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Intel ATX12V manual

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Table of contents for the manual

  • Page 1

    ATX12V Powe r Supply Design Guide Version 2.0[...]

  • Page 2

    ATX 12V Power Supply D esign Guide Version 2.0 2 IMPORT A NT INFORM A TION AND DIS CLA IMERS INTEL CORPORATION (AND ANY CONTRIBUTOR) IS PROVIDING THIS INFORMATION AS A CONVENIENCE A ND ACCORDINGLY MA KES NO W ARRANTIES W ITH REGARD TO T HIS DOCUMENT OR PRODUCTS MADE IN CONFORMANCE W IT H T HIS DOCUMENT. THIS D OCUMENT IS PRO VIDED "AS IS"[...]

  • Page 3

    ATX 12V Power Supply D esign Guide Version 2.0 3 Content s 1. Introduction ....................................................................................................... 6 1.1. Scope ................................................................................................................... .................. 6 1.2. Key Changes for [...]

  • Page 4

    ATX 12V Power Supply Design Guide Version 2.0 4 3.4.3. No-load Operation ..................................................................................................... 26 3.4.4. Over-curr ent Protection ............................................................................................. 26 3.4.5. Over-tem perature Pr otection ......[...]

  • Page 5

    ATX 12V Power Supply Design Guide Version 2.0 5 Figures Figure 1. Cross Loading Graph for 250W Configuration ....................................................................... 13 Figure 2. Cross Loading Graph for 300W Configuration ....................................................................... 14 Figure 3. Cross Loading Graph for 350W[...]

  • Page 6

    ATX 12V Power Supply Design Guide Version 2.0 6 1. Introduction 1.1. Scope This document provides desig n sugg estions and referenc e specifications for a family of power supplies that c omply with the ATX Specification, Version 2.03 † for motherboards and chassis. I t includes supplementary information not expressly detailed in the ATX Specifica[...]

  • Page 7

    ATX 12V Power Supply Design Guide Version 2.0 7 1.2.3. Main Pow er Connector: The 2 x 10 main power connector has been replaced by a 2 x 12 connector. This was made to support 75 watt PCI Express*requirements. Pinout assignments are based on the SSI recommendation. With the added 12V, 5V, and 3.3V pins the need for an Aux Power connector is no long[...]

  • Page 8

    ATX 12V Power Supply Design Guide Version 2.0 8 2. Applicable Document s The following documents support this design g u ide as additional reference material. Document Title Description FCC Rules Part 15, Class B Title 47, Code of Federal Regulations, Part 15 ICES-003: 1997, Class B Interference-Causing Equipment Standard – Digital Apparatus EN 5[...]

  • Page 9

    ATX 12V Power Supply Design Guide Version 2.0 9 3. Electrical The electrical requirem ents that foll ow are to be met over t he environmental ranges specified in Section 5 unless otherwise noted. 3.1. A C Input Table 1 lists AC input voltage and frequency requirements for continuous operation. The power supply shall be capable of supplying full-rat[...]

  • Page 10

    ATX 12V Power Supply Design Guide Version 2.0 10 3.1.3. Input Under-vol tage The power supply shall contain protection circuitry such that the application of an input voltage below the minimum specified in Section 3.1, Table 1, shall not cause damag e to the power supply . 3.1.4. Regulatory The power supply is required to be tested and comply with [...]

  • Page 11

    ATX 12V Power Supply Design Guide Version 2.0 11 3.1.5. Catastr ophic Fail ure Protecti on Should a component failure occur, the power supply should not ex hibit any of the following: • Flame • Excessive smoke • Charred PC B • Fused PCB conductor • Startling noise • Emission of molten material 3.2. DC Output 3.2.1. DC Voltage Regulation[...]

  • Page 12

    ATX 12V Power Supply Design Guide Version 2.0 12 3.2.2. 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 vol[...]

  • Page 13

    ATX 12V Power Supply Design Guide Version 2.0 13 3.2.3.1. A TX12V Configurations Table 3. Ty pical Pow e r Distribution for a 250 W A TX12V Configurat ion Output Min. Current (amps) Max. Current (amps) Peak Current (amps) +12 V1DC 1 8 10 +12 V2DC 1 14 +5 VDC 0.3 18 +3.3 VDC 0.5 17 -12 VDC 0 0.3 +5 VSB 0 2 2.5 Note : Total combine d output of 3.3 V [...]

