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| AMC1100_15 Datasheet, PDF (16/33 Pages) Texas Instruments – AMC1100 Fully-Differential Isolation Amplifier | |||
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AMC1100
SBAS562A â APRIL 2012 â REVISED DECEMBER 2014
Typical Applications (continued)
Phase
Isolation
Barrier
R1
RSHUNT
R2
12 W
R3
12 W
C1(1)
0.1 mF
C2(1)
330 pF
C3
10 pF
(optional)
C4
10 pF
(optional)
Device
1 VDD1 VDD2 14
2
13
VINP VOUTP
3 VINN VOUTN 11
4 GND1 GND2 9
C5(1)
0.1 mF R
R
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TMC320
C/F28xxx
C
ADC
Figure 34. Shunt-Based Current Sensing with the AMC1100
The isolated voltage measurement can be performed as described in the Device Functional Modes section.
8.2.1.2 Detailed Design Procedure
The floating ground reference (GND1) is derived from the end of the shunt resistor, which is connected to the
negative input of the AMC1100 (VINN). If a four-terminal shunt is used, the inputs of the AMC1100 are
connected to the inner leads and GND1 is connected to one of the outer shunt leads. The differential input of the
AMC1100 ensures accurate operation even in noisy environments.
The differential output of the AMC1100 can either directly drive an analog-to-digital converter (ADC) input or can
be further filtered before being processed by the ADC.
8.2.1.3 Application Curve
In frequency inverter applications the power switches must be protected in case of an overcurrent condition. To
allow fast powering off of the system, low delay caused by the isolation amplifier is required. Figure 35 shows the
typical full-scale step response of the AMC1100.
500 mV/div
200 mV/div
500 mV/div
Time (2 ms/div)
Figure 35. Typical Step Response of the AMC1100
16
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