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LM234ZT Datasheet

  • LM234ZT

  • Three terminal adjustable current sources

  • 16頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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LM134-LM234-LM334
Three terminal adjustable current sources
Features
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鈻?/div>
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Operates from 1V to 40V
0.02%/V current regulation
Programmable from 1碌A(chǔ) to 10mA
鹵3% initial accuracy
Z
TO-92
(Plastic package)
Description
The LM134/LM234/LM334 are 3-terminal
adjustable current sources characterized by:
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an operating current range of 10000: 1
an excellent current regulation
a wide dynamic voltage range of 1V t 10V
D
SO-8
(Plastic micropackage)
The current is determined by an external resistor
without requiring other external components.
Reverse voltages of up to 20V will only draw a
current of several microamperes. This enables the
circuit to operate as a rectifier and as a source of
current in a.c. applications.
For the LM134/LM234/LM334, the voltage on the
control pin is 64mV at +25擄C and is directly
proportional to the absolute temperature (擄K). The
simplest external resistor connection generates a
current with approximately 0.33%/擄C temperature
dependence. Zero drift can be obtained by adding
an additional resistor and a diode to the external
circuit.
Pin connections
TO-92
(Bottom view)
v+
2
ADJ
1
v-
3
SO-8
(Top view)
NC
8
NC
7
V-
6
NC
5
1
ADJ
2
NC
3
NC
4
V+
May 2007
Rev 3
1/16
www.st.com
16

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