TMCS1100A2 datasheet(26/35 Pages) TI1

26 / 35 page

TMCS1100

IN+

IN±

VREF

VOUT

GND

5 V

To ADC / MCU

LM4030C-2.5

2.5 V

0.15%, 30 ppm/

ÛC

IIN

0.1 …F

TMCS1100

SBOS820 – SEPTEMBER 2019

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After selecting a VREF for the application design, an appropriate source must be defined. Multiple

implementations are possible, but could include:

•

Resistor divider from the supply voltage

•

Resistor divider from an ADC full-scale reference

•

Dedicated or preexisting voltage reference IC

•

DAC or reference voltage from a system microcontroller

Each of these options has benefits, and the error terms, noise, simplicity, and cost of each implementation must

be weighed. In the current design example, any of these options are potentially available as a 2.5-V VREF is

midrail of the power supply, a common IC reference voltage, and might already be available in the system. If the

primary consideration for the current application design is to maximize precision while minimizing temperature

drift and noise, a dedicated voltage reference must be chosen. For this case, the LM4030C-2.5 can be chosen

for to optimize system accuracy without significant cost addition. Figure 14 depicts the current-sense system

design as discussed.

Figure 14. TMCS1100 Example Current-Sense System Design

TMCS1100A2 Datasheet(PDF) 26 Page - Texas Instruments