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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
2.2.3 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. Table 3, through Table 6 show
the power distribution and cross loading tables for power supplies in the range of 180 W to 240 W. It is
ultimately the responsibility of the designer to define a power budget for a given target product and market.
Table 3. Typical Power Distribution for 180 W TFX12V Configurations
Output
Minimum Current
(amps)
Rated Current
(amps)
Peak Current
(amps)
+12 VDC 1.0 13.0 15.0
+5 VDC 0.3 12.0 (Note)
+3.3 VDC 0.5 16.7 (Note)
-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 63 W
Peak currents may last up to 17 seconds with not more than one occurrence per minute
180W Cross Regulation
(5V rail + 3.3V rail vs. 12V)
0
10
20
30
40
50
60
70
0 50 100 150 200
12V power (watts)
5V + 3.3V power (watts)
Combined Power
(5V rail + 3.3V rail)
Figure 2. Cross Loading Graph for 180W Configuration