INA290 datasheet(19/27 Pages) TI1

Part #	INA290

Description	INA290 2.7-V to 120-V, 1.1-MHz, Ultra-Precise Current-Sense Amplifier in Small (SC-70) Package

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Time (10Ps/div)

INA290A2 VOUT (1 V/div)

VSENSE (20 mV/div)

SP

SENSE

MAX

V

R

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GAIN

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19

INA290

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SBOS961 – JUNE 2020

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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.

(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.

8.2.3 Overload Recovery With Negative VSENSE

The INA290 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.

8.2.4 Application Curve

Figure 40 shows the output response of the device to a high frequency sinusoidal current.

Figure 40. INA290 Output Response

9 Power Supply Recommendations

The input circuitry of the INA290 device can accurately measure beyond the power-supply voltage. The power

supply can be 20 V, whereas the load power-supply voltage at IN+ and IN– can go up to 120 V. The output

voltage range of the OUT pin is limited by the voltage on the VS pin and the device swing to supply specification.

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