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ATX12V Power Supply Design Guide
Version 2.0
12
3.2.2. Remote Sensing
The +3.3 VDC output should have provisions for remote sensing to compensate for
excessive cable drops. The default sense should be connected to pin 11 of the main power
connector. The power supply should draw no more than 10 mA through the remote sense
line to keep DC offset voltages to a minimum.
3.2.3. Typical Power Distribution
DC output power requirements and distributions will vary based on specific system options
and implementation. Significant dependencies include the quantity and types of processors,
memory, add-in card slots, and peripheral bays, as well as support for advanced graphics or
other features. It is ultimately the responsibility of the designer to derive a power budget
for a given target product and market.
Table 3 through Table 5 and Figure 1 through Figure 3 provide sample power distributions
and a graphical recommendation for cross loading. It should not be inferred that all power
supplies must conform to these tables, nor that a power supply designed to meet the
information in the tables will work in all system configurations.