ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID Date Version Classification
336521 02/01/2023 Public

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DC Voltage Regulation – REQUIRED

The DC output voltages are required to remain within the regulation ranges shown in Table 4-2, when measured at the load end of the output connectors under all line, 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 Section Section 3.1. To compensate for these power 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

Range

Min

Nom

Max

Unit

+12V1DC2

+5% / -7%

+11.20

+12.00

+12.60

V

+12V2DC2

+5% / -7%

+11.20

+12.00

+12.60

V

+5VDC

±5%

+4.75

+5.00

+5.25

V

+3.3VDC

±5%

+3.14

+3.30

+3.47

V

-12VDC3

±10%

-10.80

-12.00

-13.20

V

+5VSB

±5%

+4.75

+5.00

+5.25

V

Note:Voltage tolerance is required at all connectors
+12V1DC and +12V2DC requirement applies to all +12V power rails
-12VDC output is optional