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LM3911H-46 bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI) |
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LM3911H-46 bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Absolute Maximum Ratings If MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications Supply Current (Externally Set) 10 mA Output Collector Voltage Vaa 36V Feedback Input Voltage Range 0V to a70V Output Short Circuit Duration Indefinite Operating Temperature Range b 25 Cto a85 C Storage Temperature Range b 65 Cto a150 C Lead Temperature (Soldering 10 seconds) 260 C Electrical Characteristics (Note 1) Parameter Conditions Min Typ Max Units SENSOR Output Voltage TAeb25 C (Note 2) 236 248 260 V Output Voltage TAea25 C (Note 2) 288 298 308 V Output Voltage TAea85 C (Note 2) 346 358 370 V Linearity D Te100 C 05 2 % Long-Term Stability 03 % Repeatability 03 % VOLTAGE REFERENCE Reverse Breakdown Voltage 1 mAsIzs5 mA 655 685 725 V Reverse Breakdown Voltage 1 mAsIzs5mA 10 35 mV Change With Current Temperature Stability 20 85 mV Dynamic Impedance Ize1 mA 30 X RMS Noise Voltage 10 Hzsfs10 kHz 30 m V Long Term Stability TAea85 C 60 mV OP AMP Input Bias Current TAea25 C 35 150 nA Input Bias Current 45 250 nA Voltage Gain RLe36k Vaa e36V 2500 15000 VV Output Leakage Current TAe25 C (Note 3) 02 2 m A Output Leakage Current (Note 3) 10 8 m A Output Source Current VOUTs370 10 m A Output Sink Current 1VsVOUTs36V 20 mA Note 1 These specifications apply for b25 CsTAsa85 C and 09 mA sISUPPLYs11 mA unless otherwise specified CLs50 pF Note 2 The output voltage applies to the basic thermometer configuration with the output and input terminals shorted and a load resistance of t 10 MX This is the feedback sense voltage and includes errors in both the sensor and op amp This voltage is specified for the sensor in a rapidly stirred oil bath The output is referred to Va Note 3 The output leakage current is specified with t100 mV overdrive Since this voltage changes with temperature the voltage drive for turn-off changes and is defined as VOUT (with output and input shorted) b100 mV This specification applies for VOUTe36V Application Hints Although the LM3911 is designed to be totally trouble-free certain precautions should be taken to insure the best pos- sible performance As with any temperature sensor internal power dissipation will raise the sensor’s temperature above ambient Nominal suggested operating current for the shunt regulator is 10 mA and causes 70 mW of power dissipation In free still air this raises the package temperature by about 12 K Al- though the regulator will operate at higher reverse currents and the output will drive loads up to 50 mA these higher currents will raise the sensor temperature to about 19 K above ambient-degrading accuracy Therefore the sensor should be operated at the lowest possible power level With moving air liquid or surface temperature sensing self- heating is not as great a problem since the measured media will conduct the heat from the sensor Also there are many small heat sinks designed for transistors which will improve heat transfer to the sensor from the surrounding medium A small finned clip-on heat sink is quite effective in free-air It should be mentioned that the LM3911 die is on the base of the package and therefore coupling to the base is preferable The internal reference regulator provides a temperature sta- ble voltage for offsetting the output or setting a comparison point in temperature controllers However since this refer- ence is at the same temperature as the sensor temperature changes will also cause reference drift For application where maximum accuracy is needed an external reference should be used Of course for fixed temperature controllers the internal reference is adequate 2 |
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Mô tả tương tự - LM3911H-46 |
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