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Intel ATX Power Supply Design Guide
Version 0.9
Page 11
3.1.5 Catastrophic Failure Protection
The primary circuit design and the components specified in the same should be such that,
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.
3.2 DC Output Requirements
3.2.1 DC Voltage Regulation
The DC output voltages shall remain within the regulation ranges shown in Table 3 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 a period of time equal to or greater than the MTBF specified in Section 7.2 at any steady
state temperature and operating conditions specified in Section 5.
Table 3: DC Output Voltage Regulation
Output Range Min. Nom. Max. Unit
+12VDC* ±5% +11.40 +12.00 +12.60 Volts
+5VDC ±5% +4.75 +5.00 +5.25 Volts
+3.3VDC ±5% +3.14 +3.30 +3.47 Volts
-5VDC ±10% -4.50 -5.00 -5.50 Volts
-12VDC ±10% -10.80 -12.00 -13.20 Volts
+5VSB ±5% +4.75 +5.00 +5.25 Volts
* At +12 V peak loading, regulation at the +12VDC output can go to ±10%.
3.2.2 Remote Sensing
The +3.3VDC output should have provisions for remote sensing to compensate for 100 mV
of cable, connector, and PCB trace drops. The default sense should be connected to pin 11
of the ATX main power connector. The power supply should draw no more than 10 mA
through the remote sense line to keep DC offset voltages to a minimum.