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LM134 Datasheet

  • LM134

  • 3-Terminal Adjustable Current Sources

  • 276.57KB

  • 14頁

  • NSC

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LM134/LM234/LM334 3-Terminal Adjustable Current Sources
March 2000
LM134/LM234/LM334
3-Terminal Adjustable Current Sources
General Description
The LM134/LM234/LM334 are 3-terminal adjustable current
sources featuring 10,000:1 range in operating current, excel-
lent current regulation and a wide dynamic voltage range of
1V to 40V. Current is established with one external resistor
and no other parts are required. Initial current accuracy is
鹵
3%. The LM134/LM234/LM334 are true floating current
sources with no separate power supply connections. In addi-
tion, reverse applied voltages of up to 20V will draw only a
few dozen microamperes of current, allowing the devices to
act as both a rectifier and current source in AC applications.
The sense voltage used to establish operating current in the
LM134 is 64mV at 25藲C and is directly proportional to abso-
lute temperature (藲K). The simplest one external resistor
connection, then, generates a current with
鈮?0.33%/藲C
tem-
perature dependence. Zero drift operation can be obtained
by adding one extra resistor and a diode.
Applications for the current sources include bias networks,
surge protection, low power reference, ramp generation,
LED driver, and temperature sensing. The LM234-3 and
LM234-6 are specified as true temperature sensors with
guaranteed initial accuracy of
鹵
3藲C and
鹵
6藲C, respectively.
These devices are ideal in remote sense applications be-
cause series resistance in long wire runs does not affect ac-
curacy. In addition, only 2 wires are required.
The LM134 is guaranteed over a temperature range of
鈭?5藲C to +125藲C, the LM234 from 鈭?5藲C to +100藲C and the
LM334 from 0藲C to +70藲C. These devices are available in
TO-46 hermetic, TO-92 and SO-8 plastic packages.
Features
n
n
n
n
n
n
Operates from 1V to 40V
0.02%/V current regulation
Programmable from 1碌A(chǔ) to 10mA
True 2-terminal operation
Available as fully specified temperature sensor
鹵
3% initial accuracy
Connection Diagrams
SO-8
Surface Mount Package
SO-8 Alternative Pinout
Surface Mount Package
TO-46
Metal Can Package
DS005697-24
DS005697-12
DS005697-25
Order Number LM334M or
LM334MX
See NS Package Number M08A
Order Number LM334SM or
LM334SMX
See NS Package Number M08A
V Pin is electrically connected to case.
鈭?/div>
Bottom View
Order Number LM134H,
LM234H or LM334H
See NS Package
Number H03H
TO-92 Plastic Package
DS005697-10
Bottom View
Order Number LM334Z, LM234Z-3 or LM234Z-6
See NS Package Number Z03A
漏 2000 National Semiconductor Corporation
DS005697
www.national.com

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