Intel TFX12V Power Supply User Manual
Contents
1. 14 Typical Power Distribution for 240 W TFX12V 15 Typical Power Distribution for 270 W SFX12V Configurations 16 Efficieney 17 Loading Table for Efficiency Measurement 17 Energy Star Input Power 5 18 DG Output Noise Fipple 18 DC Output Transient Step 965 19 5 e 20 PWR OK Signal 1 5 22 PS_ON Signal Characteristics cmd ieee 23 Over Voltage Polection ean 25 Harmonic Limits Class D EQuIpMON 39 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 1 Introduction 1 1 TFX12V Scope This document provides design suggestions for a small form factor power supply that is primarily intended for use with small form factor system designs 9 15 liters in total system volume It should not be inferred that all Thin Fo2. ean HG ene ee 37 ended 37 6 Electromagnetic Compatibility cccccccsssssseeeeeeeeeeeeeeeeeeeeeseeneeeeeeeeeeeeeeees 38 Gelli cad cee corte arcsec ane ea eae 38 6 2 IMMUN cect os tert 38 6 3 Input Line Current Harmonic Content eccceeseee cece eeeeeeeeeeeeeeeeeeeaaeeeeeeeeneenaeeeeeeees 39 6 4 Magnetic Leakage FicldS2 c 4 ae eee eee ee 39 6 5 Voltage Fluctuations and aiciee ees en are ee ene eee 39 System Cooling nnna 40 Reliability s 40 9 Applicable Documents 40 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 TEX12V Power SUpDpIY N 7 Cross Loading Graph for 180W
3. 13 Cross Loading Graph for 220W 14 Cross Loading Graph for 240W 15 Cross Loading Graph for 270W 16 Differential Noise Test SOtup cciciccce coeccceexseectsccdcin sicdeseeseeniin cadeeet anand ieeeennneeede 19 Power TUNG 21 PS_ON Signal 23 Power Supply Dimensions and Recommended Feature Placements scale 27 Power Supply Mounting Slot Detail 28 Fan Right and Fan Left Orientations of Power Supply a Chassis 29 Suggested TFX12V Chassis bade ee areal 30 Suggested Mounting Tab chassis feature 30 TFX12V Connectors Pin side view scale 32 Serial ATA Connector 34 AC Input Line Requirements 10 DC Output Voltage 12 Typical Power Distribution for 180 W TFX12V 13 Typical Power Distribution for 220 W TFX12V
4. Signal Type 5V TIL compatible Logic level low lt 0 4 V while sinking 4 mA Logic level high Between 2 4 V and 5 V output while sourcing 200 pA High state output impedance 1 from output to common PWR_OK delay 100 ms lt T lt 500 ms PWR_OK rise time lt 10 ms loss to PWR_OK hold up time 216 ms Power down warning T 21ms 2 3 2 PS 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 5_ is pulled to TTL high 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 22 TFX12V Power Su
5. AC Ground 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 Filter Note 0 1uf Kemet C1206C104K5RAC or equivalent 10uf United Chemi con 293D106X0025D2T or equivalent Scope Scope Note Use Tektronixt TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent Figure 6 Differential Noise Test Setup Table 11 summarizes the expected output transient step sizes for each output The transient load slew rate is 1 0 A us Table 11 DC Output Transient Step Sizes Maximum Step Size Maximum Step Size Output of rated output amps amps 12 40 12 V2DC 60 5 VDC 30 3 3 VDC 30 12 VDC 0 1A 5 VSB 0 5A Note For example for rated 5 VDC output of 14 A the transient step would be 30 14 4 2 Output voltages should remain within the regulation limits of Table 2 Section 2 2 1 for instantaneous changes in load as specified in Table 11 and for 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 and Capacitive loading per Table 12 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 2 9 Capacitive Load The powe
6. 12 Thin Form Factor with 12 Volt Connector Power Supply Design Guide Version 2 0 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 IMPORTANT INFORMATION AND DISCLAIMERS INTEL CORPORATION AND ANY CONTRIBUTOR IS PROVIDING THIS INFORMATION AS A CONVENIENCE AND ACCORDINGLY MAKES NO WARRANTIES WITH REGARD TO THIS DOCUMENT OR PRODUCTS MADE IN CONFORMANCE WITH THIS DOCUMENT THIS DOCUMENT IS PROVIDED AS IS AND INTEL DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE IN ADDITION INTEL AND ANY CONTRIBUTOR DOES NOT WARRANT OR REPRESENT THAT THIS DOCUMENT OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL OPERATE IN THE INTENDED MANNER ARE FREE FROM ERRORS OR DEFECTS OR ARE SAFE FOR USE FOR ITS INTENDED PURPOSE ANY PERSON USING THIS DOCUMENT OR MAKING USING OR SELLING PRODUCTS IN CONFORMANCE WITH THIS DOCUMENT DOES SO AT HIS OR HER OWN RISK INTEL DISCLAIMS ALL LIABILITY ARISING FROM OR RELATED TO USE OR IMPLEMENTATION OF THE INFORMATION PROVIDED IN THIS DOCUMENT INCLUDING LIABILITY 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 INFO
7. Immunity EN 61000 4 4 Electrical Fast Transients EN 61000 4 5 Electrical Surge EN 61000 4 6 RF Conducted EN 61000 4 8 Power Frequency Magnetic Fields EN 61000 4 11 Voltage Dips Short Interrupts and Fluctuations EN61000 3 2 Harmonics EN61000 3 3 Voltage Flicker EU EMC Directive 8 9 336 EEC CE Compliance 2 1 4 3 Other Certifications and or Declarations GB925 CNS13438 Taiwan BSMI AS NZ3548 Australia C tick based on CISPR22 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 1 5 Catastrophic Failure Protection Should a component failure occur the power supply should not exhibit any of the following e Flame e Excessive smoke e Charred PCB e Fused PCB conductor e Startling noise e Emission of molten material e Earth ground fault short circuit to ground or chassis enclosure 2 2 DC Output 2 2 1 DC Voltage Regulation The DC output voltages shall remain within the regulation ranges shown in Table 2 when measured at the load end of 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 4 Table 2 DC Output Voltage Regulation Output Minimum Nominal Maximum Unit 12 V1DC 5 11 40 12 00 12 60 Volts 12 V2DC No
