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PWR3-L Power Module for EVAL-Series Boards


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

Key Features

  • 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

Function Description

The power module PWR3-L generates three regulated output voltages from a single unregulated power supply. A block diagram is pictured in Figure 2.

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.


65 KB Power Module PWR3-L User Manual

The power module PWR3-L has been designed and tested exclusively for the usage as a development tool. In particular, strong electromagnetic radiation may be produced. ErSt Electronic GmbH warrants to customer that upon delivery to customer the products purchased shall conform to the applicable manufacturer's specifications for such products. ErSt Electronic GmbH makes no other warranty, expressed or implied, with respect to the products. In particular, ErSt Electronic GmbH shall not be liable for any damage to the product or environment that may result from an improper use of the product.