AD8219 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
AD8219 Datasheet PDF : 12 Pages
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APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSING
In this configuration, the shunt resistor is referenced to the
battery (see Figure 28). High voltage is present at the inputs
of the current sense amplifier. When the shunt is battery
referenced, the AD8219 produces a linear ground referenced
analog output.
ILOAD
4V
SHUNT
TO
LOAD
80V
+IN
–IN
AD8219
VS
OUT
GND
Figure 28. Battery Referenced Shunt Resistor
Figure 28 shows the supply pin, VS, connected directly to the
positive input (+IN) pin. In this mode, the internal LDO powers
the AD8219 as long as the common-mode voltage at the input
pins is 4 V to 80 V. Additionally, VS can also be connected to a
standalone supply that can vary from 4 V to 80 V as shown in
Figure 29.
ILOAD
4V
TO
80V
SHUNT
LOAD
+IN
–IN
AD8219
4V
VS
OUT
TO
GND
80V
Figure 29. Standalone Supply Operation
AD8219
MOTOR CONTROL CURRENT SENSING
The AD8219 is a practical, accurate solution for high-side
current sensing in motor control applications. In cases where
the shunt resistor is referenced to a battery and the current
flowing is unidirectional (as shown in Figure 30), the AD8219
monitors the current with no additional supply pin necessary
provided the battery voltage in the following circuit is in the 4 V
to 80 V range.
BATTERY
IMOTOR
+IN
–IN
AD8219
VS
OUT
GND
MOTOR
Figure 30. High-Side Current Sensing in Motor Control
Rev. A | Page 11 of 12
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