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LM20CIM7X bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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LM20CIM7X bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 18 page LM20 SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013 www.ti.com Typical Performance Characteristics Temperature Error vs Temperature Figure 3. PCB LAYOUTS USED FOR THERMAL MEASUREMENTS Figure 4. Layout Used For No Heat Sink Measurements Figure 5. Layout Used For Measurements With Small Heat Sink LM20 Transfer Function The LM20 transfer function can be described in different ways with varying levels of precision. A simple linear transfer function, with good accuracy near 25°C, is VO = −11.69 mV/°C × T + 1.8663 V (1) Over the full operating temperature range of −55°C to 130°C, best accuracy can be obtained by using the parabolic transfer function. VO = (−3.88×10 −6×T2) + (−1.15×10−2×T) + 1.8639 (2) solving for T: (3) A linear transfer function can be used over a limited temperature range by calculating a slope and offset that give best results over that range. A linear transfer function can be calculated from the parabolic transfer function of the LM20. The slope of the linear transfer function can be calculated using the following equation: m = −7.76 × 10 −6× T − 0.0115, (4) 6 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM20 |
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