LMP8480, LMP8481

SNVS829C – MARCH 1999 – REVISED SEPTEMBER 2015

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9 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.

9.1 Application Information

The LMP848x amplifies the voltage developed across a current-sensing resistor when current passes through it.

Flexible offset inputs allow adjusting the functionality of the output for multiple configurations, as discussed

throughout this section.

9.1.1 Input Common-Mode and Differential Voltage Range

The input common-mode range, where “common-mode range” is defined as the voltage from ground to the

introduce severe gain error and nonlinearities.

less. The theoretical maximum input is 700 mV (14 V / 20).

Taking the inputs below 4 V will not damage the device, but the output conditions during this time are not

predictable and are not ensured.

If the load voltage (Vcm) is expected to fall below 4 V as part of normal operation, preparations must be made for

invalid output levels during this time.

9.2 Typical Applications

9.2.1 Unidirectional Application With LMP8480

Figure 27. Unidirectional Application with LMP8480

9.2.1.1 Design Requirements

The LMP8480 is designed for unidirectional current sense applications. The output of the amplifier will be equal

to the differential input voltage times the fixed device gain.

9.2.1.2 Detailed Design Procedure

The output voltage can be calculated from:

(9)

18

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