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Table 8-3. Design Parameters

DESIGN PARAMETERS

EXAMPLE VALUE

INAx290 supply voltage

5 V

High-side supply voltage

5 V

Maximum sense current (IMAX)

5 A

Gain option

50 V/V

8.2.2 Detailed Design Procedure

The maximum value of the current-sense resistor is calculated based choice of gain, value of the maximum

current the be sensed (IMAX), and the power-supply voltage (VS). When operating at the maximum current, the

output voltage must not exceed the positive output swing specification, VSP. Under the given design parameters,

Equation 6 calculates the maximum value for RSENSE as 19.2 mΩ.

SENSE

MAX

GAIN

(6)

For this design example, a value of 15 mΩ is selected because, while the 15 mΩ is less than the maximum value

calculated, 15 mΩ is still large enough to give adequate signal at the current-sense amplifier output.

8.2.2.1 Overload Recovery With Negative VSENSE

The INAx290 is a unidirectional current-sense amplifier that is meant to operate with a positive differential input

voltage (VSENSE). If negative VSENSE is applied, the device is placed in an overload condition and requires time to

recover once VSENSE returns positive. The required overload recovery time increases with more negative

VSENSE.

8.2.3 Application Curve

Figure 8-3 shows the output response of the device to a high frequency sinusoidal current.

Time (10Ps/div)

INA290A2 VOUT (1 V/div)

VSENSE (20 mV/div)

Figure 8-3. INAx290 Output Response

INA290, INA2290

SBOS961B – JUNE 2020 – REVISED DECEMBER 2020

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