  • Page 14

    ATX 12V Power Supply Design Guide Version 2.0 14 Table 4. Ty pical Pow e r Distribution for a 300 W A TX12V Configurat ion Output Min. Current (amps) Max. Current (amps) Peak Current (amps) +12 V1DC 1.0 8.0 10.0 +12 V2DC 1.0 14.0 +5 VDC 0.3 20.0 +3.3 VDC 0.5 20.0 -12 VDC 0.0 0.3 +5 VSB 0.0 2.0 2.5 Note : Total combine d output of 3.3 V and 5 V is P[...]

  • Page 15

    ATX 12V Power Supply Design Guide Version 2.0 15 Table 5. Ty pical Pow e r Distribution for a 350 W A TX12V Configuration Output Min. Current (amps) Max. Current (amps) Peak Current (amps) +12 V1DC 1 10 12 +12 V2DC 1 15 +5 VDC 0.3 21 +3.3 VDC 0.5 22 -12 VDC 0.0 0.3 +5 VSB 0.0 2.0 2.5 Note : Total combine d output of 3.3 V and 5 V is Peak cur rents [...]

  • Page 16

    ATX 12V Power Supply Design Guide Version 2.0 16 Table 6. Ty pical Pow e r Distribution for a 400 W A TX12V Configuration Output Min. Current (amps) Max. Current (amps) Peak Current (amps) +12 V1DC 1 14 16 +12 V2DC 1 15 +5 VDC 0.3 28 +3.3 VDC 0.5 30 -12 VDC 0 0.3 +5 VSB 0 2 2.5 Note : Total combine d output of 3.3 V and 5 V is Peak cur rents may la[...]

  • Page 17

    ATX 12V Power Supply Design Guide Version 2.0 17 3.2.4. Pow er Li mit / Haz ardous Ener gy Levels Under normal or overload conditions, no output shall continuously provide 240 VA under any conditions of load including output short circuit, per the requirement of UL 1950/CSA 950 / EN 60950/I EC 950. 3.2.5. Efficiency 3.2.5.1. General The power suppl[...]

  • Page 18

    ATX 12V Power Supply Design Guide Version 2.0 18 Table 8. Loading Table for Efficiency Measurements 250W (loading shown in Amps) Loading +12V1 +12V2 +5V +3.3V -12V +5Vsb Full 4 11.5 6.8 6.5 0.3 1.0 Typical 3 5 3 4 0.1 1.0 Light 2 2.4 0.3 0.5 0.0 1.0 300W (loading shown in Amps) Loading +12V1 +12V2 +5V +3.3V -12V +5Vsb Full 7 12 8 7.5 0.2 1.0 Typica[...]

  • Page 19

    ATX 12V Power Supply Design Guide Version 2.0 19 3.2.5.2. Energy Star* The “ Energy St ar ” efficiency requirements of the power supply depend on the intended sy stem configuration. In the low-power / sleep state (S1 or S3) the sy stem should consume power in accordance with the val ues listed in Table 9. Table 9. Energy Star Input Pow e r Cons[...]

  • Page 20

    ATX 12V Power Supply Design Guide Version 2.0 20 Table 10. DC Output Noise/Ripple Output Max. Ripple & Noise (mV pp ) +12 V1DC 120 +12 V2DC 200 +5 VDC 50 +3.3 VDC 50 -12 VDC 120 +5 VSB 50 Scope L oad V out V return Power Supply AC Hot AC Neutra l AC G round Sco p e N o te : Us e Tektron ix TDS 460 Osc i llos cope or equival ent and a P60 46 pr [...]

  • Page 21

    ATX 12V Power Supply Design Guide Version 2.0 21 3.2.7. Output Transient Response Table 11 summarizes the ex pected output t ransient step sizes for each output . The transient load slew rate is = 1.0 A/µ s. Table 11. DC Output Transient Step Sizes Output Max. step size (% of rated output amps per Sec 3.2.3) (1) Max. step size (amps) +12 V1DC 40% [...]

