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Page 12 Intel ATX Power Supply Design Guide Version 0.9 Table 6: Typical Power Distribution for a 250 W Configuration Min. Max. Peak Notes: Current Current Current Requires the 1x6 auxiliary power connector to carry Output (amps) (amps) (amps) the 3.3 V & 5 V currents to the PCB. +12VDC 0.0 10.0 12.0 +5VDC 1.0 25.0 +3.3VDC and +5VDC combined power 145 W Max +3.3VDC 0.3 16.0 Pin 11 default +3.3 V sense required -5VDC 0.0 0.3 -12VDC 0.0 0.8 +5VSB 0.0 0.72 See Section 3.4.3. Table 7: Typical Power Distribution for a 300 W Configuration Min. Max. Peak Notes: Current Current Current Requires the 1x6 auxiliary power connector to carry Output (amps) (amps) (amps) the 3.3 V & 5 V currents to the PCB. +12VDC 0.0 10.0 12.0 +5VDC 1.0 30.0 +3.3VDC and +5VDC combined power 220 W Max +3.3VDC 0.3 28.0 Pin 11 default +3.3 V sense required -5VDC 0.0 0.3 -12VDC 0.0 0.8 +5VSB 0.0 0.72 See Section 3.4.3. 3.3.1 Power Limit Under short circuit or overload conditions, no output shall exceed 240 VA under any conditions including single component fault conditions. 3.3.2 Efficiency The efficiency of the power supply should be met over the AC input range defined in Table 1, under the load conditions defined in Section 3.3, and under the temperature and operating conditions defined in Section 5. The power supply should be a minimum of 68% efficient under maximum load as defined in the applicable configuration. The “Energy Star” efficiency of the power supply should be a minimum of 56%. In the Energy Star state, the AC input power is limited to 15% of rated output power for the configuration. For example, in a 200 W configuration, the Energy Star input power limit is 200 W . 0.15 = 30 W. In a 300 W configuration, the Energy Star input power is limited to 300 W . 0.15 = 45 W. The +5VSB standby supply efficiency should be 50% at 500 mA output. Standby efficiency is measured with the main outputs off and with PS_ON# high. The AC input power shall not exceed 5 W when the main outputs are in the “DC disabled” state with 500 mA load on +5VSB and the input is 230 VAC/50 Hz. Page 13 Intel ATX Power Supply Design Guide Version 0.9 3.3.3 Output Ripple/Noise The following output ripple/noise requirements should be met throughout the load ranges specified in Section 3.3, 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 .F ceramic disk capacitor and a 10 .F electrolytic capacitor to simulate system loading. Table 8: DC Output Noise/Ripple Output Max Ripple & Noise (mVpp) +12VDC 120 +5VDC 50 +3.3VDC 50 -5VDC 100 -12VDC 120 +5VSB 50 3.3.4 Output Transient Response The +3.3VDC and +5VDC outputs will see transients up to 30% of the rated output current (e.g., for a rated +5VDC output of 18 A, the transient step would be 0.3 . 18 A = 5.4 A). The +12VDC output will see transients up to 50% of the rated output current. The transient slew rate will be 2.5 A/.s. The power supply should be stable under all transient conditions from any steady state load, and the over/undershoot should be within the regulation band stated in Section 3.2.1. 3.3.5 Capacitive Load The power supply should be able to power up and operate normally with the following capacitances simultaneously present on the DC outputs. Output: +12VDC +5VDC +3.3VDC -5VDC -12VDC +5VSB Capacitive load (mF): 1,000 10,000 6,000 350 350 350 3.3.6 Closed Loop Stability The power supply shall be unconditionally stable under all line/load/transient load conditions including capacitive loads specified in Section 3.3.5. A minimum of 45 degrees phase and 10 dB-gain margin is required. The power supply vendor shall provide proof of the unit’s closed-loop stability with local sensing through the submission of Bode plots. Closed-loop stability must be ensured at the maximum and minimum loads as applicable. Page 14 Intel ATX Power Supply Design Guide Version 0.9 3.3.7 +5VDC/+3.3VDC Power Sequencing The +5VDC output level must be equal to or greater than the +3.3VDC output at all times during power-up and normal operation. The time between the +5VDC output reaching its minimum in-regulation level and +3.3VDC reaching its minimum in-regulation level must be less than or equal to 20 ms. 3.3.8 Voltage Hold-up Time The power supply shall maintain output regulation per Section 3.2.1 despite a loss of input power at the low-end nominal range (Low = 115 VAC, 57 Hz or 230 VAC, 47 Hz) at maximum continuous output load as applicable for a minimum of 17 ms. Page 15 Intel ATX Power Supply Design Guide Version 0.9 3.4 Timing / Housekeeping / Control Off PS_ON# On 95% +5VDC/+3.3VDC O/P 10% PWR_OK ~ ~ ~ T2 T3 T5 T4 PWR_OK Sense Level = 95% of nominal Figure 1: Power Supply Timing Notes: T2 is defined in Section 3.4.5. T3, T4, and T5 are defined in Table 9. 3.4.1 PWR_OK PWR_OK is a “power...
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