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参数资料
| 型号： | LM234H/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, MBCY3 |
| 封装： | METAL CAN, TO-46, 3 PIN |
| 文件页数： | 1/14页 |
| 文件大小： | 759K |
| 代理商： | LM234H/NOPB |
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 ad-
dition, 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
accuracy. 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 1A 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
SO-8 Alternative Pinout
Surface Mount Package
00569724
Order Number LM334M or LM334MX
See NS Package Number M08A
00569725
Order Number LM334SM or LM334SMX
See NS Package Number M08A
TO-46
Metal Can Package
TO-92 Plastic Package
00569712
V Pin is electrically connected to case.
Bottom View
Order Number LM134H,
LM234H or LM334H
See NS Package
Number H03H
00569710
Bottom View
Order Number LM334Z, LM234Z-3 or LM234Z-6
See NS Package Number Z03A
March 2005
LM134/LM234/LM334
3-T
erminal
Adjustable
Current
Sources
2005 National Semiconductor Corporation
DS005697
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM234S8 | 制造商:Linear Technology 功能描述: |
| LM234Z | 功能描述:基准电压& 基准电流 3-Term Adjust Currnt RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM234Z | 制造商:STMicroelectronics 功能描述:IC - Adjustable Current Source |
| LM234Z-3 | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM234Z-3/NOPB | 功能描述:基准电压& 基准电流 3-TERM ADJ CURRENT SOURCE RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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