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Intel ATX12V, Design Manual

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ATX12V 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) 

 

L12V1  +12V2 

+5V 

+3.3V 

-12V 

+5Vsb 

Full 7 12  8  7.5  0.2  1.0 

Typical 4 

8 

3 

4 

0.1 

1.0 

Light 2  2  0.5  1.5  0.0 

1.0 

350W (loading shown in Amps) 

 

L12V1  +12V2 

+5V 

+3.3V 

-12V 

+5Vsb 

Full 10 13  9  10  0.3 

1.0 

Typical 5 

9 

3 

5 

0.1 

1.0 

Light 3  3  1.0  2.0  0.0 

1.0 

400W (loading shown in Amps) 

 

L12V1  +12V2 

+5V 

+3.3V 

-12V 

+5Vsb 

Full 12 14  9  11  0.3 

1.0 

Typical 5 

9 

3 

5 

0.1 

1.0 

Light 3  3  1 

3 

0.0 

1.0 

 

Summary of Contents for ATX12V

Page 1: ...ATX12V Power Supply Design Guide Version 2 0 ...

Page 2: ...Y FOR INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS RELATING TO THE INFORMATION OR THE IMPLEMENTATION OF INFORMATION IN THIS DOCUMENT INTEL DOES NOT WARRANT OR REPRESENT THAT SUCH DEVICES OR IMPLEMENTATION WILL NOT INFRINGE SUCH RIGHTS INTEL IS NOT OBLIGATED TO PROVIDE ANY SUPPORT INSTALLATION OR OTHER ASSISTANCE WITH REGARD TO THE INFORMATION OR PRODUCTS MADE IN ACCORDANCE WITH IT THE INFORMAT...

Page 3: ... 5 Catastrophic Failure Protection 11 3 2 DC Output 11 3 2 1 DC Voltage Regulation 11 3 2 2 Remote Sensing 12 3 2 3 Typical Power Distribution 12 3 2 4 Power Limit Hazardous Energy Levels 17 3 2 5 Efficiency 17 3 2 6 Output Ripple Noise 19 3 2 7 Output Transient Response 21 3 2 8 Capacitive Load 21 3 2 9 Closed loop Stability 22 3 2 10 5 VDC 3 3 VDC Power Sequencing 22 3 2 11 Voltage Hold up Time ...

Page 4: ...r 35 4 5 3 Peripheral Connector s 35 4 5 4 Serial ATA Power Connector 36 4 5 5 Floppy Drive Connector 36 5 Environmental 37 5 1 Temperature 37 5 2 Thermal Shock Shipping 37 5 3 Humidity 37 5 4 Altitude 37 5 5 Mechanical Shock 38 5 6 Random Vibration 38 5 7 Acoustics 38 6 Electromagnetic Compatibility 39 6 1 Emissions 39 6 2 Immunity 39 6 3 Input Line Current Harmonic Content and Line Flicker 40 6 ...

Page 5: ...ial ATA Connector 36 Tables Table 1 AC Input Line Requirements 9 Table 2 DC Output Voltage Regulation 11 Table 3 Typical Power Distribution for a 250 W ATX12V Configuration 13 Table 4 Typical Power Distribution for a 300 W ATX12V Configuration 14 Table 5 Typical Power Distribution for a 350 W ATX12V Configuration 15 Table 6 Typical Power Distribution for a 400 W ATX12V Configuration 16 Table 7 Min...

Page 6: ... application that is for desktop workstation or server intended ambient environment temperature line voltage or motherboard power requirements 1 2 Key Changes for ATX12V Version 2 0 as Compared with ATX Power Supply 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 fo...

Page 7: ...ption Required The status given to items within this design guide which are required to meet design guide and a large majority of system applications Recommended The status given to items within this design guide which are not required to meet design guide however are required by many system applications Optional The status given to items within this design guide which are not required to meet des...

Page 8: ...Limits and methods of measurement CISPR 22 1997 Class B Information Technology Equipment Radio disturbance characteristics Limits and methods of measurement AS NZS 3548 1995 Class B Information Technology Equipment Radio disturbance characteristics Limits and methods of measurement EN 55024 1998 Information Technology Equipment Immunity Characteristics Limits and methods of measurement IEC 60950 3...

Page 9: ... 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 3 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 ...

