Learn how to implement filter circuits with ON Semiconductor’s NCS21xR and NCS199AxR current sense amplifiers when really small shunt resistors are used, 1 mΩ or less.
Filtering at the input or output of a current sense amplifier (CSA) may be required for several different reasons. This blog post focuses on implementing filter circuits with ON Semiconductor’s.NCS21xR and NCS199AxR current sense amplifiers when really small shunt resistors are used, 1 mΩ or less.
Shunt resistors below 1 mΩ have shunt inductance that cause spike transient events on the current sensing line that can overload the front end of the CSA. Read this post to learn about the main considerations with regard to filtering out these specific spike transient events.
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