Datasheet

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
INA199A1, INA199B1
INA199A2, INA199B2
INA199A3, INA199B3
SBOS469D –MAY 2009–REVISED NOVEMBER 2012 www.ti.com
USING THE INA199 WITH COMMON-MODE TRANSIENTS ABOVE 26V
With a small amount of additional circuitry, the INA199 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 24 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 limits 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 24. INA199 Transient Protection Using Dual Zener Diodes
14 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated
Product Folder Links: INA199A1 INA199B1 INA199A2 INA199B2 INA199A3 INA199B3