Intel EPS1U - Manual (Page 5)

SSI
EPS1U Power Supply Design Guide, V1.1
1 Purpose
This specification defines a non-redundant power supply that supports 1U rack mount entry server systems. The
entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are
defined in this specification for open industry use. This specification defines a 125W, 250 W and 350 W power
supply with six outputs; 3.3 V, 5 V, 12 V, -12 V, and 5 VSB. The form factor fits into a 1U system and provides a
wire harness or docking solution for output connections. An IEC connector is provided on the external face for AC
input to the power supply. The power supply contains fans for cooling, while meeting acoustic requirements.
2 Conceptual Overview
In the Entry server market, the bulk power system must source power on several output rails.
These rails are typically as follows:
•
+3.3 V
•
+5 V
•
+12 V
•
–12 V
•
5V standby
NOTE
Local DC-DC converters shall be utilized for processor power, and will ideally convert power from the +12 V
rail, however, they may also convert power from other rails.
The bulk power system may be an n+1 redundant power system or a non-redundant power system.