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 low input voltage range, low nonlinearity, and low temperature drift make the AMC3302 a high-performance

solution for industrial applications where shunt-based current sensing with high common-mode voltage levels is

required. The integrated isolated DC/DC converter offers additional flexibility for placement of the shunt and the

AMC3302, enabling system layout optimization and smaller printed circuit board (PCB) size comparing to

solutions based on discrete components.

8.2 Typical Application

Isolated amplifiers are widely used for shunt-based current measurements in high-voltage applications that must

be isolated from a low-voltage domain. Typical applications are phase current measurements in motor and servo

drives or solar inverters, or DC current measurements at the output of a power factor correction (PFC) stage or

DC/DC converter. The AMC3302 integrates an isolated power supply for the high-voltage side and therefore is

particularly easy to use in applications that do not have a high-side supply readily available or where a high-side

supply is referenced to a different ground potential than the signal to be measured.

Figure 8-1 shows a simplified schematic using the AMC3302 to measure the phase current in the output stage of

a solar inverter. At this location in the system, there is no supply readily available for powering the isolated

amplifier. The integrated isolated power supply solves this problem and, together with its bipolar input voltage

range, makes the AMC3302 ideally suited for AC current sensing. In this example, the AC line-voltage is sensed

by the AMC3302 on the grid-side where there is also no suitable supply available for powering the isolated

amplifier. The integrated power supply, high input impedance, and bipolar input voltage range of the AMC3302

makes the device ideally suited for grid-side AC voltage sensing applications.

AMC3302

SBASA11 – AUGUST 2020

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