TMCS1101_V01 datasheet(29/48 Pages) TI1

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Input Current (A)

-25 -20 -15 -10 -5

10 15 20 25 30 35 40 45

0.5

1.5

2.5

3.5

4.5

D003

TMCS1101A2U

TMCS1101A2B

TMCS1101

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SBOS825A – SEPTEMBER 2019 – REVISED MAY 2020

Product Folder Links: TMCS1101

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Feature Description (continued)

Figure 44. Output Voltage Relationship to Input Current for TMCS1101A2B and TMCS1101A2U

9.3.5 Current-Sensing Measurable Ranges

The TMCS1101 measurable input current range depends on the device variant, as well as the analog supply VS.

The output voltage is limited by VOUT swing to either supply or ground. The linear output swing range to both VS

and GND is calculated by equations Equation 18 and Equation 19.

VOUT,max = VS – SwingVS

(18)

VOUT,min = SwingGND

(19)

Rearranging the transfer function of the device to solve for input current and substituting VOUT,max and VOUT,min

yields maximum and minimum measurable input current ranges described by Equation 20 and Equation 21.

IIN,MAX+ = (VOUT,max – VOUT,0A) / S

(20)

IIN,MAX- = (VOUT,0A – VOUT,min) / S

where

•

IIN,MAX+ is the maximum linear measurable positive input current.

•

IIN,MAX- is the maximum linear measurable negative input current.

•

S is the sensitivity of the device variant.

•

VOUT,0A is the appropriate zero current output voltage.

(21)

TMCS1101A<1-4>B variants accommodate bidirectional current sensing by creating zero-current output voltage

equal to half of the supply (VS) potential, while TMCS1101A<1-4>U variants provide most of the measurable

range for positive currents.

9.4 Device Functional Modes

9.4.1 Power-Down Behavior

As a result of the inherent galvanic isolation of the device, very little consideration must be paid to powering

down the device, as long as the limits in the Absolute Maximum Ratings table are not exceeded on any pins. The

isolated current input and the low-voltage signal chain can be decoupled in operational behavior, as either can be

energized with the other shut down, as long as the isolation barrier capabilities are not exceeded. The low-

voltage power supply can be powered down while the isolated input is still connected to an active high-voltage

signal or system.

TMCS1101 Datasheet(PDF) 29 Page - Texas Instruments

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