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參數(shù)資料
| 型號： | LM234D |
| 廠商： | 意法半導體 |
| 英文描述： | THREE TERMINAL ADJUSTABLE CURRENT SOURCES |
| 中文描述： | 三端可調電流源 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 273K |
| 代理商： | LM234D |
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
±
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 25C and is directly proportional to abso-
lute temperature (K). The simplest one external resistor
connection, then, generates a current with
≈
+0.33%/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
±
3C and
±
6C, 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
55C to +125C, the LM234 from 25C to +100C and the
LM334 from 0C to +70C. These devices are available in
TO-46 hermetic, TO-92 and SO-8 plastic packages.
Features
n
Operates from 1V to 40V
n
0.02%/V current regulation
n
Programmable from 1μA to 10mA
n
True 2-terminal operation
n
Available as fully specified temperature sensor
n
±
3% initial accuracy
Connection Diagrams
SO-8
Surface Mount Package
DS005697-24
Order Number LM334M or
LM334MX
See NS Package Number M08A
SO-8 Alternative Pinout
Surface Mount Package
DS005697-25
Order Number LM334SM or
LM334SMX
See NS Package Number M08A
TO-46
Metal Can Package
DS005697-12
V
Pin is electrically connected to case.
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
March 2000
L
2000 National Semiconductor Corporation
DS005697
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM234DT | 功能描述:板上安裝溫度傳感器 3-Term Adjust Currnt RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM234DT-CUT TAPE | 制造商:ST 功能描述:LM234 Series 40 V 10 mA Three Terminal Adjustable Current Sources - SOIC-8 |
| LM234H | 制造商:nat'l 功能描述: |
| LM234H6 | 制造商:Linear Technology 功能描述:Constant Current Source and Temperature Sensor 3-Pin TO-46 |
| LM234H-6 | 制造商:Linear Technology 功能描述:Constant Current Source and Temperature Sensor 3-Pin TO-46 |
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