OS

REF

EXT

2

2

2

2

2

RSS

I

PSRR

CMRR

V

B

S

NL

e

(%)

e

e

e

e

e

e

e

OS

REF

EXT

worst

I

PSRR

CMRR

V

B

S

NL

e

(%)

e

e

e

e

e

e

e

EXT

EXT

B

IN

B

G

e

(%)

I

REF

S

REF

V

IN

V

RVRR

(V

)

2

S

e

(%)

I

u

S

PSRR

IN

PSRR * (V

5)

e

(%)

I

CM

CMRR

IN

CMRR * V

e

(%)

I

OS

OS

I

IN

I

e

(%)

I

20

TMCS1100

SBOS820 – SEPTEMBER 2019

www.ti.com

Product Folder Links: TMCS1100

Submit Documentation Feedback

Copyright © 2019, Texas Instruments Incorporated

Application Information (continued)

10.1.1.1 Room Temperature Error Calculations

For room-temperature total-error calculations, specifications across temperature and drift are ignored. As an

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 15 A; therefore, calculate error at both 15 A

and 7.5 A to highlight error dependence on the input-current level. Table 1 shows the individual error

components, and the worst-case and RSS total error calculations at room temperature under the conditions

specified. Relative to other errors, the additional error from CMRR and PSRR are negligible, and can typically be

ignored for total error calculations.

Table 1. Total Error Calculation: Room Temperature Example

ERROR

COMPONENT

SYMBOL

EQUATION

% TOTAL ERROR

% TOTAL ERROR

Input offset error

0.3%

0.6%

CMRR error

0.00%

0.01%

PSRR error

0.11%

0.23%

0.05%

0.10%

External Field error

0.17%

0.33%

Sensitivity error

Specified in Electrical Characteristics

0.35%

0.35%

Nonlinearity error

Specified in Electrical Characteristics

0.1%

0.1%

Worst-case total error

1.1%

1.7%

RSS total error

0.58%

0.97%