Altera Stratix V Advanced Systems Development Board - Manual (Page 75)

Chapter 2: Board Components 2–65
Power Supply
January 2014 Altera Corporation Stratix V Advanced Systems Development Board
Reference Manual
Power Supply
The development board’s power is provided through a laptop style DC power input
or through the PCI Express edge connector. The DC voltage is stepped down to the
various power rails used by the components on the board or components installed
into the HSMC connectors. A PCI Express compliant 2x4 ATX power connector is also
available in addition to the DC power input or the PCI Express edge connector power.
The 2x4 ATX power supply is 12 V with 12.5 A, providing up to an additional 150 W
to the board.
An on-board multi-channel analog-to-digital converter (ADC) measures both the
voltage and current for several specific board rails. The power utilization is displayed
in a GUI that graphs power consumption versus time.
Table 2–29 lists the maximum allowed draws of the power input.
Power Distribution System
The power tree minimizes power board space for the PCI Express 225 W High Power
board requirements and gives the maximum power under 5.5 A for a 12 V PCI
Express input and 3.0 A for a 3.3 V PCI Express rail. As per the 225 W High Power
specification, a 2x4 ATX connector is available to supply 12.5 A for an additional 12 V
power rail to the board.
The switching regulators are assumed to have 85% of efficiency. Regulator
inefficiencies and sharing are reflected in the currents shown, which are conservative
absolute maximum levels.
Table 2–29. Power Input Maximum Allowed Draws
Source Voltage (V) Current (A) Wattage (W)
25 W PCI Express edge connector
3.3 — —
12.0 — —
75 W PCI Express edge connector
3.3 3.0 9.0
12.0 5.5 66.0
Laptop Supply—DC input (1) 15.0 8.0 120.0
2x4 PCI Express ATX connector 12.0 12.5 150.0
Note to Table 2–29 :
(1) The minimum and maximum voltage allowed for the DC input is 12 V and 16 V respectively.