8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The AMC0x02R has low analog input voltage range, high accuracy, low temperature drift, and high common-

mode transient immunity. The AMC0x02R is primarily designed for shunt-based current-sensing applications

where accurate current monitoring is required in the presence of high common-mode voltages. The AMC0x02R

is preferred for isolated current sensing in motor drives, frequency inverters, and uninterruptible power-supply

applications.

8.2 Typical Application

The following image shows the AMC0x02R in a typical application. The load current flowing through an external

shunt resistor RSHUNT produces a voltage drop. The AMC0x02R high-side circuitry senses the voltage drop

across the shunt resistor, then digitizes and transfers data across the isolation barrier to the low side. Low-side

circuitry reconstructs the digitized data into an analog signal and provides the signal as single-ended ratiometric

voltage on the output pin.

The differential input, single-ended ratiometric output, and high common-mode transient immunity (CMTI) of the

AMC0x02R provide reliable and accurate operation even in high-noise environments.

10

10

10 nF

VDD1

GND1

INP

INN

VDD2

OUT

REFIN

GND2

RSHUNT

1 uF 100 nF

Floating Gate

Driver Supply

+ DC Link

– DC Link

1 uF

100 nF

Low-side supply

(3.3 V or 5 V)

Load

1 nF

1 nF

to ADC

100nF

Reference voltage

Figure 8-1. Using the AMC0x02R for Current Sensing in a Typical Application

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