ATX12V电源设计指南(pdf 43页)

1. Introduction …………......................... 6
1.1. Scope ……………………....6
1.2. Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply......................6
1.2.1. Increased +12 VDC output capability …………......................6
1.2.2. Minimum Efficiency…………......................6
1.2.3. Main Power Connector: …………...............7
1.2.4. Separate current limit for 12V2 on the 2x2 connector: ...............................................7
1.3 Terminology…………..............................................7
2. Applicable Documents …………....... 8
3. Electrical ………….............................. 9
3.1. AC Input…………………….9
3.1.1. Input Over-current Protection …………......9
3.1.2. Inrush Current Limiting …………................9
3.1.3. Input Under-voltage ………….....................10
3.1.4. Regulatory…………....................................10
3.1.5. 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…………................22
3.3. Timing / Housekeeping / Control …………..............22
3.3.1. PWR_OK………….....................................23
3.3.2. PS_ON#………….......23
3.3.3. +5 VSB…………........24
3.3.4. Power-on Time …………............................25
3.3.5. Risetime…………......25
3.3.6. Overshoot at Turn-on / Turn-off…………...25
3.3.7. Reset after Shutdown …………..................25
3.3.8. +5 VSB at AC Power-down…………..........25
3.4. Output Protection…………...............26
3.4.1. Over-voltage Protection …………...............26
3.4.2. Short-circuit Protection …………................26
3.4.3. No-load Operation ………….......................26
3.4.4. Over-current Protection …………...............26
3.4.5. Over-temperature Protection ………….......27
3.4.6. Output Bypass …………....................27
4. Mechanical…………............. 28
4.1. Labeling / Marking …………....................................28
4.2. Physical Dimensions …………................................28
4.3. Airflow / Fan…………...........31
4.4. AC Connector …………...........32
4.5. DC Connectors…………..............32
4.5.1. ATX Main Power Connector …………........34
4.5.2. +12 V Power Connector…………...............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
6.4. Magnetic Leakage Fields…………..........................40
7. Reliability …………............................. 41
7.1. Component De-rating …………...............................41
8. Safety …………................................... 42
8.1. North America …………......42
8.2. International………….....................43
8.3. Proscribed Materials…………..43
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 Configuration ………….....................15
Figure 4. Cross Loading Graph for 400W Configuration ………….....................16
Figure 5. Differential Noise Test Setup…………...................20
Figure 6. Power Supply Timing…………...............................22
Figure 7. PS_ON# Signal Characteristics…………...............24
Figure 8. Power Supply Dimensions for Chassis That Does Not Require Top Venting .......................29
Figure 9. Power Supply Dimensions for Chassis That Require Top Venting.......................30
Figure 10. ATX12V Power Supply Connectors………….......33
Figure 11. Serial 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. Minimum Efficiency Vs Load………….....................17
Table 8. Loading Table for Efficiency Measurements………….........................18
Table 9. Energy Star Input Power Consumption………….....19
Table 10. DC Output Noise/Ripple…………..........................20
Table 11. DC Output Transient Step Sizes………….............21
Table 12. Output Capacitive Loads………….........................21
Table 13. PWR_OK Signal Characteristics …………............23
Table 14. PS_ON# Signal Characteristics …………..............24
Table 15. Overvoltage Protection …………...........................26
Table 16. Harmonic Limits, Class D Equipment ………….....40
..............................

上一篇：汽车马达知识讲座(ppt 45页)

下一篇：ANSYS使用问答精华(pdf 35页)

散粮运输及装卸工艺课件(PPT 80页)

精装修工艺工法培训课件(DOCX 55页)

硅酸盐水泥熟料的煅烧工艺课件(PPT 49页)

盘套类零件加工工艺培训课件(ppt 45页)

FPC制程中常见不良因素(doc 28页)

拉挤成型工艺特点概述(PPT 55页)