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INA296A Datasheet(PDF) 24 Page - Texas Instruments |
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INA296A Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 43 page  • IMIN is the minimum current that will flow through RSENSE. • GAIN is the gain of the current-sense amplifier. • VSN is the negative output swing of the device as specified in the Specifications. Table 9-1 shows an example of the different results obtained from using five different gain versions of the INA296x. From the table data, the highest gain device allows a smaller current-shunt resistor and decreased power dissipation in the element. Table 9-1. RSENSE Selection and Power Dissipation(1) PARAMETER EQUATION RESULTS AT VS = 5 V A1, B1 DEVICES A2, B2 DEVICES A3, B3 DEVICES A4, B4 DEVICES A5, B5 DEVICES G Gain 10 V/V 20 V/V 50 V/V 100 V/V 200 V/V VSENSE Ideal differential input voltage VSENSE = VOUT / G 500 mV 250 mV 100 mV 50 mV 25 mV RSENSE Current sense resistor value RSENSE = VSENSE / IMAX 50 mΩ 25 mΩ 10 mΩ 5 mΩ 2.5 mΩ PSENSE Current-sense resistor power dissipation RSENSE × IMAX2 5 W 2.5 W 1 W 0.5 W 0.25 W (1) Design example with 10 A full-scale current with maximum output voltage set to 5 V. 9.2 Typical Application The INA296x is a bidirectional, current-sense amplifier capable of measuring currents through a resistive shunt with common-mode voltages from –5 V to +110 V. 9.2.1 Current Sensing in a Solenoid Application 22 V INA OUT IN+ IN– V S GND REF2 REF1 5 V 50 m Control Figure 9-1. Solenoid Drive Application Circuit 9.2.1.1 Design Requirements In this example application, the common-mode voltage ranges from 0 V to 22 V. The maximum sense current is 1.25 A, and a 5-V supply is available for the INA296x. Following the design guidelines from RSENSE and Device Gain Selection, a RSENSE of 50 mΩ and a gain of 20 V/V are selected to provide good output dynamic range. Table 9-2 lists the design setup for this application. Table 9-2. Design Parameters DESIGN PARAMETERS EXAMPLE VALUE Power supply voltage 5 V Common mode voltage range 0 V to 22 V Maximum sense current 1.25 A RSENSE resistor 50 mΩ INA296A, INA296B SBOSA04C – MARCH 2022 – REVISED OCTOBER 2023 www.ti.com 24 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: INA296A INA296B |
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