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LM235 데이터시트(PDF) 10 Page - Texas Instruments |
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LM235 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 28 page LM135, LM135A, LM235, LM235A, LM335, LM335A SNIS160E – MAY 1999 – REVISED FEBRUARY 2015 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information To insure good sensing accuracy, several precautions must be taken. Like any temperature-sensing device, self- heating can reduce accuracy. The LM135 should be operated at the lowest current suitable for the application. Sufficient current, of course, must be available to drive both the sensor and the calibration pot at the maximum operating temperature as well as any external loads. If the sensor is used in an ambient where the thermal resistance is constant, self-heating errors can be calibrated out. This is possible if the device is run with a temperature-stable current. Heating will then be proportional to zener voltage and therefore temperature. This makes the self-heating error proportional to absolute temperature the same as scale factor errors. 8.2 Typical Application Figure 13. Basic Temperature Sensor 8.2.1 Design Requirements Table 1. Design Parameters PARAMETER EXAMPLE VALUE Accuracy at 25°C ±1°C Accuracy from –55 °C to 150 °C ±2.7°C Forward Current 1 mA Temperature Slope 10m V/K 8.2.2 Detailed Design Procedure For optimum accuracy, R1 is picked such that 1 mA flows through the sensor. Additional error can be introduced by varying load currents or varying supply voltage. The influence of these currents on the minimum and maximum reverse current flowing through the LM135 should be calculated and be maintained in the range of 0.4 mA to 5 mA. Minimizing the current variation through the LM135 will provide for the best accuracy. The Operating Output Voltage Change with Current specification can be used to calculate the additional error which could be up to 1 K maximum from the LM135A, for example. 10 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated Product Folder Links: LM135 LM135A LM235 LM235A LM335 LM335A |
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