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, VIN+ and VIN–, 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 VSENSE and Common-Mode Voltage

The

accuracy

of

the

INA193A

current

shunt

monitors

is

a

function

of

two

main

variables:

VSENSE (VIN+ – VIN–) and common-mode voltage, VCM, relative to the supply voltage, VS. VCM is expressed as

(VIN+ + VIN–)/2; however, in practice, VCM is seen as the voltage at VIN+ because the voltage drop across VSENSE

is usually small.

8

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