AMC1200-Q1_16 Datasheet, PDF (15/30 Pages) Texas Instruments – Fully-Differential Isolation Amplifier

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8 Application and Implementation
AMC1200-Q1
SBAS585A – SEPTEMBER 2012 – REVISED JANUARY 2016
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-Q1 offers unique linearity, high input common-mode rejection, low dc errors, and low temperature
drift. These features make the AMC1200-Q1 a robust, high-performance isolation amplifier for automotive
applications where high voltage isolation is required.
8.2 Typical Applications
8.2.1 Traction Inverter
Figure 32 shows a typical operation of the AMC1200-Q1 for current sensing in a traction inverter application.
Measurement of the phase current is done through the shunt resistor, R_SHUNT (in this case, a two-pin shunt). The
differential input and the high common-mode transient immunity of the AMC1200-Q1 ensure reliable and
accurate operation even in high-noise environments (such as the power stage of the traction inverter).
Floating
HV+ ^{Power Supply}
Isolation
Barrier
To Load
R_SHUNT
Gated
Drive
Circuit
Power
Supply
Gated
Drive
Circuit
R₁
D₁
R₂
5.1 V 12 W
R₃
12 W
C₂₍₁₎
330 pF
C₃
10 pF
(Optional)
C₁₍₁₎
0.1 mF
C₄
10 pF
(Optional)
AMC1200-Q1
VDD1 VDD2
VINP VOUTP
C₅₍₁₎
0.1 mF
VINN VOUTN
GND1 GND2
TMC320
C/F28xxx
ADC
HV-
(1) Place these capacitors as close as possible to the AMC1200-Q1.
Figure 32. Typical Application Diagram
Additionally, the AMC1200-Q1 can also be used for isolated voltage measurement of the dc-link as described in
the Isolated Voltage Measurement section.
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