Temperature Controller PDIP-8 Type LM3911N
General Description
The LM3911 is a highly accurate temperature measurement
and/or control system for use over a -25°C to +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 -25°C to +85°C temperature range.
Features
> Uncalibrated accuracy +-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
Info as pdf-file
Type: LM3911N
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