Supply Setup For Common And Differential Voltage - Texas Instruments INA901EVM-CVAL User Manual

www.ti.com
To configure the EVM to evaluate a specific voltage use case, follow this procedure:
Step 1. Set the differential voltage: Connect an unpowered positive differential voltage across the
positive and negative terminals of J1. Given the internal GND reference of the device, make
sure that the IN+ pin is the more positive of the two inputs.
Step 2. Set the common mode voltage: to evaluate at a specific common mode, connect an
unpowered –15-V to 65-V voltage supply to the inputs by connecting the positive lead of the
external voltage source to the negative terminal of J1, and negative lead to a GND test point.
This action effectively raises the absolute common-mode voltage of the input pins, while still
retaining a positive input differential signal.
when this is done. Ensure that the supplies used to perform this are able to withstand the
voltages present before using this method.
Figure 3. Supply Setup for Common and Differential Voltage
Step 3. Power on all supplies.
Step 4. Measure the output voltage at INA_OUT with respect to GND using a DMM.
Step 5. Observe the overcurrent trigger: Using either a DMM or oscilloscope, measure the voltage at
CMP_OUT. Slowly increase the magnitude of the load current until it measures > 125 mV.
Observe the comparator output change states.
SBOU216A – October 2018 – Revised June 2020
Submit Documentation Feedback
Copyright © 2018–2020, Texas Instruments Incorporated
Figure 3 shows how this supply setup should look
INA901EVM-CVAL Evaluation Module User's Guide
Operation
9