INA21x

V+

OUT

GND

IN-

IN+

C

BYPASS

Shutdown

Control

REF

Reference

Voltage

Supply

Load

R

SHUNT

Output

1MW

R

PROTECT

10W

R

PROTECT

10W

R

3

1MW

R

4

INA210, INA211

INA212, INA213

INA214

SBOS437E – MAY 2008 – REVISED JUNE 2013

www.ti.com

USING THE INA210 WITH COMMON-MODE TRANSIENTS ABOVE 26V

With a small amount of additional circuitry, the INA210-INA214 series can be used in circuits subject to transients

higher than 26V, such as automotive applications. Use only zener diode 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 shown in Figure 27 as a working impedance for the zener. It is desirable to

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 section on input filtering. Because this circuit is limiting only short-term transients,

many applications are satisfied with a 10

Ω resistor along with conventional zener diodes of the lowest power

rating that can be found. 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 27. INA210-INA214 Transient Protection Using Dual Zener Diodes

14

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