  • Page 22

    ATX 12V Power Supply Design Guide Version 2.0 22 3.2.9. Cl osed-loop Stabil ity The power supply shall be unconditionally stable under all line/load/transient load conditions including capacitive loads specified in Section 3.2.8. A minimum of 45 degr ees phase marg in and 10 dB g ain margin is re commended at both the maximum and minimum loads. 3.2[...]

  • Page 23

    ATX 12V Power Supply Design Guide Version 2.0 23 3.3.1. PWR_OK PWR_OK is a “ power good ” signal. I t should be asserted high by the power supply to indicate that the +12 VDC, +5VDC, and +3.3VDC outputs are above the under-voltage thresholds listed in Section 3.2.1 and that sufficient mains energy is stored by the converter to guarantee continu[...]

  • Page 24

    ATX 12V Power Supply Design Guide Version 2.0 24 Table 14. PS_ON# Signal Characterist ics Min. Max. V IL , Input Low Voltage 0.0 V 0.8 V I IL , Input Low Current (Vin = 0.4 V) -1.6 mA V IH , Input High Voltage (Iin = -200 µA) 2.0 V V IH open circuit, Iin = 0 5.25 V Enab le Dis abl e PS_ON# Vol tage 0. 8 2. 0 5. 25 = Maximu m Open- Cir cu i t Vo lt[...]

  • Page 25

    ATX 12V Power Supply Design Guide Version 2.0 25 3.3.4. Pow er-on Time The power-on time is define d as the time from when PS_ON# is pulled low to whe n the +12 VDC, +5 VDC, and +3.3 VDC outputs are within the regulation ranges specified in Section 3.2.1. The power-on time shall be less than 500 ms (T 1 < 500 ms). +5 VSB shall have a power-on ti[...]

  • Page 26

    ATX 12V Power Supply Design Guide Version 2.0 26 3.4. Output Protection 3.4.1. Over-v oltage Protection The over-voltage sense circuitry and reference shall reside in packages that are separate and distinct from the regulator control circuitry and reference. No single point fault shall be able to cause a sustained over-voltage condition on any or a[...]

  • Page 27

    ATX 12V Power Supply Design Guide Version 2.0 27 3.4.5. Over-temperature Protection The power supply may include an over-temperature protection sensor, which can trip and shut down the power supply at a preset temperature point. Such an overheated condition is ty pically the result of internal current overloading or a cooling fan failure. If the pr[...]

  • Page 28

    ATX 12V Power Supply Design Guide Version 2.0 28 4. Mechanical 4.1. Labeling / Marking The following is a non-inclusive list of sugg ested markings for each power supply unit. Product regulation stipulations for sale into various ge ographies may impose additional labeling requirements. • Manufacturer information: manufacturer ’ s name, part nu[...]

  • Page 29

    ATX 12V Power Supply Design Guide Version 2.0 29 . 3. T olerances: X +/- 1 X.X +/- 0.5 4. If a wire grill is required for acoustics or thermals, the grill and screws must be flush mounted. Air inlet grill, 55% open area. Optional air inlet area. Optional air inlet area. 53 REF WIRE HARNESS 16 REF 150 REF 20.0 (2X) 4.0X6 (2X) 146.0 140 REF No . 6-32[...]

  • Page 30

    ATX 12V Power Supply Design Guide Version 2.0 30 . 53 REF WIRE HARNESS 16 REF 150 REF 20.0 (2X) 4.0X6 94.0 11.0 x 5.0 cutouts (4X); min 6.0 clearance under cutout from inside top cov er. See Note 5. Area on top surf ace inside dotted lines should hav e 60% minimum open area f or proper venting. Eight rectangular holes are f or air duct mounting to [...]

  • Page 31

    ATX 12V Power Supply Design Guide Version 2.0 31 4.3. A irflow / Fan The ATX Specification allows for numer ous (and often confusing) possibilities for power supply fan location, direction, speed, and venting. The designer ’ s choice of a power supply cooling solution depends in part on the targeted end-use sy stem application(s). At a minimum, t[...]

