Intel TFX12V manual Pson#, Pwrok Signal Characteristics

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TFX12V Power Supply Design Guide

Thin Form Factor with 12 V Connector

Version 2.0

2.3.1PWR_OK

PWR_OK is a “power good” signal. This signal should be asserted high by the power supply to indicate that the +12 VDC, +5 VDC, and +3.3 VDC outputs are above the under voltage thresholds listed in Table 2 in Section 2.2.1 and that sufficient mains energy is stored by the converter to guarantee continuous power operation within specification for at least the duration specified in Section 2.2.12, “Voltage Hold-up Time.” Conversely, PWR_OK should be de-asserted to a low state when any of the +12 VDC, +5 VDC, or +3.3 VDC output voltages falls below its under voltage threshold, or when mains power has been removed for a time sufficiently long such that power supply operation cannot be guaranteed beyond the power-down warning time. The electrical and timing characteristics of the PWR_OK signal are given in Table 13 and in Figure 7.

Table 13. PWR_OK Signal Characteristics

Signal Type

Logic level low

Logic level high

High-state output impedance

PWR_OK delay

PWR_OK rise time

AC loss to PWR_OK hold-up time

Power-down warning

+5 V TTL compatible

< 0.4 V while sinking 4 mA

Between 2.4 V and 5 V output while sourcing 200 µA

1 kΩ from output to common

100 ms < T3 < 500 ms

T4 ≤ 10 ms

T5 ≥ 16 ms

T6 ≥ 1 ms

2.3.2PS_ON#

PS_ON# is an active-low, TTL-compatible signal that allows a motherboard to remotely control the power supply in conjunction with features such as soft on/off, Wake on LAN*, or wake-on-modem. When PS_ON# is pulled to TTL low, the power supply should turn on the four main DC output rails: +12 VDC, +5 VDC, +3.3 VDC, and -12 VDC. When PS_ON# is pulled to TTL high or open-circuited, the DC output rails should not deliver current and should be held at zero potential with respect to ground. PS_ON# has no effect on the +5 VSB output, which is always enabled whenever the AC power is present. Table 14 lists PS_ON# signal characteristics.

The power supply shall provide an internal pull-up to TTL high. The power supply shall also provide de- bounce circuitry on PS_ON# to prevent it from oscillating on/off at startup when activated by a mechanical switch. The DC output enable circuitry must be SELV-compliant.

The power supply shall not latch into a shutdown state when PS_ON# is driven active by pulses between 10ms to 100ms during the decay of the power rails.

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Contents Thin Form Factor with 12-Volt Connector TFX12VImportant Information and Disclaimers Revision History Version Release DateContents Mechanical Figures TFX12V Overview IntroductionTFX12V Scope Small System Optimized ProfileKey Changes for TFX12V Version Term Required Recommended Optional TerminologyMonotonically Noise Description Input Over Current Protection ElectricalAC Input Inrush Current LimitingProduct Safety RegulatoryDC Voltage Regulation DC OutputCatastrophic Failure Protection Remote SensingTypical Power Distribution Typical Power Distribution for 180 W TFX12V ConfigurationsTypical Power Distribution for 220 W TFX12V Configurations Cross Loading Graph for 220W ConfigurationTypical Power Distribution for 240 W TFX12V Configurations Cross Loading Graph for 240W ConfigurationTypical Power Distribution for 270 W SFX12V Configurations Power Limit / Hazardous Energy LevelsEfficiency General Efficiency Vs Load Loading Table for Efficiency MeasurementsOutput Ripple/Noise Other Low Power System RequirementsEnergy Star Input Power Consumption DC Output Noise/RippleOutput Transient Response Maximum Step Size AmpsClosed-loop Stability 11 +5 VDC / +3.3 VDC Power SequencingCapacitive Load Voltage Hold-up TimePower Supply Timing Timing / Housekeeping / ControlPwrok Pwrok Signal CharacteristicsPSON# PSON# Signal Characteristics Power-on Time3 +5 VSB Output Protection No-load Operation Over-temperature ProtectionShort-circuit Protection Over Current ProtectionMechanical Physical DimensionsLabeling /Marking Page Power Supply Mounting Slot Detail Mounting Options Chassis Requirements Suggested TFX12V Chassis CutoutAC Connector Airflow / FanDC Connectors TFX12V Connectors Pin-side view, not to scalePeripheral Connectors 1 TFX12V Main Power ConnectorFloppy Drive Connector 4 +12 V Power Connector Serial ATA Power ConnectorEnvironmental Acoustics Random VibrationEcological Requirements North America SafetyInternational Emissions Electromagnetic CompatibilityImmunity Voltage Fluctuations and Flicker Input Line Current Harmonic ContentMagnetic Leakage Fields Harmonic Limits, Class D EquipmentReliability System Cooling ConsiderationsApplicable Documents

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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