Dc Output - Required; Dc Voltage Regulation - Required; Dc Output Current - Required; Table 4-2: Dc Output Voltage Regulation - Intel ATX 3.0 Design Manual

Electrical
4.2

DC Output - REQUIRED

4.2.1 DC Voltage Regulation – REQUIRED
The DC output voltages are required to remain within the regulation ranges shown in
Table
load, and environmental conditions specified in Chapter 7.
The lower voltage range for 12V is allowed to be -7% to allow for the power excursion
requirements now described in
excursions the nominal voltage could be changed to 12.1 or 12.2 Volts, depending on
Power Supply design.

Table 4-2: DC Output Voltage Regulation

Output
+12V1DC
+12V2DC
+5VDC
+3.3VDC
-12VDC
+5VSB
NOTES:
1. Voltage tolerance is required at all connectors
2. +12V1DC and +12V2DC requirement applies to all +12V power rails
3. -12VDC output is optional
4.2.2 DC Output Current – REQUIRED
The below table summarizes the expected output transient step sizes for each output.
All items in the below table are REQUIRED, unless specifically called out as
RECOMMENDED.

Table 4-3: DC Output Transient Step Sizes

336521
4-2, when measured at the load end of the output connectors under all line,
Range
2 +5% / -7%
2 +5% / -7%
±5%
±5%
3
±10%
±5%
Output
(% of rated output amps)
+12V1DC 4
+12V2DC 4 85% of CPU supported in Table 2-1
+12V3/4
4
+5VDC
+3.3VDC
Section 3.1. To compensate for these power
Min Nom
+11.20 +12.00
+11.20 +12.00
+4.75 +5.00
+3.14 +3.30
-10.80 -12.00
+4.75 +5.00
Maximum Step Size
40% (Required)
70% (Recommended)
Steps from 100%  300%
30%  100% 3
30%
30%
Max
+12.60
+12.60
+5.25
+3.47
-13.20
+5.25
Maximum Step Size
(A)
-
2 -
-
-
Unit
V
V
V
V
V
V
31