8. 3 4 Chassis Requirements To ensure the power supply can be easily integrated the following features should be designed into a chassis intended to use a TFX12V power supply e Chassis cutout normally in the rear panel of the chassis as shown in Figure 12 e EITHER a mounting bracket to interface with the forward mounting hole on the power supply OR a mounting tab as shown in Figure 13 to interface with the mounting slot on the bottom of the power supply R4 X3 0 Figure 12 Suggested TFX12V Chassis Cutout 5 X4 RI X2 Figure 13 Suggested Mounting Tab chassis feature 30 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
9. a 9 RAE EE 10 2 1 AC Input 10 2 1 1 Input Over Current PrOleChonsacus te ee 10 2 1 2 Inrush Current Limiting dicts 10 2 1 3 Input Und r Voltage ten eae ens 10 2 1 4 Regulatory ey ey ee 11 2 1 5 Catastrophic Failure Protection 12 2 2 12 2 2 1 DC Voltage Regulation i 12 2 2 2 Remote ee ea etna eee 12 2 2 3 Typical Power 5 13 2 2 4 Power Limit Hazardous Energy 16 2 2 5 Efficiency General 16 2 2 6 Other Low Power System 18 2 2 7 Output Ripple Noise mene eee ase eee 18 2 2 8 Output Transient RESPONSE 19 2 2 9 Capacitive Load 20 2 2 10 Closed loop 20 2 2 11 5 VDC 3 3 VDC Power Sequencing 20 2 2 12 Voltage Hold up need doeanctneedeneetaedes 20 2 3 Timi
10. 3 3 29 3 4 Chassis MOQUINCING IS 30 Aiow Fa cated seated etapa ames eee 31 3 62 31 COMMOCIONS 32 3 7 1 TFX12V Main Power As 33 3 7 2 Peripheral Connector S 33 3 7 3 Floppy ated 33 3 7 4 12 V Power o a el 34 3 7 5 Serial ATA POwerConneGtor 34 4 CENVIFONMEGN al ie eee ee 35 4 1 Temperature ANE EREE 35 4 2 Thermal Shock Shipping 35 4 3 Relative dey ane sae 35 4 4 Altitude Reguirem nti OS 35 4 5 Mecha nical SROCK srein eae EE E a a 35 4 6 Random Vibration ARE EERE n 36 apace bre Bers Ae A 36 4 8 Ecological Requirements 5 36 TO LU 37 5 1
11. Added loading tables for efficiency measurement points Minor modifications to Energy Star Updated power and current guidance Updated cross regulation graphs Updated load tables Updated required efficiency targets Added recommended efficiency targets Increased required minimum efficiency at typical and light load Required Serial ATA connector Added Terminology section Main Power Connector changes to 2x12 Separate current limit on 2x2 connector for 12V2 rail 12V2 requirements added TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Contents 1 Introduction asssiisdcceiececcassoiaderviniecenpiscsccasserescaehotaceassysacaisiovetenvessaccassonseecenerecaats 7 Tel ac ett aed ee ee 7 12 2 eet unas 7 1 2 1 Small System Optimized 7 1 2 2 Improved ACOUSTICS 2 ea edt eta aura ee tae edt elena 8 1 3 Key Changes for TFX12V Version 2 0 8 1 3 1 Increased 12 VDC Output 8 1 3 2 Minimum i sh odes a heheh 8 1 3 3 8 1 3 4 Separate Current Limit for 12V2 on the 2x2 8 TA
12. 1 4 2 4 3 4 4 4 5 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Environmental The following subsections define recommended environmental specifications and test parameters based on the typical conditions a TFX12V power supply unit may be subjected to during operation or shipment Temperature Operating ambient 10 C to 50 C At full load with a maximum temperature rate of change of 5 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 Thermal Shock Shipping Non operating 40 C to 70 C 15 C min lt Dt dt lt 30 C min Tested for 50 cycles Duration of exposure to temperature extremes for each half cycle shall be 30 minutes Relative Humidity Operating To 85 relative humidity non condensing Non operating To 95 relative humidity non condensing Note 95 RH is achieved with a dry bulb temperature of 55 C and a wet bulb temperature of 54 C Altitude Requirement Operating To 10 000 ft Non operating To 50 000 ft Mechanical Shock Non operating 50 g trapezoidal input velocity change 170 in s Three drops on each of six faces are applied to each sample 35 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 4 6 4 7 4 8 Random Vibration Non operating 0 01 g Hz at 5 Hz sloping to 0 02 g Hz at 20
13. Note 3 3 VDC 0 5 16 7 Note 12 VDC 0 0 0 3 5 VSB 0 0 2 0 2 5 Note Total combined output of 3 3 V and 5 V is lt 63 W Peak currents may last up to 17 seconds with not more than one occurrence per minute 180W Cross Regulation 5V rail 3 3V rail vs 12V 70 2 60 oO 50 5 40 Combined Power 239 5V rail 3 3V rail amp 20 gt 10 0 0 50 100 150 200 12 power watts Figure 2 Cross Loading Graph for 180W Configuration 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Table 4 Typical Power Distribution for 220 W TFX12V Configurations Minimum Current Rated Current Peak Current Output amps amps amps 12 VDC 1 0 15 0 7 5 VDC 0 3 13 0 Note 3 3 VDC 0 5 17 0 Note 12 VDC 0 0 0 3 5 VSB 0 0 2 0 2 5 Note Total combined output of 3 3 V and 5 V is lt 80 W Peak currents may last up to 17 seconds with not more than one occurrence per minute 220W Cross Regulation 5V rail 3 3V rail vs 12V 90 gt 80 wn 70 x60 50 2 40 Combined Power 5V rail 3 3V rail gt 30 20 z 10 100 12V power watts 200 Figure 3 Cross Loading Graph for 2
