R

2

12W

R

3

12W

R

SHUNT

AMC1200

AMC1200B

Gated

Drive

Circuit

To Load

Floating

Power Supply

HV+

Isolation

Barrier

C

2

(1)

330pF

C

3

10pF

(optional)

VDD1

VINP

VINN

GND1

VDD2

VOUTP

VOUTN

GND2

C

4

10pF

(optional)

C

1

(1)

0.1 F

m

D

1

5.1V

R

1

Gated

Drive

Circuit

Power

Supply

HV-

C

5

(1)

0.1 F

m

ADC

TMC320

C/F28xxx

AMC1200, AMC1200B

www.ti.com

SBAS542D – APRIL 2011 – REVISED JULY 2015

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. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The AMC1200 and AMC1200B devices offer unique linearity, high input common mode rejection, low DC errors

and low temperature drift. These features make the AMC1200 a robust, high-performance isolation amplifier for

industrial applications where high voltage isolation is required.

8.2 Typical Applications

8.2.1 Motor Control

Figure 32 shows a typical operation of the AMC1200 and AMC1200B devices in a motor-control application.

Measurement of the motor phase current is done through the shunt resistor, RSHUNT (in this case, a two-terminal

shunt).

(1)

Place these capacitors as close as possible to the AMC device.

Figure 32. Typical Application Diagram

The high-side power supply (VDD1) for the AMC1200 and AMC1200B are derived from the power supply of the

upper gate driver. Further details are provided in the Power Supply Recommendations section.

The high transient immunity of the AMC1200 and AMC1200B ensures reliable and accurate operation even in

high-noise environments such as the power stages of the motor drives.

As shown in Figure 37, TI recommends placing the bypass and filter capacitors as close as possible to the AMC

device to ensure best performance.

Copyright © 2011–2015, Texas Instruments Incorporated

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