INA181A2IDBVT datasheet(29/43 Pages) TI1

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Transorb

Output

IN±

IN+

GND

OUT

REF

INA181

< 10

2.7 V to 5.5 V

CBYPASS

0.1 µF

RSENSE

Bus Supply

±0.2 V to +26 V

Load

IN±

IN+

GND

OUT

REF

INA181

2.7 V to 5.5 V

Output

RPROTECT

< 10

RSENSE

Bus Supply

±0.2 V to +26 V

Load

CBYPASS

0.1 µF

INA181, INA2181, INA4181

www.ti.com

SBOS793B – APRIL 2017 – REVISED NOVEMBER 2017

Product Folder Links: INA181 INA2181 INA4181

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10 Power Supply Recommendations

The input circuitry of the INAx181 accurately measures beyond the power-supply voltage, VS. For example, VS

can be 5 V, whereas the bus supply voltage at IN+ and IN– can be as high as 26 V. However, the output voltage

range of the OUT pin is limited by the voltages on the VS pin. The INAx181 also withstand the full differential

input signal range up to 26 V at the IN+ and IN– input pins, regardless of whether or not the device has power

applied at the VS pin.

10.1 Common-Mode Transients Greater Than 26 V

With a small amount of additional circuitry, the INAx181 can be used in circuits subject to transients higher than

26 V, such as automotive applications. Use only Zener diodes or Zener-type transient absorbers (sometimes

referred to as transzorbs)—any other type of transient absorber has an unacceptable time delay. Start by adding

a pair of resistors as a working impedance for the Zener diode; see Figure 48. Keep these resistors as small as

possible; most often, around 10

Ω. Larger values can be used with an effect on gain that is discussed in the

Signal Filtering section. This circuit limits only short-term transients; therefore, many applications are satisfied

with a 10-

Ω resistor along with conventional Zener diodes of the lowest acceptable power rating. This

combination uses the least amount of board space. These diodes can be found in packages as small as SOT-

523 or SOD-523.

Figure 48. Transient Protection Using Dual Zener Diodes

In the event that low-power Zener diodes do not have sufficient transient absorption capability, a higher-power

transzorb must be used. The most package-efficient solution involves using a single transzorb and back-to-back

diodes between the device inputs, as shown in Figure 49. The most space-efficient solutions are dual, series-

connected diodes in a single SOT-523 or SOD-523 package. In either of the examples shown in Figure 48 and

Figure 49, the total board area required by the INAx181 with all protective components is less than that of an

SO-8 package, and only slightly greater than that of an MSOP-8 package.

Figure 49. Transient Protection Using a Single Transzorb and Input Clamps

For more information, see Current Shunt Monitor With Transient Robustness Reference Design.

INA181A2IDBVT Datasheet(PDF) 29 Page - Texas Instruments

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