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データシートサーチシステム |
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OPA991 データシート(PDF) 33 Page - Texas Instruments |
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OPA991 データシート(HTML) 33 Page - Texas Instruments |
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33 / 59 page  ILOAD (A) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 1 2 3 4 5 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 33 OPA991, OPA2991, OPA4991 www.ti.com SBOS969B – OCTOBER 2019 – REVISED MAY 2020 Product Folder Links: OPA991 OPA2991 OPA4991 Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated Typical Applications (continued) 8.2.1.2 Detailed Design Procedure The transfer function of the circuit in Figure 53 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 defined 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 OPA991 to produce an output voltage of 0 V to 4.9 V. The gain needed by the OPA991 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 is used to size the resistors, RF and RG, to set the gain of the OPA991 to 49 V/V. (4) Choosing RF as 360 kΩ, RG is calculated to be 7.5 kΩ. RF and RG were chosen as 360 kΩ and 7.5 kΩ because they are standard value resistors that create a 49:1 ratio. Other resistors that create a 49:1 ratio can also be used. Figure 54 shows the measured transfer function of the circuit shown in Figure 53. 8.2.1.3 Application Curves Figure 54. Low-Side, Current-Sense, Transfer Function |
同様の部品番号 - OPA991_V01 |
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同様の説明 - OPA991_V01 |
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