High-Side Setup Using An External Shunt Resistor - Texas Instruments INA901EVM-CVAL User Manual

Operation
To configure the EVM using an external shunt resistor, follow this procedure:
Step 1. Choose an external shunt for the desired use case. Ensure the chosen resistor is thermally
capable of the desired use case.
Step 2. Connect the positive and negative terminals of J1 with the load and bus voltage sources
while powered off.
this method. Ensure that you make the connections such that the sensing location is directly
across the shunt, and there will be no high current on the sensing path. See
Labs - Current Sense Amplifiers: Shunt Resistor Layout
Figure 2. High-Side Setup Using An External Shunt Resistor
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.
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INA901EVM-CVAL Evaluation Module User's Guide
Figure 2 shows the correct connections for a high-side application using
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SBOU216A – October 2018 – Revised June 2020
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