Intel manual Typical Power Distribution for a 300 W ATX12V Configuration

ATX12V Power Supply Design Guide

Version 2.0

Table 4. Typical Power Distribution for a 300 W ATX12V Configuration

		Min.	Max.	Peak
		Current	Current	Current
Output		(amps)	(amps)	(amps)
+12 V1DC		1.0	8.0	10.0
+12 V2DC		1.0	14.0
+5	VDC	0.3	20.0
+3.3	VDC	0.5	20.0
-12	VDC	0.0	0.3
+5 VSB		0.0	2.0	2.5

Note: Total combined output of 3.3 V and 5 V is î￿￿￿￿￿:￿

Peak currents may last up to 17 seconds with not more than one occurrence per minute

12V1DC and 12V2DC should have separate current limit circuits to meet 240VA safety requirements.

								300W Cross Regulation
							(5V rail + 3.3V rail vs. 12V1 +12V2)
	120
(w atts)	100
	80
er
p ow	60														Combined Power
															(5V rail + 3.3V rail)
3.3V	40
+
5V	20
	0
	0	20	40	60	80	100	120	140	160	180	200	220	240	260	280
						12V power (watts)

Figure 2. Cross Loading Graph for 300W Configuration

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