INA193AIDBVR datasheet(10/24 Pages) TI1

Part #	INA193AIDBVR

Description	CURRENT SHUNT MONITOR ??6V to 80V Common-Mode Range

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R

S

A1

0.1 F

m

V+>3V

A2

R

L

Load

V

IN+

-16Vto+80V

Negative

and

Positive

Common-Mode

Voltage

V

IN+

V

IN-

V+

I

L

OUT

INA193-INA198

R

1

R

2

INA193, INA194

INA195, INA196

INA197, INA198

SBOS307F – MAY 2004 – REVISED FEBRUARY 2010

www.ti.com

SHUTDOWN

voltage loss in the measurement line. High values of

RS provide better accuracy at lower currents by

Because the INA193-INA198 consume a quiescent

minimizing the effects of offset, while low values of

current less than 1mA, they can be powered by either

RS minimize voltage loss in the supply line. For most

the output of logic gates or by transistor switches to

applications, best performance is attained with an RS

supply power. Use a totem-pole output buffer or gate

value that provides a full-scale shunt voltage range of

that can provide sufficient drive along with 0.1mF

50mV to 100mV. Maximum input voltage for accurate

bypass capacitor, preferably ceramic with good

measurements is 500mV.

high-frequency characteristics. This gate should have

a supply voltage of 3V or greater because the

TRANSIENT PROTECTION

INA193-INA198 requires a minimum supply greater

than 2.7V. In addition to eliminating quiescent current,

The

−16V to +80V common-mode range of the

this gate also turns off the 10mA bias current present

INA193-INA198 is ideal for withstanding automotive

at each of the inputs. An example shutdown circuit is

fault conditions ranging from 12V battery reversal up

shown in Figure 21.

to +80V transients, since no additional protective

components are needed up to those levels. In the

event

that

the

INA193-INA198

is

exposed

to

transients on the inputs in excess of its ratings, then

external transient absorption with semiconductor

transient absorbers (zeners or Transzorbs) will be

necessary.

Use

of

MOVs

or

VDRs

is

not

recommended except when they are used in addition

to a semiconductor transient absorber. Select the

transient absorber such that it will never allow the

INA193-INA198 to be exposed to transients greater

than +80V (that is, allow for transient absorber

tolerance, as well as additional voltage due to

transient absorber dynamic impedance). Despite the

use of internal zener-type ESD protection, the

INA193-INA198 does not lend itself to using external

resistors in series with the inputs because the internal

gain resistors can vary up to ±30%. (If gain accuracy

is not important, then resistors can be added in series

with the INA193-INA198 inputs with two equal

resistors on each input.)

OUTPUT VOLTAGE RANGE

The output of the INA193-INA198 is accurate within

the

output

voltage

swing

range

set

by

the

Figure 21. INA193-INA198 Example Shutdown

power-supply pin, V+. This is best illustrated when

Circuit

using the INA195 or INA198 (which are both versions

using a gain of 100), where a 100mV full-scale input

from the shunt resistor requires an output voltage

SELECTING RS

swing of +10V, and a power-supply voltage sufficient

to achieve +10V on the output.

The value chosen for the shunt resistor, RS, depends

on the application and is a compromise between

small-signal accuracy and maximum permissible

10

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Product Folder Link(s): INA193 INA194 INA195 INA196 INA197 INA198

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