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LM3911 Datasheet Temperature Controller

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM3911 Temperature Controller June 1994 LM3911 Temperature Controller General.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

The LM3911 is a highly accurate temperature measurement and or control system for use over a b25 C to a 85 C temperature 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 internal 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 transverses 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 6 8V voltage reference 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 impedance is used Further the output collector can be returned to a voltage higher than 6 8V 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 basic temperature sensitive element Since this output depends 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 device 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 C to a 85 C temperature range

Key Features

  • Y Y Y Y Y Y Y Uncalibrated accuracy g 10 C Internal op amp with frequency compensation Linear output of 10 mV K (10 mV C) Can be calibrated in degrees Kelvin Celsius or Fahrenheit Output can drive loads up to 35V Internal stable voltage reference Low cost Block Diagram Typical.

More Datasheets from National Semiconductor (now Texas Instruments)

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LM390 LM390 1W Battery Operated Audio Power Amplifier
LM3900 Quad Amplifiers
LM3901 Quad Amplifiers
LM3905 Precision Timers
LM3909 LM3909 LED Flasher/Oscillator

LM3911 Distributor