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

With a low analog input voltage range, high DC accuracy, and low temperature drift, the AMC1301 is designed

for precision, shunt-based current sensing in applications requiring high voltage isolation.

8.2 Typical Application

Figure 8-1 shows the AMC1301 in a typical application of an AC motor drive. The load current flowing through

an external shunt resistor RSHUNT produces a voltage drop that is sensed by the AMC1301. The AMC1301

digitizes the analog input signal on the high-side, transfers the data across the isolation barrier to the low-side,

reconstructs the analog signal, and presents that signal as a differential voltage on the output pins.

The differential input, differential output, and the high common-mode transient immunity (CMTI) of the AMC1301

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

10

10

RSHUNT

1 uF

100 nF

R4

Floating Gate

Driver Supply

+ DC Link

– DC Link

Load

5 V

D1

10 nF

1 nF

1 nF

VDD1

GND1

INP

INN

AMC1301

VDD2

OUTP

OUTN

GND2

1 uF

100 nF

10

10

Low-side supply

(3.3 V or 5 V)

ADC

10 nF

Figure 8-1. Using the AMC1301 for Current Sensing in a Typical Application

AMC1301

SBAS667G – APRIL 2016 – REVISED APRIL 2023

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