Xilinx M401, User Manual, Page: 29 / 32

ML401/ML402/ML403 Evaluation Platform www.xilinx.com 29
UG080 (v2.5) May 24, 2006
Detailed Description
R
25. Onboard Power Supplies
Power supply circuitry on the board generates 1.2V, 1.25V, 1.8V, 2.5V, and 3.3V voltages to
power the components on the board. The 1.2V, 2.5V, and 3.3V supplies are driven by
switching power regulators. When these three switching regulators report they are
running at their nominal voltages, the PWR Good LED is turned on.
The diagram in Figure 4 shows the power supply architecture and maximum current
handling on each supply. The typical operating currents are significantly below the
maximum capable. The ML40
x board is normally shipped with a 15W power supply
which should be sufficient for most applications.
26. AC Adapter and Input Power Switch/Jack
The ML40 x board ships with a 15W (5V @ 3A) AC adapter. The power connector is a
2.1 mm x 5.5 mm barrel type plug (center positive). For applications requiring additional
power, such as the use of expansion cards drawing significant power, a larger AC adapter
might be required. If a different AC adapter is used, its load regulation should be less than
10% or better than ±10%. The power switch turns the board on and off by controlling the
supply of 5V to the board.
27. Power Indicator LED
The PWR Good LED lights when the 1.2V, 2.5V, and 3.3V power supplies are all at their
nominal operating conditions. If the PWR Good LED is off, blinking, or glowing lightly,
this indicates a fault condition, such as a short or overload condition, might exist.
28. INIT LED
The INIT LED lights upon power-up to indicate that the FPGA has successfully powered
up and completed its internal power-on process.
Figure 4: Power Supply Diagram
TPS54310
3A SWIFT
TPS54610
6A SWIFT
TPS51100
3A DDR LDO
TPS73118
150mA LDO
TPS54310
3A SWIFT
5V Brick
3A
1.25V
to VTT
1.2V
2.5V
5V to USB and PS/2
2.5V to DDR SDRAM
to FPGA Core
3.3V
to FPGA I/O
1.8V
to PROM
UG080_04_022305
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