Hi
INA210 is used to sample output current, the output voltage is 12.5V.
customer use 12V power rail to power INA210, so Vs=12V, IN+=12.5V, can INA210 work at this condition?
in datasheet, we can see test condition, Vs=5V, VIN+=12V
the voltage between R2 and R4 will much larger than Vs 5V, why this condition is ok for INA210?
this working condition is different from common OPA.
thanks.
Hello Max,
The condition where Vin > Vs is perfectly fine for the INA210 and other current sense amplifiers like it. The simplified schematic makes the part look like a standard difference amplifier, but this is not the case. The input stage of the device contains special biasing circuitry which allows the input common-mode voltage to be much higher than the supply voltage in order to conveniently measure currents on large bus voltages.
Please see the overview in section 7.1 of the datasheet copied blow.
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Best regards,
Ian Williams
Applications Manager
Current & Magnetic Sensing
