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, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

Isolated modulators are widely used in application where a high-voltage domain is galvanically isolated from a

low-voltage domain for safety or functional reasons. A typical application is the sensing of the phase currents in

a frequency inverter.

7.2 Typical Application

Figure 7-1 shows a simplified schematic of a full-bridge motor drive that uses an AMC0106M25 to sense the

motor current. The current flowing through an external shunt resistor RSHUNT produces a voltage drop that is

sensed by the AMC0106M25. The AMC0106M25 digitizes the analog input signal on the high-side and transfers

the data across the isolation barrier to the low-side. The device then outputs the digital bitstream on the DOUT

pin that is synchronized to the clock applied to the CLKIN pin. The digital bitstream is processed by a low-pass

digital filter in a microcontroller unit (MCU) or FPGA.

The 48V DC link voltage in this application is sensed by an AMC0136 isolated modulator.

49.9

RSHUNT

1 nF

AVDD

AGND

INP

INN

AMC0106M25

DVDD

CLKIN

DOUT

DGND

4.7 uF

1 uF

100 nF

Low-side supply

(3.3 V or 5 V)

2

M

Gate

Driver

GND

1 nF

Signal Domain

Power Domain

+250 mV

0 V

–250 mV

D1

10 nF

100 nF

Gate

Driver

AVDD

AGND

IN

AGND

AMC0136

DVDD

CLKIN

DOUT

DGND

100 pF

+

–

48V

R1

R2

ICROSS

49.9

1 uF

100 nF

MCU

100 nF

1uF

DC/DC

GND

6V

5V

R4

C2

Figure 7-1. Using the AMC0106M25 for Current Sensing in a Full-Bridge 48V Motor Driver Design

AMC0106M25

SBASAX1A – AUGUST 2024 – REVISED JULY 2025

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