14. Title 47 Code of Federal Regulations Part 15 Interference Causing Equipment Standard Digital Apparatus Information Technology Equipment Radio disturbance characteristics Limits and methods of measurement CISPR 22 1997 Class B AS NZS 3548 1995 Class B EN 55024 1998 Information Technology Equipment Radio disturbance characteristics Limits and methods of measurement Information Technology Equipment Radio disturbance characteristics Limits and methods of measurement Information Technology Equipment Immunity Characteristics Limits and methods of measurement IEC 60950 3 ed 1999 Safety of Information Technology Equipment EN 60950 2000 Safety of Information Technology Equipment UL 60950 3 ed 2000 Safety of Information Technology Equipment CSA 22 2 No 60950 00 Safety of Information Technology Equipment 40
15. 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 previou
16. defined as the time from when PS_ON is pulled low to when the 12 VDC 5 VDC and 3 3 VDC outputs are within the regulation ranges specified in Section 2 2 1 The power on time shall be less than 500 ms T lt 500 ms 5 VSB shall have a power on time of two seconds maximum after application of valid AC voltages TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 3 5 Rise Time The output voltages shall rise from lt 10 of nominal to within the regulation ranges specified in Section 2 2 1 within 0 2 ms to 20 ms 0 2 ms lt lt 20 ms There must be a smooth and continuous ramp of each DC output voltage from 10 to 90 of its final set point within the regulation band while loaded as specified in Section 2 2 1 The smooth turn on requires that during the 10 to 90 portion of the rise time the slope of the turn on waveform must be positive and have a value of between 0 V ms and Vour nominal 0 1 V ms Also for any 5 ms segment of the 10 to 90 rise time waveform a straight line drawn between the end points of the waveform segment must have a slope 2 Vout nominal 201 V ms 2 3 6 Overshoot at Turn on Turn off The output voltage overshoot upon the application or removal of the input voltage or the assertion de assertion of PS_ON under the conditions specified in Section 3 1 shall be less than 10 above the nominal voltage No voltage of opposite polarity shall be present on any ou
17. 20W Configuration 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Table 5 Typical Power Distribution for 240 W TFX12V Configurations Minimum Current Rated Current Peak Current Output amps amps amps 12 VDC 1 0 16 0 18 0 5 VDC 0 3 18 0 Note 3 3 VDC 0 5 17 0 Note 12 VDC 0 0 0 3 5 VSB 0 0 20 2 5 Note Total combined output of 3 3 V and 5 V is lt 115 W Peak currents may last up to 17 seconds with not more than one occurrence per minute 240W Cross Regulation 5V rail 3 3V rail vs 12V ak Combined Power A 5V rail 3 3V rail 5V 3 3V power watts 0 50 100 12 power watts 150 200 Version 2 0 Figure 4 Cross Loading Graph for 240W Configuration 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Table 6 Typical Power Distribution for 270 W SFX12V Configurations Output Minimum Maximum Peak Current Current Current amps amps amps 12 1 0 7 0 9 0 12 V2DC 1 0 13 0 5 VDC 0 3 18 0 3 3 VDC 0 5 17 0 12 VDC 0 0 0 3 5 VSB 0 0 2 0 2 5 Note Total combined output of 3 3 V and 5 V is lt 120 W Peak currents may last up to 17 seconds with not more than one occurrence per minute 270W Cross Regulation 5V rail 3 3V rail vs 12V1 12
18. AC Input Table 1 lists AC input voltage and frequency requirements for continuous operation The power supply shall be capable of supplying full rated output power over two input voltage ranges rated 100 127 VAC and 200 240 VAC rms nominal The correct input range for use in a given environment may be either switch selectable or auto ranging The power supply shall automatically recover from AC power loss The power supply must be able to start up under peak loading at 90 VAC Table 1 AC Input Line Requirements Parameter Minimum Nominal Maximum Unit V 115 VAC 90 115 135 VAC V 230 VAC 180 230 265 VAC s V Frequency 47 63 Hz Note Nominal voltages for test purposes are considered to be within 1 0 V of nominal 2 1 1 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 slow blow type or equivalent to prevent nuisance trips 2 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 to three line cycles shall be limited to a level below the surge rating of the input line cord AC switch if present bridge rectifier fuse and EMI filter components Repetitive ON OFF cycling of the AC input voltage should not damage the power supply or cause the input fuse to bl
19. D HOLE X2 DETAIL VENT DETAIL SCALE 2 500 SEE DETAIL VENT DETAIL No 6 32 UNC 2B THREADED HOLE 3X 14 5 15 REF Rear View Bottom View 85 Preferred Location of Manufacturers Label Right Side View Figure 9 Power Supply Dimensions and Recommended Feature Placements not to scale 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 8 d 3253 14 02 PSU BOTTOM WALL ia Figure 10 Power Supply Mounting Slot Detail 28 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 3 3 Mounting Options 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 11 A mounting hole and slot should be provided for each orientation as shown in Figure 9 Details of a suggested geometry for the mounting slot are shown in Figure 10 Figure 11 Fan Right and Fan Left Orientations of Power Supply a Chassis 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0
