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LM25056 Evaluation Board
Texas Instruments
Application Note 2144
Joseph Wu
January 16, 2012
Introduction
The LM25056EVK evaluation kit provides the design engi-
neer with a telemetry measurement IC board with a PMBus™
compliant SMBus™/I2C interface. This application note de-
scribes the various functions of the board, how to test and
evaluate it, and how to use the companion graphical user in-
terface (GUI). The GUI is used to collect telemetry, configure
warning and fault thresholds, and assist the designer with se-
lection of external components for a specific application. Use
of the advanced telemetry and monitoring capabilities of this
device requires the installation of the Intelligent Power Man-
ager graphical user interface. Please check the LM25056
webpage for the latest software and datasheet information.
PCB Features
•
Input voltage range: 3V to 15V (limited by input clamp D1)
•
Programmable Current Measurement Range: 7.5 Amps or
15 Amps
•
Computer connection to communications dongle, through
USB cable
•
PCB Size: 3.5” x 3.5”
•
Solution Size: 0.75” x 0.75”
Simplified Schematic
30160361
FIGURE 1. Simplified Evaluation Board Schematic
The simplified schematic for the LM25056 evaluation board
is shown in Figure 1. Connections to the PMBus interface are
provided by J1. Panduit® terminal lugs bolt down to the PCB
to provide input and output connections. Jumpers ADR0,
ADR1, and ADR2 set the PMBus address of the device to one
of 27 unique addresses. Jumpers also exist to connect EN-
ABLE to an external VDD supply, VIN to a voltage divider to
be measured with VAUX, and a DIODE bypass to disable the
temperature measurement. Test points are provided to mea-
sure the input voltage, output voltage, VDD, VREF, the sense
resistor voltage (through RS+ and RS-), and the temperature
DIODE. Other test points can be used to apply voltage to EN-
ABLE and VDDX pins.
© 2012 Texas Instruments Incorporated 301603 SNVA613 www.ti.com
LM25056 Evaluation Board AN-2144
