RIN

R2

R1

L1

L2

G

=G

+

ERRTOT

ERR

R

2

R

IN

Time(2 s/div)

m

200mV/div

500mV/div

500mV/div

AMC1200, AMC1200B

www.ti.com

SBAS542D – APRIL 2011 – REVISED JULY 2015

Typical Applications (continued)

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 34 shows the

typical full-scale step response of the AMC1200.

Figure 34. Typical Step Response of the AMC1200

8.2.2 Isolated Voltage Measurement

The AMC1200 and AMC1200B can also be used for isolated voltage measurement applications, as shown in a

simplified way in Figure 35. In such applications, usually a resistor divider (R1 and R2 in Figure 35) is used to

match the relatively small input voltage range of the AMC device. R2 and the input resistance RIN of the

AMC1200 also create a resistance divider that results in additional gain error. With the assumption that R1 and

RIN have a considerably higher value than R2, the resulting total gain error can be estimated using Equation 1:

where

•

GERR = the gain error of AMC device.

(1)

Figure 35. Voltage Measurement Application

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