20. Hz and maintaining 0 02 g Hz from 20 Hz to 500 Hz The area under the PSD curve is 3 13 gRMS The duration shall be 10 minutes per axis for all three axes on all samples Acoustics Sound Power The power supply assembly shall not produce a declared sound power level greater than 3 8 BA Sound power determination is to be performed at 43C 50 of 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 assumption of 23C with 20C added for the temperature rise within the system what is typically seen by the inlet fan The declared sound power level shall be measured according to ISO 7779 and reported according to ISO 9296 Pure Tones The power supply assembly shall not produce any prominent discrete tone determined according to ISO 7779 Annex D Ecological Requirements The following materials must not be used during design and or manufacturing of this product e Cadmium shall be used in painting or plating e Quaternary salt PCB electrolytic capacitors shall not be used e CFC s or HFC s shall not be used in the design or manufacturing process e Mercury shall not be used 36 5 1 5 2 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Safety The following subsections outline sample product regulations requirements for a typical p
21. RMATION OR PRODUCTS MADE IN ACCORDANCE WITH IT THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE THE INFORMATION REFERRED TO IN THIS DOCUMENT IS INTENDED FOR STANDARD COMMERCIAL USE ONLY CUSTOMERS ARE SOLELY RESPONSIBLE FOR ASSESSING THE SUITABILITY OF THE INFORMATION FOR USE IN PARTICULAR APPLICATIONS THE INFORMATION IS NOT INTENDED FOR USE IN CRITICAL CONTROL OR SAFETY SYSTEMS MEDICAL OR LIFE SAVING APPLICATIONS OR IN NUCLEAR FACILITY APPLICATIONS NO LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED HEREIN Intel and Pentium are registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries Copyright 2003 2004 Intel Corporation All rights reserved Other names and brands may be claimed as the property of others Revision History Version Release Date 1 0 1 01 1 2 2 0 April 2002 May 2002 April 2003 February 2004 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Notes Public release Added dimension in Figure 5 to clarify location of mounting slot feature Updated power and current guidance Added efficiency targets for light and nominal loading Increased minimum Efficiency at full load from 68 to 70 Updated guidance for standby efficiency Added Serial ATA connector Updated Revision history table Reformat title page Added cross loading tables
22. T5 lt 1 l D 1 PS_ON 12VDC as fd eee oa ae 5VDC home es ek LI ee 7 1 T3 lt a3 PWR_OK gt lt Te PWR_OK Sense Level 95 of nominal timing_3_5_12b Figure 7 Power Supply Timing Notes T1 is defined in Section 2 3 4 T2 in Section 2 3 5 T3 T4 T5 and T6 are defined in Table 13 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 31 PWR_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
23. V2 _ Combined Power 5V rail 3 3V rail 5V 3 3V power watts 0 0 40 80 120 160 200 240 12 power watts Figure 5 Cross Loading Graph for 270W Configuration 2 2 4 Power Limit Hazardous Energy 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 60950 IEC 950 specification 2 2 5 Efficiency General The power supply should be a minimum of 70 efficient under Full load 70 under typical load and 60 in a light load idle condition The efficiency of the power supply should be tested at nominal input voltage of 115VAC input and 230VAC input under the load conditions defined Table 8 and under the temperature and TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 operating conditions defined in Section 3 The loading condition for testing efficiency shown in Table 7 represents fully loaded system a typical 50 loaded system a light 20 loaded system Table 7 Efficiency Vs Load Loading Full load Typical load Light load Required Minimum Efficiency 70 70 60 Recommended Minimum Ef
24. akage Fields A PFC choke magnetic leakage field should not cause any interference with a high resolution computer monitor placed next to or on top of the end use chassis 6 5 Voltage Fluctuations and Flicker The power supply shall meet the specified limits of the EN61000 3 3 Specification for voltage fluctuations and flicker for equipment drawing not more then16 AAC connected to low voltage distribution systems 39 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 7 System Cooli ng Considerations The power supply fan location allows the system designer to utilize the airflow to help cool critical components such as the processor and chipset Please note that the fan pulls air from the system instead of blowing hot air in so components must be placed such that airflow is directed across critical components Cables etc must not impede airflow For more information on system thermal design please refer to http www formfactors org 8 Reliability The de rating process promotes quality and high reliability All electronic components should be designed with conservative device d ratin gs for use in commercial and industrial environments 9 Applicable Documents The following documents support this design guide as additional reference material Document Title FCC Rules Part 15 Class B ICES 003 1997 Class B EN 55022 1998 Amendment A1 2000 Class B Description
