Datasheet

Getting Started
The LM25056 evaluation kit hardware is shown in Figure 2.
The board offers two connections for the system input voltage
and load. In the board's current form, the system voltage and
load can be plugged directly into the female banana recepta-
cles. To measure higher currents, the sense resistors can be
paralleled or replaced to maintain the full-scale measurement
voltage of the sense resistor. A footprint for RS2 is not popu-
lated and is provided to accommodate evaluation of designs
for measuring currents greater than 15A. For currents higher
than 15A, it is recommended to use the copper Panduit® lugs
with low gauge wire to minimize the cable power dissipation
and voltage drops.
The LM25056EVB is supplied with the PMBus address set to
16h as dictated by the jumper configuration of the ADR0,
ADR1, and ADR2 jumper connections.
30160333
FIGURE 2. Connection Illustration
The first step to evaluate the telemetry features of LM25056
demonstration is to install the GUI software. The software is
included on a CD in the evaluation kit and is titled PMBMan-
ager-x.x.x-xxxxxxxx.exe, where the x characters indicate the
software version and build date. This file should be executed
on a PC running Windows XP or later to install the software.
Once the GUI software is installed the hardware should be
configured as shown in Figure 2
Hardware Setup Steps
1.
Connect the input supply to the VIN and GND banana
plugs.
2.
Connect the load to the VOUT and GND banana plugs.
3.
Connect the FTDI Dongle to the 10 pin connector on the
left side of the board.
4.
Connect the supplied mini USB cable from the FTDI
dongle to an USB port on a PC.
When the FTDI dongle is connected for the first time the user
will be prompted to install the device drivers. For the most
current driver installation procedure refer to the
README.TXT file in the installation directory.
For testing the board functionality, a low inductance connec-
tion to the input supply is recommended. Its purpose is to
minimize voltage transients which occur when the load cur-
rent changes or is shut off. If not careful, wiring inductance in
the supply lines will generate a voltage transient at shutoff
which can exceed the absolute maximum rating of the
LM25056, resulting in its destruction. To protect against such
voltage transients, a transient voltage suppression (TVS)
diode D1 is provided to clamp the voltage at the input to within
safe operating limits.
Device Evaluation
After configuring the hardware connections, apply an input
voltage of 12V to the device. The current hardware configu-
ration allows the LM25056 device to work with 3V to 15V
system rails; however, this getting started guide will assume
an input voltage of 12V. Launch the GUI by going to the Win-
dows Start menu -> All Programs -> PMBManager-x.xxxxx -
> PMBManager. A pulldown menu should come up with a list
of possible devices that the PMBManager can run. Select the
"LM25056" option as shown in Figure 3.
30160301
FIGURE 3. Device Selector
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