7.2.1 Design Requirements

VSUPPLY is set to 5V and the common-mode voltage set to 54V. Table 7-3 lists the design setup for this

application.

Table 7-3. Design Parameters

DESIGN PARAMETERS

EXAMPLE VALUE

INA950-SEP supply voltage

5V

High-side supply voltage

5V

Maximum sense current (IMAX)

5A

Gain option

20V/V

7.2.2 Detailed Design Procedure

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

maximum current to 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 48mΩ.

SP

SENSE

MAX

V

R

<

I

GAIN

u

(6)

Although 45.3mΩ is less than the maximum value calculated, 45.3mΩ is selected for this design example

because this value is still large enough to provide an adequate signal at the current-sense amplifier output and is

a standard 1% value.

7.2.2.1 Overload Recovery With Negative VSENSE

The INA950-SEP 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 when VSENSE returns positive. The required overload recovery time increases with more negative

VSENSE.

7.2.3 Application Curve

Figure 7-3 shows the output response of the device to a high-frequency sinusoidal current.

Time (10 s/div)

INA950 VOUT (0.4 V/div)

VSENSE (20 mV/div)

Figure 7-3. INA950-SEP Output Response

INA950-SEP

SBOSAK8 – MARCH 2025

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