AD8217

Rev. 0 | Page 12 of 16

APPLICATIONS INFORMATION

HIGH-SIDE CURRENT SENSING

In this configuration, the shunt resistor is referenced to the

battery (see Figure 26). High voltage is present at the inputs

of the current sense amplifier. When the shunt is battery

referenced, the AD8217 produces a linear ground-referenced

analog output. The AD8217 includes an internal LDO, which

allows the part to be powered from the high voltage rail, with

no need for an additional standalone supply.

+IN

SHUNT

GND

–IN

ADC

4.5V

TO

80V

AD8217

OUT

Figure 26. Battery-Referenced Shunt Resistor

MOTOR CONTROL CURRENT SENSING

The AD8217 is a practical, accurate solution for high-side

current sensing in motor control applications. In cases where

the shunt resistor is referenced to battery and the current

flowing is unidirectional (as shown in Figure 27), the AD8217

monitors the current with no additional supply pin necessary.

+IN

GND

–IN

BATTERY

MOTOR

AD8217

OUT

Figure 27. High-Side Current Sensing in Motor Control