AMC1200_15 Datasheet, PDF (15/31 Pages) Texas Instruments – AMC1200/B Fully-Differential Isolation Amplifier

www.ti.com
8 Application and Implementation
AMC1200, AMC1200B
SBAS542D – APRIL 2011 – REVISED JULY 2015
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, R_SHUNT (in this case, a two-terminal
shunt).
Floating
HV+ ^{Power Supply}
Isolation
Barrier
To Load
R_SHUNT
Gated
Drive
Circuit
Power
Supply
Gated
Drive
Circuit
R₁
D₁
R₂
5.1V 12W
R₃
12W
AMC1200
AMC1200B
C₂₍₁₎
330pF
C₃
10pF
(optional)
C₄
10pF
(optional)
C₁₍₁₎
0.1mF
VDD1 VDD2
VINP VOUTP
VINN VOUTN
GND1 GND2
C₅₍₁₎
0.1mF
TMC320
C/F28xxx
ADC
HV-
(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
Product Folder Links: AMC1200 AMC1200B
Submit Documentation Feedback
15