Pulse Duration (s)

0

50

100

150

200

250

300

350

400

450

500

10m

100m

1

10

100

1000

TA = 25°C

TA = 125°C

Figure 6-3. Maximum Pulse Current vs Pulse Duration (Single Event)

6.3.4 Temperature Drift Correction

System calibration is common for many industrial applications to eliminate initial component and system-level

errors that can be present. A system-level calibration reduces the initial accuracy requirement for many of

the individual components because the errors associated with these components are effectively eliminated

through the calibration procedure. This calibration enables precise measurements at the temperature in which

the system is calibrated. As the system temperature changes because of external ambient changes or self

heating, measurement errors are reintroduced. Without accurate temperature compensation used in addition to

the initial adjustment, the calibration procedure is not effective. The user must account for temperature-induced

changes. The built-in programmed temperature compensation in the INA790x (including both the integrated

current-sensing resistor and current-sensing amplifier) keep the device measurement accurate, even when the

temperature changes throughout the specified temperature range of the device.

6.3.5 Enhanced PWM Rejection Operation

The enhanced PWM rejection feature of the INA790x provides increased attenuation of large common-mode

ΔV/Δt transients. Large ΔV/Δt common-mode transients associated with PWM signals are employed in

applications such as motor or solenoid drive and switching power supplies. The disturbances that can occur

at the output of a current sense amplifier from common-mode transients causes erroneous measurements

and impose limitations when the output is valid. The INA790x is designed with high common-mode rejection

techniques to reduce large ΔV/Δt transients before the system is disturbed. As a result, this makes system

design simple with INA790x . The high AC CMRR, in conjunction with signal bandwidth, allows the INA790x to

minimize output disturbances and ringing during common-mode transitions when compared against traditional

current-sensing amplifiers. Figure 6-4 shows the INA790x PWM enhancement performance.

www.ti.com

INA790A, INA790B

SBOSAA6B – MAY 2024 – REVISED JULY 2025

Copyright © 2025 Texas Instruments Incorporated

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