INA180A2IDBVT datasheet(27/51 Pages) TI1

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Transorb

Output

IN±

IN+

GND

OUT

< 10

2.7 V to 5.5 V

CBYPASS

0.1 µF

RSENSE

Bus Supply

±0.2 V to +26 V

Load

Single-Channel

TI Device

IN±

IN+

GND

OUT

Single-Channel

TI Device

2.7 V to 5.5 V

Output

RPROTECT

< 10

RSENSE

Bus Supply

±0.2 V to +26 V

Load

CBYPASS

0.1 µF

INA180, INA2180, INA4180

www.ti.com

SBOS741G – APRIL 2017 – REVISED APRIL 2020

Product Folder Links: INA180 INA2180 INA4180

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10 Power Supply Recommendations

The input circuitry of the INAx180 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 INAx180 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 INAx180 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, as shown Figure 49. 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 49. 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 50. 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 49 and

Figure 50, the total board area required by the INAx180 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 50. Transient Protection Using a Single Transzorb and Input Clamps

INA180A2IDBVT 数据表(PDF) 27 Page - Texas Instruments

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