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Part Number: INA181
The common-mode voltage of INA181 is 26V max.
If this product is used for low-side sensing, can it be applied to higher bus voltage systems?
(For example, 48V or 60V or Higher DC-Bus voltage motor control system)
As long as the device supply shares the same ground as the DC-LINK system and the supply is kept within the allowable limits, the configuration below can be used, provided the voltage across Rsense is within the limits supported by the device
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In reply to Carlos Silva85:
In reply to Nam, Sang-il:
It is possible to use a low side configuration independently of the power supply voltage. The device itself will require its own supply with a range of 2.7 to 5.5V.
The 26V limitation only applies to the bus voltage where high side sensing is employed.
The Power Supply can exceed the 26V if you are doing low-side sensing because the common mode voltage in this case is close to the ground potential (0V).
In reply to Motaz Khader:
Just to clarify, in case my previous answer generated any questions, yes the device can measure currents on a DC-LINK system of any given voltage, assuming it is a) Used on the low side configuration b) The voltage developed across the Rsense resistor doesn't exceed the maximum values allowed by the device for the IN- and IN+ inputs, for example, in case of large inrush, pre-charge or a temporary inrush caused by a brownout, in which case a clamping mechanism should be employed. c) The device has its own power supply, referenced to the system ground, not exceeding 26V 5.5V, as per datasheet spec.
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