Page 10: ...include all national deviations EU Low Voltage Directive 73 23 EEC CE Compliance GB4943 90 CCIB China ELECTROMAGNETIC CAMPATIBILITY FCC Class B Part 15 Radiated Conducted Emissions CISPR 22 EN55022 3rd Edition Radiated Conducted Emissions 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 Electr...

Page 11: ...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 5 Table 2 DC Output Voltage Regulation Output Range Min Nom Max Unit 12V1DC 5 11 40 12 00 12 60 Volts 12V2DC 1 5 11 40 12 00 12 60 Volts 5VDC 5 4 75 5 00 5 25 Volts 3 3VDC 2...

Page 12: ...on specific system options and implementation Significant dependencies include the quantity and types of processors memory add in card slots and peripheral bays as well as support for advanced graphics or other features It is ultimately the responsibility of the designer to derive a power budget for a given target product and market Table 3 through Table 5 and Figure 1 through Figure 3 provide sam...

Page 13: ... VDC 0 0 3 5 VSB 0 2 2 5 Note Total combined output of 3 3 V and 5 V is Peak currents may last up to 17 seconds with not more than one occurrence per minute 12V1DC and 12V2DC should have separate current limit circuits to meet 240VA safety requirements 250W Cross Regulation 5V rail 3 3V rail vs 12V 0 20 40 60 80 100 120 0 50 100 150 200 250 12V power watts 5V 3 3V power watts Combined Power 5V rai...

Page 14: ...Note Total combined output of 3 3 V and 5 V is Peak currents may last up to 17 seconds with not more than one occurrence per minute 12V1DC and 12V2DC should have separate current limit circuits to meet 240VA safety requirements 300W Cross Regulation 5V rail 3 3V rail vs 12V1 12V2 0 20 40 60 80 100 120 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 12V power watts 5V 3 3V pow er w atts Combi...

Page 15: ... 2 5 Note Total combined output of 3 3 V and 5 V is Peak currents may last up to 17 seconds with not more than one occurrence per minute 12V1DC and 12V2DC should have separate current limit circuits to meet 240VA safety requirements 350W Cross Regulation 5V rail 3 3V rail vs 12V1 12V2 0 20 40 60 80 100 120 140 0 50 100 150 200 250 300 350 12V power watts 5V 3 3V power watts Combined Power 5V rail ...

Page 16: ...Note Total combined output of 3 3 V and 5 V is Peak currents may last up to 17 seconds with not more than one occurrence per minute 12V1DC and 12V2DC should have separate current limit circuits to meet 240VA safety requirements 400W Cross Regulation 5V rail 3 3V rail vs 12V1 12V2 0 20 40 60 80 100 120 140 0 50 100 150 200 250 300 350 400 12V power watts 5V 3 3V power watts Combined Power 5V rail 3...

Page 17: ...pical load and 60 in a light load or idle condition The efficiency of the power supply should be tested at nominal input voltage of 115VAC input and or 230VAC input under the load conditions defined in Table 7 and Table 8 and under the temperature and operating conditions defined in Section 5 The loading condition for testing efficiency shown in Table 8 represents a fully loaded system a 50 typica...

Page 18: ... 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 Typical 4 8 3 4 0 1 1 0 Light 2 2 0 5 1 5 0 0 1 0 350W loading shown in Amps Loading 12V1 12V2 5V 3 3V 12V 5Vsb Full 10 13 9 10 0 3 1 0 Typical 5 9 3 5 0 1 1 0 Light 3 3 1 0 2 0 0 0 1 0 400W loading shown in Amps Loading 12V1 12V2 5V 3 3V 12V 5Vsb Full 12 14 9 11 0 3 1 0 Typical 5 9 3 5 0 1 1 0...

Page 19: ... some general guidance Requirements will vary with geographic region and target end user market To help meet the Blue Angel RAL UZ 78 US Presidential executive order 13221 future EPA requirements and other low Power system requirements the 5 VSB standby supply should be as efficient as possible Standby efficiency is measured with the main outputs off PS_ON high state Standby efficiency should be g...

Page 20: ... Note Use Tektronix TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent Filter Note 0 1uf Kemet C1206C104K5RAC or equivalent 10uf United Chemi con 293D106X0025D2T or equivalent General Notes 1 Load the output with its minimum load current 2 Connect the probes as shown 3 Repeat the measurement with maximum load on the output Load must be isolated from the ground of the power supply 0 ...

