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ATX12V Power Supply Design Guide
Version 2.0
14
Table 4. Typical Power Distribution for a 300 W ATX12V Configuration
Output
Min.
Current
(amps)
Max.
Current
(amps)
Peak
Current
(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
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)
0
20
40
60
80
100
120
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280
12V power (watts)
5V + 3.3V power (watts)
Combined Power
(5V rail + 3.3V rail)
Figure 2. Cross Loading Graph for 300W Configuration