  • Page 32

    ATX 12V Power Supply Design Guide Version 2.0 32 The ATX Specification offers two options for venting between the power supply and the sy stem interior: • The venting shown in Figure 8 provides the most effective channeled airflow for the power supply itself, with little regard for directly cooling any sy stem components. This venting method is n[...]

  • Page 33

    ATX 12V Power Supply Design Guide Version 2.0 33 Figure 10. A TX12V Pow er Supply Connectors (Pin-side view, not to scale) 1 1 +3.3 +3.3 +3.3 - 12V CO CO +5V PS_O CO CO +5V CO CO CO PWR_ N +5V +5V +12V +5V +12V +5V +3.3 V CO Main Power Connector 1 13 +3.3V +3.3V +3.3V - 12V COM COM +5V PS_ON# COM COM +5V COM COM COM PWR_ON NC +5VSB +5V +12V1 +5V +1[...]

  • Page 34

    ATX 12V Power Supply Design Guide Version 2.0 34 4.5.1. A TX M ain Pow er Connector Connector: MOLEX* h ousing: 24 Pin M olex M ini-F it Jr. PN# 39-01-2240 o r equivalent (Mating motherboard connector is Molex 44206-0007 or equiv alent) 18 AW G is suggested for all wires except for the +3.3 V sense return w ire, pin 11 (22 AW G). For 300 W configur[...]

  • Page 35

    ATX 12V Power Supply Design Guide Version 2.0 35 4.5.2. +12 V Pow er Connector Connector: MO LEX 39-01-2040 or equivalent (Mating motherboard connector is M olex 39-29-9042 or equivalent) Pin Signal 18 AWG Wire Pin Signal 18 AWG Wire 1 CO M Black 3 +12V2DC Yellow /Black Stripe 2 CO M Black 4 +12V2DC Yellow / Black Stripe 4.5.3. Peripheral Connector[...]

  • Page 36

    ATX 12V Power Supply Design Guide Version 2.0 36 4.5.4. Serial A TA Pow er Connector This is a required connector for sy stems with Serial ATA devices. The detailed requirements for the Serial ATA Power Connector can be found in the “ Seria l ATA: High Speed Serialized AT Attachment ” specification, Section 6.3 “ Cables and connector specific[...]

  • Page 37

    ATX 12V Power Supply D esign Guide Version 2.0 37 5. Environment al The following subsections define recommended environmental specifications and test parameters, based on the ty pical conditions to which an ATX12V power supply may be subjected during operation or shipment. 5.1. Temperature Operating ambient +10 ° C to +50 ° C (At full load, with[...]

  • Page 38

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 38 5.5. Mechanical Shock Non-operating 50 g , trapez oidal input; velocity change ≥ 170 in/s Three drops on each of six faces are applied to each sample. 5.6. Random Vibration Non-operating 0.01 g ² /Hz at 5 Hz, sloping to 0.02 g ² /Hz at 20 Hz, and maintaining 0.02 g ² /Hz from [...]

  • Page 39

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 39 6. Electromagnetic Comp atibility The following subsections outline sample product regulations requirements for a ty pical power supply . Actual requirements will depend on the design, product end use, target geog raphy , and other variables. Consult your company ’ s Product Safe[...]

  • Page 40

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 40 6.3. Input Line Current Harmonic Content and Line Flicker For sales in EU (European Union) or Japan the power supply shall meet the requirements of EN61000-3-2 Class D and the Guidelines for the Suppression of Harmonics in Appliances and General Use Equipment Class D for harmonic l[...]

  • Page 41

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 41 7. Reliability 7.1. Component De-rating The de-rating process promotes quality and high reliability. All electronic components should be designed with conservative device de-ratings for use in commercial and industrial environments .[...]

  • Page 42

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 42 8. Safety The following subsections outline sample product regulations requirements for a ty pical power supply . Actual requirements will depend on the design, product end use, target geog raphy , and other variables. Consult your company ’ s Product Safety and Regulations depar[...]

  • Page 43

    ATX 12V Power Supply D esign Guide Version 2.0 Final Review Copy 43 8.2. International The vendor must provide a complete CB certificate and test report to I EC 60950: 3rd ed., 1999. The CB report must include AL L CB member country national deviations. CB report must include evaluation to EN 60950: 2000. All evaluations and certifications must be [...]