The PWR3-L power supply module shown in Figure 1
is a lower cost alternative to the
PWR3, lacking some
features that are only very rarely used. In particular, there are no
longer eight individual reference voltages, there are no 5V and
adjustable output voltage options and the total (sum of all outputs)
output current is limited to 4A.
The output current capability is sufficient to supply one EVAL-series
board with a Virtex-E, Virtex, Spartan-IIE or Spartan-II FPGA
device. Depending on the power consumption of the implemented hardware
design, supplying more than one board is possible.
Figure 1: Top view of the PWR3-L module
The power module PWR3-L generates three regulated output voltages from
a single unregulated power supply. A block diagram is pictured in
- Input power supply voltage range 4 - 24V
- Linear regulator for VCCINT (1.5V, 1.8V or 2.5V)
- Linear regulator for VCCO (1.5V, 1.8V, 2.5V or 3.3V)
- Switching regulator for 3.3V (VCCOPT)
- Output voltages selectable with jumper
- All regulators are protected against short circuits
- The linear regulators are protected against thermal overload
- Max. 4A load current combined for all output voltages
- Min. 2A load current available on linear regulator outputs
- All output voltages available on header connectors and power connectors
- Output power sufficient for one or more EVAL-series board module(s)
- Specially made to be stacked with EVAL board modules for Spartan-II, Spartan-IIE, Virtex and Virtex-E
- Board size 86mm x 150mm
Figure 2: Block diagram of the PWR3-L module
Figure 3: Bottom views with LEDs
The input supply voltage can be in the range from 4V to 24V. A series
diode at the input protects the module from reversed supply voltages.
The 3.3V output voltage is generated with a switching regulator
working at 400kHz operating frequency and having an output current
capability of at least 4A. The output is short circuit protected.
VCCINT and VCCO output voltages are generated with low dropout linear
regulators that respond very fast to step changes in load which makes
them suitable for the supply of low voltage high speed digital
chips. The output voltage is configurable with jumpers. VCCINT can be
set to 1.5V, 1.8V and 2.5V. VCCO can be set to 1.5V, 1.8V, 2.5V and
3.3V. All three output voltages are available on header and power
connectors. Each of the power connectors allows the connection of four
wires, two for ground and two for output power.
Four LEDs (see Figure 3) show the state of the three output
voltages and the power supply. The three LEDs that correspond to the
three output voltages (VCCO orange, VCCINT red and VCCOPT yellow) are
driven directly. The input power LED (blue) is driven by an
operational amplifier used as a constant current source.
Power Module PWR3-L User Manual