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Thankfully, the INA293 does not have this behavior due to an improved input architecture. It shows linear behavior even with Vsense < 20mV. Section 126.96.36.199 of the datasheet mentions this:
188.8.131.52 Low VSENSE Operation
The INA293 operates with high performance across the entire valid VSENSE range. The zero-drift input architecture of the INA293 provides the low offset voltage and low offset drift needed to measure low VSENSE levels accurately across the wide operating temperature of –40°C to +125°C. Low VSENSE operation is particularly beneficial when using low ohmic shunts for low current measurements, as power losses across the shunt are significantly reduced."
Thank you for your support.
I understood about low Vsense operation.
However, in my customer, the output is the same(4V) between 1A and 4.5A for Isense.
* Normal value is output at 4.5A or more.
The following are the settings.
Based on your description, the shunt voltage (IN+ - IN-) will range from 9mV to 49.5mV.
Which gain version is being used? Even at the minimum gain of 20V/V, the output should range from 180mV to 990mV.
Can you please probe the voltage directly at the IN+ and IN- pins to see what is truly being applied to the device? Can you also provide a real schematic for debug?