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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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INA745AIRELR датащи(PDF) 13 Page - Texas Instruments |
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INA745AIRELR датащи(HTML) 13 Page - Texas Instruments |
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13 / 50 page  Temperature (C) -50 -25 0 25 50 75 100 125 150 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Figure 6-1. IS+ to IS– Package Resistance vs Temperature The internal compensation of the INA745x corrects for pin-to-pin resistance increases with temperature, achieving low drift over the ambient temperature range. The INA745x is most accurate when measuring currents around 15A to 20A. As currents increase, the error in the current measurement also increases. Figure 6-2 shows how the gain error of the INA745x varies with the shunt current for all device options. Shunt Current (A) 0 5 10 15 20 25 30 35 40 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 Figure 6-2. Gain Error vs Shunt Current The shape of this curve varies based on the PCB design. Designs with better thermal performance typically flatten this curve. The temperature coefficient of the shunt is compensated by sampling the junction temperature and internally applying a correction factor based on this temperature to the reported current measurements. During transient currents, the shunt heats faster than the temperature sensor. This temporary difference in temperatures results in higher values in the reported current until the temperature stabilizes. Figure 6-3 shows the sampled output response during a current step from 0A to 22.5A www.ti.com INA745A, INA745B SBOSAC3B – JULY 2023 – REVISED AUGUST 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 13 Product Folder Links: INA745A INA745B |
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