Moteur de recherche de fiches techniques de composants électroniques |
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TMP709 Fiches technique(PDF) 7 Page - Texas Instruments |
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TMP709 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 15 page TMP709 www.ti.com SBOS583A – DECEMBER 2011 – REVISED FEBRUARY 2012 APPLICATION INFORMATION SET-POINT RESISTOR (RSET) The temperature threshold is set by connecting RSET from the SET pin to GND. The value of RSET can be determined using either Figure 2 or from Equation 1: RSET (kΩ) = 0.0012T 2 – 0.9308T + 96.147 Where T = temperature threshold in degree Celsius. (1) THERMAL CONSIDERATIONS The TMP709 quiescent current is typically 40 μA. The device dissipates negligible power when the output drives a high-impedance load. Thus, the die temperature is the same as the package temperature. In order to maintain accurate temperature monitoring, a good thermal contact should be provided between the TMP709 package and the device being monitored. The rise in die temperature as a result of self-heating is given by the following equation: ΔTJ = PDISS × θJA Where: PDISS = power dissipated by the device. θJA = package thermal resistance. Typical thermal resistance for SOT-23 package is 217.9°C/W. (2) To minimize the effects of self-heating, keep the output current at a minimum level. POWER-SUPPLY FILTERING Any significant noise on the VCC pin may result in a trip-point error. This noise can be minimized levels by low-pass filtering the device supply (VCC) using a 150-Ω resistor and a 0.1-μF capacitor. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TMP709 |
Numéro de pièce similaire - TMP709_15 |
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Description similaire - TMP709_15 |
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