JAJSSC7 December 2023 TPSI3100
ADVANCE INFORMATION
There are several sources of error that contribute to total error in the over-current detection accuracy. These include:
For this design, an over-current protection accuracy of ± 10% is required. The comparator offset and voltage reference tolerance of the TPSI3100 can be found in the Electrical Characteristics section of the data sheet.
The error contribution due to the current sense amplifier offset can be estimated as follows:
The resistor tolerances of the resistor divider are chosen as 1%. The current sense amplifier gain error is 1%. The reference voltage tolerance is ± 1.5%. Lastly, the selected shunt resistor tolerance is ± 1%
It is assumed that all error contributors are independent variables, so that the total expected error adds in a root mean squared fashion as follows: