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. | |||||
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+12VDC | 0.0 | 10.0 | 12.0 |
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+5VDC | 1.0 | 25.0 |
| +3.3VDC and +5VDC combined power 145 W Max | |
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+3.3VDC | 0.3 | 16.0 |
| Pin 11 default +3.3 V sense required | |
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0.0 | 0.3 |
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0.0 | 0.8 |
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+5VSB | 0.0 | 0.72 |
| See Section 3.4.3. | |
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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. | |||||
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+12VDC | 0.0 | 10.0 | 12.0 |
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+5VDC | 1.0 | 30.0 |
| +3.3VDC and +5VDC combined power 220 W Max | |
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+3.3VDC | 0.3 | 28.0 |
| Pin 11 default +3.3 V sense required | |
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0.0 | 0.3 |
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0.0 | 0.8 |
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+5VSB | 0.0 | 0.72 |
| See Section 3.4.3. | |
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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.
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