SBOS825D September 2019 – July 2021 TMCS1101
For room-temperature total-error calculations, specifications across temperature and drift are ignored. As an example, consider a TMCS1101A1B with a supply voltage (VS) of 3.3 V and a worst-case common-mode excursion of 600 V to calculate operating-point-specific parameters. Consider a measurement error due to an external magnetic field of 30 µT, roughly the Earth's magnetic field strength. The full-scale current range of the device in specified conditions is slightly greater than 33 A; therefore, calculate error at both 25 A and 12.5 A to highlight error dependence on the input-current level. Table 10-1 shows the individual error components and RSS maximum total error calculations at room temperature under the conditions specified. Relative to other errors, the additional error from CMRR is negligible, and can typically be ignored for total error calculations.
|ERROR COMPONENT||SYMBOL||EQUATION||% TOTAL ERROR AT IIN = 25 A||% TOTAL ERROR AT IIN = 12.5 A|
|Input offset error||eIos||0.36%||0.72%|
|External Field error||eBext||0.11%||0.22%|
|Sensitivity error||eS||Specified in Section 7.9||0.8%||0.8%|
|Nonlinearity error||eNL||Specified in Section 7.9||0.05%||0.05%|
|RSS total error||eRSS||1.12%||1.77%|