Page 21: ...ply should be stable when subjected to load transients per Table 11 from any steady state load including any or all of the following conditions Simultaneous load steps on the 12 VDC 5 VDC and 3 3 VDC outputs all steps occurring in the same direction Load changing repetition rate of 50 Hz to 10 kHz AC input range per Section 3 1 Capacitive loading per Table 12 3 2 8 Capacitive Load The power supply...

Page 22: ... operation The time between the 12 VDC or 5 VDC output reaching its minimum in regulation level and 3 3 VDC reaching its minimum in regulation level must be 20 ms 3 2 11 Voltage Hold up Time The power supply should maintain output regulation per Section 3 2 1 despite a loss of input power at the low end nominal range 115 VAC 57 Hz or 230 VAC 47 Hz at maximum continuous output load as applicable fo...

Page 23: ...g 200 µA High state output impedance 1 kΩ from output to common PWR_OK delay 100 ms T3 500 ms PWR_OK risetime T4 10 ms AC loss to PWR_OK hold up time T5 16 ms Power down warning T6 1 ms 3 3 2 PS_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 pu...

Page 24: ... for circuits that must remain operational when the five main DC output rails are in a disabled state Example uses include soft power control Wake on LAN wake on modem intrusion detection or suspend state activities The 5 VSB output should be capable of delivering a minimum of 2 0 A at 5 V 5 to external circuits The power supply must be able to provide the required power during a wake up event If ...

Page 25: ...he 10 to 90 risetime waveform a straight line drawn between the end points of the waveform segment must have a slope Vout nominal 20 V ms 3 3 6 Overshoot at Turn on Turn off The output voltage overshoot upon the application or removal of the input voltage or the assertion deassertion of PS_ON under the conditions specified in Section 3 1 shall be less than 10 above the nominal voltage No voltage o...

Page 26: ...ts between main output rails and 5 VSB shall not cause any damage to the power supply The power supply shall either shut down and latch off or fold back for shorting the negative rails 5 VSB must be capable of being shorted indefinitely but when the short is removed the power supply shall recover automatically or by cycling PS_ON The power supply shall be capable of withstanding a continuous short...

Page 27: ...eset temperature point Such an overheated condition is typically the result of internal current overloading or a cooling fan failure If the protection circuit is nonlatching then it should have hysteresis built in to avoid intermittent tripping 3 4 6 Output Bypass The output return may be connected to the power supply chassis The return will be connected to the system chassis by the system compone...

Page 28: ... etc in human readable text and or bar code formats Nominal AC input operating voltages 100 127 VAC and 200 240 VAC and current rating certified by all applicable safety agencies Section 8 DC output voltages and current ratings Access warning text Do not remove this cover Trained service personnel only No user serviceable components inside in English German Spanish French Chinese and Japanese with...

Page 29: ...onal air inlet area 53 REF WIRE HARNESS 16 REF 150 REF 20 0 2X 4 0X6 2X 146 0 140 REF No 6 32 UNC 2B THREADED HOLE 4X 138 0 86 REF 74 0 6 0 114 0 64 0 16 0 6 0 2X Notes unless otherwise specified 1 Dimensions are in mm 2 Drawing is not to scale See Note 4 psu_grills Preferred locations of manufacturer label Figure 8 Power Supply Dimensions for Chassis That Does Not Require Top Venting Second optio...

Page 30: ...cs or thermals the grill and screws must be flush mounted 5 Bottom side not pictured may be user accessible in final system installation Cover openings as necessary to prevent access to non SELV circuitry and to meet product safety requirements No 6 32 UNC 2B THREADED HOLE 4X Notes unless otherwise specified 1 Dimensions are in mm 2 Drawing is not to scale 64 0 16 0 6 0 2X 114 0 See Note 4 9 0 x 3...

Page 31: ...d acoustic performance The circuit typically senses the temperature of an internal heatsink and or incoming ambient air and adjusts the fan speed as necessary to keep power supply and system component temperatures within specification 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 ...

Page 32: ...le may be considered the mains disconnect 4 5 DC Connectors Figure 10 shows pinouts and profiles for typical ATX power supply DC harness connectors Listed or recognized component appliance wiring material AVLV2 CN rated min 85 C 300 VDC shall be used for all output wiring There are no specific requirements for output wire harness lengths as these are largely a function of the intended end use chas...

