Datasheet

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 10Ω. 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 10Ω 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
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Product Folder Links: INA210 INA211 INA212 INA213 INA214