ATX12V Power Supply Design Guide
Version 2.0
3.1.5. Catastrophic Failure Protection
Should a component failure occur, the power supply should not exhibit any of the following:
•Flame
•Excessive smoke
•Charred PCB
•Fused PCB conductor
•Startling noise
•Emission of molten material
3.2.DC Output
3.2.1. 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 5.
Table 2. DC Output Voltage Regulation
Output | Range | Min. | Nom. | Max. | Unit |
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+12V1DC | ±5% | +11.40 | +12.00 | +12.60 | Volts |
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+12V2DC (1) | ±5% | +11.40 | +12.00 | +12.60 | Volts |
+5VDC | ±5% | +4.75 | +5.00 | +5.25 | Volts |
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+3.3VDC (2) | ±5% | +3.14 | +3.30 | +3.47 | Volts |
±10% | Volts | ||||
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+5VSB | ±5% | +4.75 | +5.00 | +5.25 | Volts |
(1)At +12 VDC peak loading, regulation at the +12 VDC output can go to ± 10%.
(2)Voltage tolerance is required at main connector and
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