25. cation mark shall be marked on each power supply The power supply must be evaluated for operator accessible secondary outputs reinforced insulation that meet the requirements for SELV and do not exceed 240 VA under any condition of loading The proper polarity between the AC input receptacle and any printed wiring boards connections must be maintained that is brown line blue neutral and green or green yellow earth chassis Failure of any single component in the fan speed control circuit shall not cause the internal component temperatures to exceed the abnormal fault condition temperatures per the IEC 60950 3rd ed 1999 Specification International The vendor must provide a complete CB certificate and test report to IEC 60950 3rd ed 1999 The CB report must include ALL CB member country 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 37 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Electromagnetic Compatibility 6 1 6 2 The following subsections outline applicable product regulatory requirements for the TFX12V power supply Additional requirements may be applied dependent upon the design product end use e g medical equipment and hazardous locations target geography and other variables Emissions The power supply shall comply with FCC Par
26. ficiency 75 80 68 Table 8 Loading Table for Efficiency Measurements 180W loading shown in Amps Loading 12V 5V 3 3V 12V 5Vsb Full 11 4 5 8 0 3 1 0 Typical 7 3 4 0 1 1 0 Light 2 0 3 0 5 0 0 1 0 220W loading shown in Amps Loading 12V 5V 3 3V 12V 5Vsb Full 13 5 9 0 3 1 0 Typical 8 3 5 0 1 1 0 Light 3 0 5 2 0 0 0 1 0 240W loading shown in Amps Loading 12V 5V 3 3V 12V 5Vsb Full 14 5 7 7 0 2 1 0 Typical 7 4 5 0 1 1 0 Light 3 4 1 0 3 0 0 0 1 0 270W loading shown in Amps Loading 12V1 12V2 5V 3 3V 12V 5Vsb Full 4 11 5 9 4 9 0 2 1 0 Typical 2 5 5 4 5 4 0 1 1 0 Light 1 2 4 0 4 0 7 0 0 1 0 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 2 51 Energy Star The Energy Star efficiency requirements of the power supply depend on the intended system configuration In the low power sleep state S1 or S3 the system should consume power in accordance with the values listed in Table 9 Table 9 Energy Star Input Power Consumption Maximum Continuous Power Rating of RMS Watts from the AC Line in Sleep low Power Power Supply Mode lt 200 W lt 15W gt 200 W lt 300 W lt 20W gt 300 W lt 350 W lt 25W gt 350 W lt 400 W lt 30W gt 400 W 10 of the maximum continuous output rating Note To help meet the Energy Star system requirements it is recommended that the power supply have gt 50 efficiency in s
27. fined as any output impedance of less than 0 1 ohms The power supply shall shut down and latch off for shorting the 3 3 VDC 5 VDC or 12 VDC rails to return or any other rail Shorts 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 circuit to the output without damage or overstress to the unit for example to components PCB traces and connectors under the input conditions specified in Section 3 1 2 4 3 No load Operation No damage or hazardous condition should occur with all the DC output connectors disconnected from the load The power supply may latch into the shutdown state 244 Over Current Protection Overload currents applied to each tested output rail cause the output to trip before reaching or exceeding 240 VA For testing purposes the overloaded currents should be ramped at a minimum rate of 10 A s starting from full load 2 4 5 Over temperature Protection As an option 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 typically the result of internal cu
28. for general use power supplies is 150 mm for all wire harnesses Measurements are made from the exit port of the power supply case to the wire side of the first connector on the harness 1 13 Pin 1 3 3VDC 3 3VDC 3 3 12VDC 3 3VDC COM 12V COM eon 5VDC SSi 5 p com 5VDC COM u COM 12VDC Peripheral Power HVDC Connector NC 5V Serial ATA 5V Connector 5V Floppy Drive Main Power Connector Power Connector 12 Power Connector Figure 14 TFX12V Connectors Pin side view not to scale 32 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 3 7 1 TFX12V Main Power Connector Connector MOLEX 39 01 2240 or equivalent Mating motherboard connector is Molex 44206 0007 or equivalent 18 AWG is suggested for all wires except for the 3 3 V supply and sense return wires combined into pin 11 22 AWG Pin Signal Color Pin Signal Color 1 3 3 VDC Orange 13 3 3 VDC Orange 13 3 3 V default Brown sense 2 3 3 VDC Orange 14 12 VDC Blue 3 COM Black 15 COM Black 4 5 VDC Red 16 PS_ON Green 5 COM Black 17 COM Black 6 5 VDC Red 18 COM Black 7 COM Black 19 COM Black 8 PWR_OK Gray 20 Reserved NC 9 5 VSB Purple 21 5 VDC Red 10 12 Yellow 22 5 VDC Red 11 12 V1DC Yellow 23 5 VDC Red 12 3 3 VDC Orange 24 COM Black 3 7 2 Periphe
