L1

L3

L2

VOUTP

VOUTN

VDD2

GND2

GND1

VINN

VINP

VDD1

AMC1301

3.3 V

Motor

Copyright © 2017, Texas Instruments Incorporated

3.3 V

VOUTP

VOUTN

VDD2

GND2

GND1

VINN

VINP

VDD1

AMC1301

3.3 V

3.3 V

VOUTP

VOUTN

VDD2

GND2

GND1

VINN

VINP

VDD1

AMC1301

3.3 V

3.3 V

VOUTP

VOUTN

VDD2

GND2

GND1

SHTDN

VIN

VDD1

AMC1311B

3.3 V

3.3 V

Analog

Filter

To ADC

Analog

Filter

To ADC

Analog

Filter

To ADC

Analog

Filter

To ADC

22

AMC1311, AMC1311B

SBAS786 – DECEMBER 2017

www.ti.com

Product Folder Links: AMC1311 AMC1311B

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Copyright © 2017, Texas Instruments Incorporated

9 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. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The very low input bias current, ac and dc errors, and temperature drift make the AMC1311 a high-performance

solution for industrial applications where voltage measurement with high common-mode levels is required.

9.2 Typical Application

Isolated amplifiers are widely used in frequency inverters that are critical parts of industrial motor drives,

photovoltaic inverters, uninterruptible power supplies, and other industrial applications. The input structure of the

AMC1311 is tailored for isolated voltage sensing using resistive dividers to reduce the high common-mode

voltage.

Figure 49 illustrates a typical use of the AMC1311 for dc bus voltage sensing in a frequency inverter application.

and the AMC1301 isolated amplifiers that are optimized for isolated current sensing. The high-impedance input

and the high common-mode transient immunity of the AMC1311 ensure reliable and accurate operation even in

high-noise environments, such as the power stage of frequency inverters as used in motor drives.

Figure 49. Using the AMC1311B for DC Bus Voltage Sensing in Frequency Inverters