7 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.

7.1 Application Information

The low input voltage range, low nonlinearity, and low temperature drift make the AMC3301 a high-performance

solution for industrial applications where shunt-based current sensing with high common-mode voltage levels is

required.

7.2 Typical Application

The AMC3301 is ideally suited for shunt-based current sensing applications where accurate current monitoring is

required in the presence of high common-mode voltages. The AMC3301 integrates an isolated power supply for

the high-voltage side and therefore makes the device particularly easy to use in applications that do not have a

high-side supply readily available or where a high-side supply is referenced to a different ground potential than

the signal to be measured.

Figure 7-1 shows a simplified schematic of the AMC3301 in a solar inverter where the phase current is

measured on the grid-side of an LCL filter. Although the system offers a supply for the high-side gate driver,

there is a large common-mode voltage between the gate driver supply ground reference and the shunt resistor

on the other side of the LCL filter. Therefore, the gate driver supply is not suitable for powering the high-side

of an isolated amplifier that measures the voltage across the shunt. The integrated isolated power supply of the

AMC3301 solves that problem and enables current sensing at locations that is optimal for the system.

The diagram also shows the AMC3330 being used for sensing the AC output voltage.

to MCU

ADS8363

16-Bit ADC

1 µF

100 nF

1 nF

1 nF

100 nF

10 Ÿ

10 Ÿ

10 nF

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

NC

AMC3301

1 µF

1 nF

100 nF

47 NŸ

DCDC_IN

LDO_OUT

VDD

OUTP

OUTN

GND

DIAG

DCDC_GND

3.3 V / 5 V supply

to MCU

to uC (optional)

GND

1 µF

100 nF

1 nF

1 nF

100 nF

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

NC

AMC3330

1 µF

1 nF

100 nF

47 NŸ

DCDC_IN

LDO_OUT

VDD

OUTP

OUTN

GND

DIAG

DCDC_GND

3.3 V / 5 V supply

to uC (optional)

GND

ADS8363

16-Bit ADC

to grid (L1)

RSHUNT

DC+

DC-

IPHASE

HS Gate

Driver

Supply

LS Gate

Driver

Supply

PGND

PGND

SW

RL11

RL1SNS

SW

PGND

N

N

RL12

Figure 7-1. The AMC3301 in a Solar Inverter Application

AMC3301

SBAS917C – AUGUST 2019 – REVISED MAY 2025

www.ti.com

22

Submit Document Feedback

Copyright © 2025 Texas Instruments Incorporated

Product Folder Links: AMC3301