29. lace The smaller systems are no longer confined to the floor or under the desk but are placed on the desktop next to the user In these situations noise becomes an important factor to the end user Thin Form Factor with 12 Volt connector TFX12V supplies should use fan speed control techniques to provide a low acoustic profile while providing ample cooling to internal components when required 1 3 Key Changes for TFX12V Version 2 0 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 for 5V as main power are no longer provided 1 3 1 Increased 12 VDC Output Capability System components that use 12V are continuing to increase in power In cases where expected current requirements is greater than 18A a second 12 V rail should be made available ATX12V power supplies should be designed to accommodate these increased 12 VDC currents 1 3 2 Minimum Efficiency Minimum measured efficiency is required to be 70 at full typical 50 load and 60 at light 20 load New recommended guidance has been added to provide direction for expected future requirements 1 3 3 Main Power Connector The 2 x 12 main power connector replaces the 2 x 10 connector This change was made to support 75 watt PCI Express requirements 1 3 4 Separate Current Limit for 12V2 on the 2x2 Connector The 12V rail on the 2 x 2 power connect
30. ng Housekeeping 21 2 3 1 PWR OK techie ah Aa 22 2 3 2 neonates ce enn neo eee eae ae one 22 29 3 5 VSB a nea 23 2 3 4 Power on ee 23 2 3 5 PRESS TUNG Sac da 24 2 3 6 Overshoot at Turn on sates ek 24 2 3 7 Reset after 24 2 3 8 5 VSB at AC Power down ai ieee 24 Protection a ena eau 24 2 4 1 Over Voltage Protection 24 2 4 2 ShOrt CirCuit Protection 25 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 4 3 No load Operati N ee 25 2 4 4 Over Current Protection a soi 25 2 4 5 Over temperature 25 2 4 6 O tput BYPASS 25 3 Mechanical ea 26 Bal Labeling MarkinNg 26 3 2 Physical DIMCNSIONS ed ee ees 26
31. or should be a separate current limited output to meet the requirements of UL and EN 60950 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 1 4 Terminology The following terms are used in this document Term Description 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 to meet design guide however some system applications may optionally use these features Ba Declared sound power LwAd The declared sound power level shall be measured according to 150 7779 for the power supply and reported according to ISO 9296 CFM Cubic Feet per Minute airflow Monotonically A waveform changes from one level to another in a steady fashion without intermediate retracement or oscillation Optional The status given to items within this design guide which are not required Noise The periodic or random signals over frequency band of 0 Hz to 20 MHz TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Electrical 2 1 The following electrical requirements must be met over the environmental ranges as defined in Section 5 unless otherwise noted
32. ow 2 1 3 Input Under Voltage The power supply shall contain protection circuitry such that the application of an input voltage below the minimum specified in Section 2 1 Table 1 shall not cause damage to the power supply 1 For Denmark and Switzerland international safety requirements if the internal over current protective devices exceed 8A for Denmark and 10A for Switzerland then the power supply must pass international safety testing to EN 60950 using a maximum 16A over current protected branch circuit and this 16A time delay fuse branch circuit protector must not open during power supply abnormal operation output short circuit and component fault testing 10 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 1 4 Regulatory The power supply is required to be tested and comply with the most current version of the following regulatory specification requirements and or standards 2 1 4 1 PRODUCT SAFETY UL 60950 3 Edition CAN CSA C22 2 60950 00 60 950 3 Edition IEC 60 950 3 Edition CB Report to include all national deviations EU Low Voltage Directive 73 23 EEC CE Compliance GB4943 90 CCIB China 2 1 4 2 ELECTROMAGNETIC CAMPATIBILITY FCC Class Part 15 Radiated amp Conducted Emissions CISPR 22 EN55022 3 Edition Radiated amp Conducted Emissions EN55024 ITE Specific Immunity EN 61000 4 2 Electrostatic Discharge 61000 4 3 Radiated
33. ower supply Actual requirements will depend on the design product end use target geography and other variables Consult your company s Product Safety and Regulations department for more details North America The power supply must be certified by an NRTL Nationally Recognized Testing Laboratory for use in the USA and Canada under the following conditions e The supply must be recognized for use in Information Technology Equipment including Electrical Business Equipment per UL 60950 3rd edition 2000 The certification must include external enclosure testing for the AC receptacle side of the power supply e supply must have full complement of tests conducted as part of the certification such as input current leakage current hi pot temperature energy discharge test transformer output characterization test open circuit voltage short circuit current and maximum VA output and abnormal testing to include stalled fan tests and voltage select switch mismatch e enclosure must meet fire enclosure mechanical test requirements per clauses 2 9 1 and 4 2 of the above mentioned standard 100 production HiPot testing must be included and marked as such on the power supply enclosure There must not be unusual or difficult conditions of acceptability such as mandatory additional cooling or power de rating The insulation system shall not have temperatures exceeding their rating when tested in the end product The certifi
