Filter
Top Products
ATX12V Power Supply Design Guide
Version 2.0
16
Table 6. Typical Power Distribution for a 400 W ATX12V Configuration
Output
Min.
Current
(amps)
Max.
Current
(amps)
Peak
Current
(amps)
+12 V1DC
1 14 16
+12 V2DC
1 15
+5 VDC
0.3 28
+3.3 VDC
0.5 30
-12 VDC
0 0.3
+5 VSB
0 2 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.
400W Cross Regulation
(5V rail + 3.3V rail vs. 12V1 +12V2)
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300 350 400
12V power (watts)
5V + 3.3V power (watts)
Combined Power
(5V rail + 3.3V rail)
Figure 4. Cross Loading Graph for 400W Configuration