PWM

Rejection

Shunt

Resistor

OUT

FB

REF

VS

GND

IS+

IS-

2.7V to 5.5V

+

–

EXT REF

Shunt Current

Alert

LOAD

GND

Rpullup

RFB1

RFB2

+

–

Op amp

0.1 F

R1

R2

IN-

IN+

Figure 6-7. Mid-Supply Voltage Output

6.4.2 Adjustable Gain Set Using External Resistors

The INA790x features adjustable gain with two external resistor network. The default gain is 20mV/A, and with

added external adjustable gain resistor network, total gain (G) can range up to 400mV/A. Figure 6-8 shows two

external resistors RFB1 and RFB2 configured for added external gain. Equation 2 can be used for calculating

external adjustable gain and Equation 3 shows the total gain of the system with external adjustable gain. The

REF pin and one end of resistor RFB2 is connected to external reference based on needed voltage at OUT pin as

described in Adjusting the Output With the Reference Pin.

PWM

Rejection

Shunt

Resistor

OUT

FB

REF

VS

GND

IS+

IS-

2.7V to 5.5V

+

–

External

Reference

Shunt Current

Alert

LOAD

GND

Rpullup

RFB1

RFB2

+

–

0.1 F

IN-

IN+

Figure 6-8. Adjustable Gain Setting With External Resistor Divider

Adjustable Gain= 1+RFB1RFB2

(2)

G=20mVA× 1+RFB1RFB2

(3)

INA790A, INA790B

SBOSAA6B – MAY 2024 – REVISED JULY 2025

www.ti.com

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