Input Current (A)

-25

-20

-15

-10

-5

0

5

10

15

20

25

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

-24.5 A, 0.05 V

0 A, 2.5 V

23 A, 4.8 V

D001

OUT,min

REF

MAX

V

V

I

S

OUT,max

REF

MAX

V

V

I

S

u

REF,min

OUT,min

IN,FS

V

V

I

S

u

REF,max

OUT,max

IN,FS

V

V

I

S

25

TMCS1100

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SBOS820 – SEPTEMBER 2019

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After selecting the appropriate sensitivity variant for the application, the zero-current reference voltage defined by

within the linear measurement range, shown in Equation 31 and Equation 32.

(31)

(32)

must be repeated with a lower sensitivity variant of the TMCS1100. Equation 26 can be manipulated to solve for

voltage ranges as in Equation 33 and Equation 34.

(33)

(34)

design value provides a linear input current-sensing range of –24.5 A to +22 A, with the positive current defined

as current flowing into the IN+ pin.

Table 5. Example VREF Limits and Associated Current Ranges

REFERENCE PARAMETER

EXAMPLE VALUE

MAXIMUM LINEAR CURRENT SENSING RANGE

2.05 V

26.5 A

–20 A

2.7 V

20 A

–26.5 A

2.5 V

22 A

–24.5 A

The transfer function of the TMCS1100 linear sensing range for these design parameters is shown in Figure 13.

Figure 13. Application Example Design Transfer Curve