VS
OUT
INA301A1/2/3
LIMIT
GND
IN+
IN
±
ALERT
RESET
VS
VS
VS
INA301EVM Hardware
2
INA301EVM Hardware
The INA301EVM requires a 2.7-V to 5.5-V power supply. Connect the VIN+ and VIN– pins across an
external shunt resistor in series with a 0-V to 36-V supply to determine the current flowing through that
resistor. Use a voltmeter on the OUT pin to measure the voltage output and on the ALERT pin to
determine the comparator output. The comparator threshold is set with a resistor. The open-drain
comparator output is pulled up to VS and there is also a red LED light that serves as a visual indicator of a
tripped comparator.
2.1
Theory of Operation for the INA301EVM
A block diagram of the INA301EVM test board hardware is shown in
. The INA301 test board
contains eight test points, providing access to all eight pins of the INA301 for evaluation. Two terminal
blocks also provide additional convenient connection to the DUT pins. Support circuitry is included on the
PCB but can be removed or bypassed if needed.
Figure 1. INA301EVM Test Board Block Diagram
2.2
INA301EVM Features
The INA301EVM provides basic functional evaluation of the INA301. The fixture layout is not intended to
be a model for the target circuit, nor is it laid out for electromagnetic compatibility (EMC) testing.
The layout of the INA301EVM printed circuit board (PCB) is designed to provide the following features:
•
Ease of access to all device pins
•
Multiple input signal options
•
Space for optional input filtering capacitors and resistors
•
A threshold limit resistor for setting comparator input threshold
•
A jumper reset for the comparator
•
Visual LED indicator of the comparator output with the option to be enabled/disabled through a jumper.
The INA301EVM allows connection to both sides of a remote shunt resistor to measure current, or omit
the shunt resistor and apply a differential voltage directly to the device inputs. This flexibility allows the
testing of device operation in a simulated manner, as well as an actual application.
See the
for comprehensive information about the
family of devices.
3
SBOU154 – November 2015
INA301EVM User's Guide
Copyright © 2015, Texas Instruments Incorporated