34. pply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Table 14 PS_ON Signal Characteristics Parameter Minimum Maximum Vip Input Low Voltage 0 0 V 0 8 V l Input Low Current Vin 0 4 V 1 6 mA Input High Voltage lin 200 pA 2 0V open circuit lin 0 5 25 V Hysteresis 2 0 3 V Disable gt 2 0V PS is disabled lt 0 8V PS is enabled Enable 0 8 2 0 5 25 Maximum Open Circuit Voltage PS_ON Voltage Figure 8 PS_ON Signal Characteristics 2 3 3 5 VSB 5 VSB is a standby supply output that is active whenever the AC power is present This output provides a power source 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 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 an external USB device generates the event there may be peak currents as high as 2 5 A lasting no more than 500 ms Over current protection is required on the 5 VSB output regardless of the output current rating This ensures the power supply will not be damaged if external circuits draw more current than the supply can provide 2 3 4 Power on Time The power on time is
35. r supply should be able to power up and operate with the regulation limits defined in Table 2 Section 2 2 1 with the following capacitances simultaneously present on the DC outputs Table 12 Output Capacitive Loads Output Capacitive Load uF 12 5 000 12 V2DC 3 000 5 VDC 10 000 3 3 VDC 6 000 12 VDC 350 5 VSB 350 2 2 10 Closed loop Stability The power supply shall be unconditionally stable under all line load transient load conditions including capacitive loads specified in Section 2 2 9 A minimum of 45 degrees phase margin and 10 dB gain margin is recommended at both the maximum and minimum loads 2 2 11 5 VDC 3 3 VDC Power Sequencing The 12 VDC and 5 VDC output levels must be equal to or greater than the 3 3 VDC output at all times during power up and normal 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 lt 20 ms 2 2 12 Voltage Hold up Time The power supply should maintain output regulations per Section 2 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 for a minimum of 17 ms 20 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 3 Timing Housekeeping Control gt lt gt
36. ral 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 12 ViDC Yellow 2 COM Black 3 COM Black 4 5 VDC Red 3 7 3 Floppy Drive Connector Connector 171822 4 equivalent Pin Signal 20 AWG Wire 1 5 VDC Red 2 COM Black 3 COM Black 4 12 Yellow 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 3 7 4 12 V Power Connector Connector MOLEX 39 01 2040 or equivalent Mating motherboard connector is Molex 39 29 9042 or equivalent Pin Signal 18 AWG Wire Pin Signal 18 AWG Wire 1 COM Black 3 12 V2DC Yellow Black Stripe 2 COM Black 4 12 V2DC Yellow Black Stripe 3 7 5 Serial ATA Power Connector This is an optional connector for systems with Serial ATA devices The detailed requirements for the Serial ATA Power Connector can be found in the Serial ATA High Speed Serialized AT Attachment specification Section 6 3 Cables and connector specification Connector MOLEX 88751 or equivalent Wire Signal 18 AWG Wire 5 3 3 VDC Orange 4 COM Black 3 5 VDC Red 2 COM Black 1 12 ViDC Yellow Molex Housing 675820000 or equivelaph x Molex Terminal 675810000 or equivalent 5 Figure 15 Serial ATA Connector 34 4 4
37. rm Factor with 12 Volt connector TFX12V power supplies must conform exactly to the content of this document though there are key parameters that define mechanical fit across a common set of platforms Since power supply needs vary depending on system configuration the design specifics described are not intended to support all possible systems ojj 900 000000000 900000 0 Figure 1 TFX12V Power Supply 1 2 TFX12V Overview This section provides a brief overview of the unique features of the Thin Form Factor with 12 Volt connector TFX12V power supply design and a summary of the changes included in revision 1 2 1 2 1 Small System Optimized Profile The increase in demand for smaller systems results in unique system layout challenges The Thin Form Factor with 12 Volt connector TFX12V configuration has been optimized for small and low profile microATX and FlexATX system layouts The long narrow profile of the power supply shown in Figure 1 fits easily into low profile systems The fan placement can be used to efficiently exhaust air from the processor and core area of the motherboard making possible smaller more efficient systems using common industry ingredients TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 1 2 2 Improved Acoustics As desktop systems become smaller they are placed in more exposed areas in the home and work p
38. rrent overloading or a cooling fan failure If the protection circuit is non latching then it should have hysteresis built in to avoid intermittent tripping 246 Output Bypass The output return may be connected to the power supply chassis and will be connected to the system chassis by the system components TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 3 Mechanical 3 1 Labeling Marking The following is a non inclusive list of suggested markings for each power supply unit Product regulation stipulations for sale into various geographies may impose additional labeling requirements e Manufacturer information manufacturer s name part number and lot date code etc in human readable text and or bar code formats e Nominal AC input operating voltages 100 127 VAC and 200 240 VAC and current rating certified by all applicable safety agencies e DC output voltages and current ratings e Access warning text Do not remove this cover Trained service personnel only No user serviceable components inside must be in English German Spanish French Chinese and Japanese with universal warning markings 3 2 Physical Dimensions The power supply shall be enclosed and meet the physical outline shown in Figure 9 as applicable 26 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Vent pattern minimum 70 open Top View 6 32 UNC 2B THREADE
