Input Current (A)

-25 -20 -15 -10 -5

0

5

10 15 20 25 30 35 40 45

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

D003

TMCS1101AxU

TMCS1101AxB

Time (Ps)

0

5

10

15

20

0

5

10

15

20

25

30

6

5

4

3

2

1

0

D013

16

TMCS1101

SBOS825 – SEPTEMBER 2019

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Feature Description (continued)

The output value is effectively an average over the sampling window; therefore, a large-enough current transient

can drive the output voltage to the full range in the first sample response. This condition is likely to be true in the

case of a short-circuit or fault event. Figure 8 shows an input-current step of 100 A, and the output response of

an TMCS1101A3B. In the case of Vout1, the event occurs near the beginning of a sampling window, and so the

output transitions to full scale in the first integrator output sample. In the case of Vout2, the event occurs near the

end of an integration cycle, so there are two distinct output transitions. The relative timing and size of the input

current transition determines whether the output transitions to full scale in a single cycle. In either case, the total

response time is approximately one integration period.

Figure 8. Transient Response to a Large Input Current Step

9.3.4 Internal Reference Voltage

range of the device, and allows for unidirectional or bidirectional sensing, as described in Absolute Maximum

Ratings. The TMCS1101AxB variants have a zero-current output set by Equation 12, while the TMCS1101AxU

devices have a zero-current output voltage set by Equation 13.

(12)

(13)

These respective reference voltages enable a bidirectional measurable current range for the AxB devices and a

unidirectional measurement range for the AxU devices, as shown in Figure 9.

Figure 9. Output Voltage Relationship to Input Current for TMCS1101A2B and TMCS1101A2U