TMCS1101 datasheet(32/48 Pages) TI1

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EXT

RSS

PSRR

CMRR

(%)

EXT

(%)

CMRR

CMRR * V

(%)

Input Current (A)

D008

RSS Max Error, 25°C

566 0D[ (UURU ±

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TMCS1101

SBOS825A – SEPTEMBER 2019 – REVISED MAY 2020

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Application Information (continued)

Figure 45. RSS Error vs Input Current

10.1.1.1 Room Temperature Error Calculations

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 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.

Table 1. Total Error Calculation: Room Temperature Example

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%

CMRR error

eCMRR

0.01%

0.02%

External Field error

eBext

0.41%

0.82%

Sensitivity error

Specified in Electrical Characteristics

0.8%

Nonlinearity error

eNL

Specified in Electrical Characteristics

0.05%

RSS total error

eRSS

1.12%

1.77%

10.1.1.2 Full Temperature Range Error Calculations

To calculate total error across any specific temperature range, Equation 27 and Equation 28 should be used for

RSS maximum total errors, similar to the example for room temperatures. Conditions from the example in Room

Temperature Error Calculations have been replaced with their respective equations and error components for a

–40°C to 85°C temperature range below in Table 2.

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