan can have a large effect on how efficiently this air is exhausted. The location of the fan shown in Figure 9 allows the fan to be located close to the processor cooling solution when used in the common fan left configuration shown in Figure 11. This close proximity of the fan will aid in the evacuation of heated air and helps keep the total system cooler.

Fan size/speed: The TFX12V power supply has an 80 mm axial fan as shown in Figure 9. It is recommended that a thermally sensitive fan speed control circuit be used to balance system-level thermal and acoustic performance. The circuit typically senses the temperature of the secondary heat sink and/or incoming ambient air and adjusts the fan speed as necessary to keep power supply and system component temperatures within specifications. Both the power supply and system designers should be aware of the dependencies of the power supply and system temperatures on the control circuit response curve and fan size and should specify them carefully.

The power supply fan should be turned off when PS_ON# is de-asserted (high). In this state, any remaining active power supply circuitry must rely only on passive convection for cooling.

Venting: In general, more venting in a power supply case yields reduced airflow impedance and improved cooling performance. Intake and exhaust vents should be as large, open, and unobstructed as possible so as not to impede airflow or generate excessive acoustic noise. In particular, avoid placing objects within 0.5 inches of the intake or exhaust of the fan itself. A raised wire fan grill is recommended instead of a stamped metal vent for improved airflow and reduced acoustic noise for the intake vent. Figure 9 shows the suggested TFX12V exhaust vent pattern.

Considerations to the previous venting guidelines are:

•Openings must be sufficiently designed to meet the safety requirements described in Section 5.

•Larger openings yield decreased EMI-shielding performance. The suggested pattern in Figure 9 sufficiently shields EMI in most power supplies, but the design should always be tested as outlined in Section 6.1.

NOTE:

Venting in inappropriate locations can detrimentally allow airflow to bypass those areas where it is needed.

3.6 AC Connector

The AC input receptacle should be an IEC 320 type or equivalent. In lieu of a dedicated switch, the IEC 320 receptacle may be considered the mains disconnect.

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Intel TFX12V manual Airflow / Fan, AC Connector
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TFX12V specifications

The Intel TFX12V is a power supply unit (PSU) designed specifically for compact desktop systems, catering to the needs of PC builders who prioritize space-efficient components without compromising on performance. Intel's TFX12V specification defines the form factor and power delivery standards, ensuring compatibility across a wide range of motherboards and peripherals.

One of the main features of the TFX12V is its slimline design. Measuring 85mm in height, 65mm in width, and 150mm in depth, this PSU fits into smaller case designs, making it ideal for compact desktops or media centers. Despite its small size, the TFX12V delivers robust power, typically ranging from 300W to 400W. This output is sufficient for everyday computing tasks, light gaming, and media consumption, allowing users to create space-saving systems without sacrificing functionality.

The TFX12V power supply adheres to the ATX power supply standard, featuring a 24-pin ATX connector, which ensures broad compatibility with modern motherboards. Additionally, the TFX12V includes connections for other crucial components, such as the 4-pin CPU power connector and multiple SATA and PCIe connectors, enabling the build of systems with modern graphics cards and storage solutions.

The efficiency of the TFX12V is another significant aspect. Many models are designed to meet or exceed the 80 PLUS certification, which indicates at least 80% efficiency at 20%, 50%, and 100% loads. High efficiency not only reduces energy consumption but also minimizes heat generation, leading to quieter operation due to lower fan speeds.

In terms of safety and reliability, TFX12V power supplies come equipped with standard protections against over-voltage, under-voltage, and short-circuits. These safety features safeguard the valuable components of a PC from potential power surges or failures.

Furthermore, the product lifecycle of the Intel TFX12V often ensures access to advanced technologies, including pulsating load regulation and enhanced thermal management technologies. These features contribute to a stable power output and improved performance, even under load.

In summary, the Intel TFX12V power supply unit combines compactness, efficiency, and reliability, making it an attractive choice for users looking to build a small form-factor PC without compromising on essential features or quality. With its robust performance and modern technology, it meets the demands of today's computing needs effectively.
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