Tool/software:
Dear Texas Instrument Team,
I hope that you are doing well.
After reviewing the INA226 datasheet, I noticed that the VBUS and IN+/IN− pins do not include built-in overvoltage protection. As a result, I have been running simulations in LTspice to design an external overvoltage protection circuit, particularly for the VBUS pin.
The solution I developed appears to work effectively; however, it introduces a voltage drop due to the use of a MOSFET in series with the power input. I’ve attached circuit simulation images below for your reference.
I would greatly appreciate your assistance with the following:
• Could you suggest a more suitable overvoltage protection circuit that does not impact the VBUS input voltage accuracy?
• Optionally, do you have any recommendations for protecting the current-sense inputs (IN+/IN−) to ensure that the differential voltage across the shunt resistor does not exceed the maximum 81.92 mV input limit of the INA226?
Thank you very much for your support. I look forward to hearing from you.
Best regards.