39. s venting guidelines are e Openings must be sufficiently designed to meet the safety requirements described in Section 5 e 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 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 3 7 DC Connectors Figure 14 shows pin outs and profiles for typical TFX12V power supply DC harness connectors The TFX12V requires an additional two pin power connector UL Listed or recognized component appliance wiring material 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 chassis motherboard and peripherals Ideally wires should be short to minimize electrical airflow impedance and simplify manufacturing yet they should be long enough to make all necessary connections without any wire tension which can cause disconnections during shipping and handling Recommended minimum harness lengths
40. t 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 output Tests will be performed at 100 VAC 50Hz 120 VAC 60 Hz and 230 VAC 50 Hz power Immunity The power supply shall comply with EN 55024 1998 and CISPR 24 specifications prior to sale in the EU European Union Korea and possibly other geographies 38 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 6 3 Input Line Current Harmonic Content For sales in the EU European Union 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 line current content at full 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 9 11 13 15 lt lt 39 2 3 1 14 0 77 0 4 0 33 0 21 0 15 15 5 29 2 622 1 771 0 92 0 759 0 483 0 345 15 6 4 Magnetic Le
41. tandby mode 2 2 6 Other Low Power System Requirements To help meet the Blue Angel system requirements RAL UZ 78 US Presidential executive order 13221 future EPA requirements and other low Power system requirements the 5 VSB standby supply efficiency should be as high as possible Standby efficiency is measured with the main outputs off PS_ON high state Standby efficiency should be greater than 50 with a load of 100mA 2 27 Output Ripple Noise The output ripple noise requirements listed in Table 10 should be met throughout the load ranges specified in Section 2 2 3 and under all input voltage conditions as specified in Section 3 1 Ripple and noise are defined as periodic or random signals over a frequency band of 10 Hz to 20 MHz Measurements shall be made with an oscilloscope with 20 MHz of bandwidth Outputs should be bypassed at the connector with a 0 1uF ceramic disk capacitor and a 10 electrolytic capacitor to simulate system loading See Figure 6 Table 10 DC Output Noise Ripple Maximum Ripple and Noise Output mVpp 12 120 12 V2DC 200 5 VDC 50 3 3 VDC 50 12 VDC 120 5 VSB 50 18 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 2 8 Output Transient Response Power Supply O AC Hot O AC Neutral Load must be V return 10uf 0 1 isolated from the ground of the Load power supply
42. te 5 11 40 12 00 12 60 Volts 5 VDC 5 4 75 5 00 5 25 Volts 3 3 VDC 5 3 14 3 30 3 47 Volts 12 VDC 10 10 80 12 00 13 20 Volts 5 VSB 5 4 75 5 00 5 25 Volts Note At 12 VDC peak loading regulation at the 12 VDC output can go to 10 2 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 voltages to a minimum 12 12 Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 2 2 3 Typical Power Distribution DC output power requirements and distributions will vary based 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 Table 3 through Table 6 show the power distribution and cross loading tables for power supplies in the range of 180 W to 240 W Itis ultimately the responsibility of the designer to define a power budget for a given target product and market Table 3 Typical Power Distribution for 180 W TFX12V Configurations Rated Current Minimum Current Peak Current Output amps amps amps 12VDC 1 0 13 0 15 0 5 VDC 0 3 12 0
43. tput during turn on or turn off 2 3 Reset after Shutdown If the power supply latches into a shutdown state because of a fault condition on its outputs the power supply shall return to normal operation only after the fault has been removed and the PS_ON has been cycled OFF ON with a minimum OFF time of one second 2 3 8 5 VSB at Power down After AC power is removed the 5 VSB standby voltage output should remain at its steady state value for the minimum hold up time specified in Section 2 2 12 until the output begins to decrease in voltage The decrease shall be monotonic in nature dropping to 0 0 V There shall be no other disturbances of this voltage at or following removal of AC power 2 4 Output Protection 2 41 Over Voltage 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 all outputs The supply shall provide latch mode over voltage protection as defined in Table 15 24 TFX12V Power Supply Design Guide Thin Form Factor with 12 V Connector Version 2 0 Table 15 Over Voltage Protection Output Minimum Nominal Maximum Unit 12 V1DC 13 4 15 0 15 6 Volts 12 V2DC 13 4 15 0 15 6 Volts 5 VDC 5 74 6 3 7 0 Volts 3 3 VDC 3 76 4 2 4 3 Volts 2 4 2 Short circuit Protection An output short circuit is de
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