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Right shunt value selection to optimize the system performance

I'm planning to use a shunt resistor for current feedback in our next motor control inverter design. How do I ensure I have selected the right shunt value to optimize the system performance?

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  • ADI's latest Iso-SD-ADC that is recommended for a shunt based current feedback function is the ADuM7701 product. This ADC has maximum voltage range set to ±250mV. The shunt resistance must be less than ±250mV/"peak current" to ensure optimum operation.

    For example, if the power stage peak current is 8.5A, the maximum shunt resistance is 29.4mΩ. For derating, a smaller shunt is picked such as 25mΩ.

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  • ADI's latest Iso-SD-ADC that is recommended for a shunt based current feedback function is the ADuM7701 product. This ADC has maximum voltage range set to ±250mV. The shunt resistance must be less than ±250mV/"peak current" to ensure optimum operation.

    For example, if the power stage peak current is 8.5A, the maximum shunt resistance is 29.4mΩ. For derating, a smaller shunt is picked such as 25mΩ.

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