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LM3911H-46 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3911H-46 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 8 page  TLH5701 June 1994 LM3911 Temperature Controller General Description The LM3911 is a highly accurate temperature measurement andor control system for use over a b25 Cto a85 C tem- perature range Fabricated on a single monolithic chip it includes a temperature sensor a stable voltage reference and an operational amplifier The output voltage of the LM3911 is directly proportional to temperature in degrees Kelvin at 10 mV K Using the inter- nal op amp with external resistors any temperature scale factor is easily obtained By connecting the op amp as a comparator the output will switch as the temperature trans- verses the set-point making the device useful as an on-off temperature controller An active shunt regulator is connected across the power leads of the LM3911 to provide a stable 68V voltage refer- ence for the sensing system This allows the use of any power supply voltage with suitable external resistors The input bias current is low and relatively constant with temperature ensuring high accuracy when high source im- pedance is used Further the output collector can be re- turned to a voltage higher than 68V allowing the LM3911 to drive lamps and relays up to a 35V supply The LM3911 uses the difference in emitter-base voltage of transistors operating at different current densities as the ba- sic temperature sensitive element Since this output de- pends only on transistor matching the same reliability and stability as present op amps can be expected The LM3911 is available in two package styles a metal can TO-46 and an 8-lead epoxy mini-DIP In the epoxy package all electrical connections are made on one side of the de- vice allowing the other 4 leads to be used for attaching the LM3911 to the temperature souce The LM3911 is rated for operation over a b25 Cto a85 C temperature range Features Y Uncalibrated accuracy g10 C Y Internal op amp with frequency compensation Y Linear output of 10 mV K (10 mV C) Y Can be calibrated in degrees Kelvin Celsius or Fahrenheit Y Output can drive loads up to 35V Y Internal stable voltage reference Y Low cost Block Diagram Typical Applications Ground Referred Centigrade Thermometer Trims out initial zener tolerance Set output to read C Basic Temperature Controller Output goes negative on temperature increase RSe(Vab68V) kX Proportioning Temperature Controller Note 1 C1 determines proportioning frequency f 1 2R4 C1 Note 2 R10 e l Va l a lVbl b 7V 00015A Note 3 Either Vb or Va can be ground TLH5701 – 1 C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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