Page 33: ...ly 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 3V 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 12V1 5V 3 3V COM Main Power Connector ...

Page 34: ...in 11 22 AWG For 300 W configurations 16 AWG is recommended for all 12 VDC 5 VDC 3 3 VDC and COM Pin Signal Color Pin Signal Color 1 3 3VDC Orange 13 13 3 3VDC 3 3 V default sense Orange Brown 2 3 3VDC Orange 14 12VDC Blue 3 COM Black 15 COM Black 4 5VDC Red 16 PS_ON Green 5 COM Black 17 COM Black 6 5VDC Red 18 COM Black 7 COM Black 19 COM Black 8 PWR_OK Gray 20 Reserved N C 9 5VSB Purple 21 5VDC ...

Page 35: ...lex 39 29 9042 or equivalent Pin Signal 18 AWG Wire Pin Signal 18 AWG Wire 1 COM Black 3 12V2DC Yellow Black Stripe 2 COM Black 4 12V2DC Yellow Black Stripe 4 5 3 Peripheral Connector s Connector AMP 1 480424 0 or MOLEX 8981 04P or equivalent Contacts AMP 61314 1 or equivalent Pin Signal 18 AWG Wire 1 12V1DC Yellow 2 COM Black 3 COM Black 4 5VDC Red ...

Page 36: ... in the Serial ATA High Speed Serialized AT Attachment specification Section 6 3 Cables and connector specification http www serialata org Wire Signal 18 AWG Wire 5 3 3 VDC Orange 4 COM Black 3 5 VDC Red 2 COM Black 1 12 V1DC Yellow Figure 11 Serial ATA Connector 4 5 5 Floppy Drive Connector Connector AMP 171822 4 or equivalent Pin Signal 20 AWG Wire 1 5VDC Red 2 COM Black 3 COM Black 4 12V1DC Yel...

Page 37: ... C 10 minutes but no more than 10 C hr Non operating ambient 40 C to 70 C Maximum temperature rate of change of 20 C hr 5 2 Thermal Shock Shipping Non operating 40 C to 70 C 15 C min dT dt 30 C min Tested for 50 cycles Duration of exposure to temperature extremes for each half cycle shall be 30 minutes 5 3 Humidity Operating To 85 relative humidity non condensing Non operating To 95 relative humid...

Page 38: ... general guidance Guidelines Sound Power The power supply assembly shall not produce a declared sound power level greater than 4 0 BA Sound power determination is to be performed at 43C 50 of maximum rated load at sea level This test point is chosen to represent the environment seen inside a typical system at the idle acoustic test condition with the 43C being derived from the standard ambient ass...

Page 39: ...lations department for more details 6 1 Emissions The power supply shall comply with FCC Part 15 EN55022 1998 and CISPR 22 1997 meeting Class B for both conducted and radiated emissions with a 4 dB margin Tests shall be conducted using a shielded DC output cable to a shielded load The load shall be adjusted as follows for three tests No load on each output 50 load on each output 100 load on each o...

Page 40: ...l rated power See Table 16 for the harmonic limits Table 16 Harmonic Limits Class D Equipment Per EN 61000 3 2 Per JEIDA MITI Harmonic Order n Maximum permissible Harmonic current at 230 VAC 50 Hz in Amps Maximum permissible Harmonic current at 100VAC 50 Hz in Amps Odd harmonics 3 5 7 9 11 13 15 n 39 2 3 1 14 0 77 0 4 0 33 0 21 0 15 x 15 n 5 29 2 622 1 771 0 92 0 759 0 483 0 345 x 15 n 6 4 Magneti...

Page 41: ...inal 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: ... circuit current and maximum VA output and abnormal testing to include stalled fan tests and voltage select switch mismatch The enclosure must meet fire enclosure mechanical test requirements per clauses 2 9 1 and 4 2 of the above mentioned standard Production hi pot testing must be included as a part of the certification and indicated as such in the certification report There must not be unusual ...

Page 43: ...try national deviations CB report must include evaluation to EN 60950 2000 All evaluations and certifications must be for reinforced insulation between primary and secondary circuits 8 3 Proscribed Materials Cadmium should not be used in painting or plating No quaternary salt electrolytic capacitors shall be used Mercury shall not be used The use of CFCs or HFCs shall not be used in the design or ...

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