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LMV321A Datasheet(PDF) 18 Page - Texas Instruments |
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LMV321A Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 48 page  0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 I LOAD (A) C219 F G R Gain 1 R _ _ _ _ OUT MAX OUT MIN IN MAX IN MIN V V Gain V V _ _ SHUNT MAX SHUNT LOAD MAX V 100mV R 100m I 1A : OUT LOAD SHUNT V I R Gain u u 18 LMV321A, LMV324A, LMV358A SBOS923F – DECEMBER 2017 – REVISED JANUARY 2020 www.ti.com Product Folder Links: LMV321A LMV324A LMV358A Submit Documentation Feedback Copyright © 2017–2020, Texas Instruments Incorporated Typical Application (continued) 8.2.1.1 Design Requirements The design requirements for this design are: • Load current: 0 A to 1 A • Output voltage: 4.9 V • Maximum shunt voltage: 100 mV 8.2.1.2 Detailed Design Procedure The transfer function of the circuit in is given in Equation 1. (1) The load current (ILOAD) produces a voltage drop across the shunt resistor (RSHUNT). The load current is set from 0 A to 1 A. To keep the shunt voltage below 100 mV at maximum load current, the largest shunt resistor is shown using Equation 2. (2) Using Equation 2, RSHUNT is calculated to be 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is amplified by the LMV3xxA to produce an output voltage of approximately 0 V to 4.9 V. The gain needed by the LMV3xxA to produce the necessary output voltage is calculated using Equation 3. (3) Using Equation 3, the required gain is calculated to be 49 V/V, which is set with resistors RF and RG. Equation 4 sizes the resistors RF and RG, to set the gain of the LMV3xxA to 49 V/V. (4) Selecting RF as 57.6 kΩ and RG as 1.2 kΩ provides a combination that equals 49 V/V. Figure 33 shows the measured transfer function of the circuit shown in Figure 32. Notice that the gain is only a function of the feedback and gain resistors. This gain is adjusted by varying the ratio of the resistors and the actual resistors values are determined by the impedance levels that the designer wants to establish. The impedance level determines the current drain, the effect that stray capacitance has, and a few other behaviors. There is no optimal impedance selection that works for every system, you must choose an impedance that is ideal for your system parameters. 8.2.1.3 Application Curve Figure 33. Low-Side, Current-Sense Transfer Function |
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Similar Description - LMV321A_V02 |
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