Input Current, A

0

5

10

15

20

25

1

2

3

4

5

6

7

8

9

10

0

D008

RSS Error, 25°C

566 (UURU ±

ƒ& WR

ƒ&

OS, T

EXT

2

2

2

2

RSS, T

I

PSRR

CMRR

B

S, T

NL

e

(%)

e

e

e

e

e

e

'

'

'

20

TMCS1101

SBOS825 – SEPTEMBER 2019

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Product Folder Links: TMCS1101

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Copyright © 2019, Texas Instruments Incorporated

Application Information (continued)

(27)

The total error calculation has a strong dependence on the actual input current; therefore, always calculate total

error across the dynamic range that is required. These curves asymptotically approach the sensitivity and

nonlinearity error at high current levels, and approach infinity at low current levels because of error terms with

input current in the denominator. Key figures of merit for any current-measurement system include the total error

percentage at full-scale current, as well as the dynamic range of input current over which the error remains below

some key level. Figure 10 illustrates the total RSS error as a function of input current for a TMCS1101A2B at

Figure 10. RSS Error vs Input Current