Datasheet

R
S
Load
I
S
V+
OUT
R
L
R
1
R
2
2.7 V to 18 V
-16 V to 80 V
V
IN+
V
IN-
V
IN+
INA193A
INA193A-EP
SBOS400A –MAY 2007–REVISED SEPTEMBER 2013 www.ti.com
APPLICATION INFORMATION
Basic Connection
Figure 1 shows the basic connection of INA193A. The input pins, V
IN+
and V
IN–
, should be connected as closely
as possible to the shunt resistor to minimize any resistance in series with the shunt resistance.
Power-supply bypass capacitors are required for stability. Applications with noisy or high impedance power
supplies may require additional decoupling capacitors to reject power supply noise. Connect bypass capacitors
close to the device pins.
Figure 1. INA193A Basic Connection
Power Supply
The input circuitry of the INA193A can accurately measure beyond its power supply voltage, V+. For example,
the V+ power supply can be 5 V, whereas the load power supply voltage is up to 80 V. The output voltage range
of the OUT terminal, however, is limited by the voltages on the power-supply pin.
Accuracy Variations as a Result of V
SENSE
and Common-Mode Voltage
The accuracy of the INA193A current shunt monitors is a function of two main variables:
V
SENSE
(V
IN+
– V
IN–
) and common-mode voltage, V
CM
, relative to the supply voltage, V
S
. V
CM
is expressed as
(V
IN+
+ V
IN–
)/2; however, in practice, V
CM
is seen as the voltage at V
IN+
because the voltage drop across V
SENSE
is usually small.
8 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: INA193A-EP