User manual ENHANCE SFX V2_2

[. . . ] SFX/SFX12V Power Supply Design Guide Version 2. 2 Document Revision Version Release Date 1. 0 1. 1 12/97 4/98 Notes Public release · · · Updated all mechanical outlines to clean up dimensioning of mounting holes. Added chassis cutouts for all mechanical outlines to clarify keep-out areas. Added Appendix C. Added SFX12V description Additional power ratings added Updated industry standards Increased standby current Section 4. 4 Updated Figure 4 SFX/SFX12V Connectors Section 5. 8 removed vendor name 2. 0 5/01 · · · · 2. 1 8/01 · · 2. 2 12/05 · · Section 3. 23 Typical Power Distribution. Add text "The power supply should 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. " SFX/SFX12V Power Supply Design Guide Version 2. 2 IMPORTANT INFORMATION AND DISCLAIMERS 1. [. . . ] In the low-power / sleep state (S1 or S3) the system should consume power in accordance with the values listed in Table 8. Page 13 SFX/SFX12V Power Supply Design Guide Version 2. 2 Table 8 Energy Star Input Power Consumption Maximum Continuous Power Rating of Power Supply < 200 W > 200 W < 300 W > 300 W < 350 W > 350 W < 400 W > 400 W RMS Watts from the AC line in sleep/low-power mode < 15 W < 20 W < 25 W < 30 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 > 50% efficiency at light load and in standby mode. Blue Angel, RAL-UZ 78 To help meet the Blue Angel 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). To meet Blue Angel system requirements, the AC input power shall not exceed 5 W when the main outputs are in the "DC disabled" state with 500 mA load on +5 VSB and a 230 VAC / 50 Hz input. 3. 2. 6. Output Ripple/Noise The output ripple/noise requirements listed in Table 9 should be met throughout the load ranges specified in Section 3. 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 bandwidth. Outputs should be bypassed at the connector with a 0. 1 µF ceramic disk capacitor and a 10 µF electrolytic capacitor to simulate system loading. DC Output Noise/Ripple Output +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB Maximum Ripple and Noise (mVpp) 120 50 50 120 50 Page 14 SFX/SFX12V Power Supply Design Guide Version 2. 2 Power Supply AC Hot AC Neutral V out Load V return 10uf 0. 1uf Load must be isolated from the ground of the power supply. AC Ground General Notes: 1. Repeat the measurement with maximum load on the output. Scope Filter Note: 0. 1uf - Kemet, C1206C104K5RAC or equivalent 10uf - United Chemi-con, 293D106X0025D2T or equivalent Scope Note: Use Tektronix TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent. Figure 1. Output Transient Response Table 10 summarizes the expected output transient step sizes for each output. DC Output Transient Step Sizes Output Maximum step size (% of rated output amps per Sec 3. 2. 3) (Note) 50% 30% 30% 0. 1 A 0. 5 A Maximum. step size (amps) +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB Note: For example, for a rated +5 VDC output of 14 A, the transient step would be 30% × 14 A = 4. 2 A Page 15 SFX/SFX12V Power Supply Design Guide Version 2. 2 Output voltages should remain within the regulation limits of Table 2, Section 3. 2. 1 for instantaneous changes in load as specified in Table 10 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 · Capacitive loading per Table 11 3. 2. 8. Capacitive Load The power supply should be able to power up and operate with the regulation limits defined in Table 2, Section 3. 2. 1 with the following capacitances simultaneously present on the DC outputs. Output Capacitive Loads Output +12 VDC +5 VDC +3. 3 VDC -12 VDC +5 VSB Capacitive load (µF) 5, 000 10, 000 6, 000 350 350 3. 2. 9. Closed-loop Stability 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 degrees phase margin and 10 dB gain margin is recommended at both the maximum and minimum loads. 3. 2. 10. +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 inregulation 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 for a minimum of 17 ms. Page 16 SFX/SFX12V Power Supply Design Guide Version 2. 2 3. 3. 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 of Section 3. 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 3. 2. 11, "Voltage Hold-up Time. " Conversely, PWR_OK should be deasserted 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 12 and in Figure 2. Page 17 SFX/SFX12V Power Supply Design Guide Version 2. 2 Table 12. [. . . ] Flush mount screws if necessary 8. 5 46. 0 38. 0 4. 0 135° x 4 R5 25. 3 29. 8 34. 3 4. 0 14. 5 88. 0 96. 0 Figure 6 Chassis Cutout Page 33 SFX/SFX12V Power Supply Design Guide Version 2. 2 APPENDIX B GUIDELINES FOR A TOP MOUNT FAN PACKAGE B. 1 OVERVIEW For applications requiring greater airflow directed 90° to the power supply top cover, such as a microATX or mini-tower chassis, the power supply PCB could be repackaged in an enclosure with an 80 mm fan mounted to the top cover. This would provide greater flow of cooling air with better directed cooling. This power supply would differ only in the mechanical outline specifications. B. 2 PHYSICAL DIMENSIONS The supply shall be enclosed and meet the physical outline shown in Figure 7. B. 3 FAN REQUIREMENTS The fan will draw air from the computer system cavity pressurizing the power supply enclosure. The power supply enclosure shall exhaust the air through a grill located on the rear panel. [. . . ]