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LM2902LV-Q1 Datasheet(PDF) 17 Page - Texas Instruments |
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LM2902LV-Q1 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 38 page  Using Equation 2, RSHUNT is calculated to be 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is amplified by the LM290xLV-Q1 device to produce an output voltage of approximately 0 V to 3.5 V. The gain needed by the LM290xLV-Q1 to produce the necessary output voltage is calculated using Equation 3: _ _ _ _ OUT MAX OUT MIN IN MAX IN MIN V V Gain V V (3) Using Equation 3, the required gain is calculated to be 35 V/V, which is set with resistors RF and RG. Equation 4 sizes the resistors RF and RG, to set the gain of the LM290xLV-Q1 device to 35 V/V. F G R Gain 1 R (4) 8.2.3 Application Curve Selecting RF as 255 kΩ and RG as 7.5 kΩ provides a combination that equals 35 V/V. Figure 8-2 shows the measured transfer function of the circuit shown in Figure 8-1. 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. ILOAD (A) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.5 1 1.5 2 2.5 3 3.5 Outp Figure 8-2. Low-Side, Current-Sense Transfer Function www.ti.com LM2902LV-Q1, LM2904LV-Q1 SBOS987B – AUGUST 2020 – REVISED OCTOBER 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 17 Product Folder Links: LM2902LV-Q1 LM2904LV-Q1 |
Similar Part No. - LM2902LV-Q1_V02 |
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Similar Description - LM2902LV-Q1_V02 |
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