LM334
- Operates From 1V to 40V
- 0.02%/V Current Regulation
- Programmable From 1µA to 10mA
- True 2-Terminal Operation
- Available as Fully Specified Temperature Sensor
- ±3% Initial Accuracy
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The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent 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 addition, 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°C and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with ≈+0.33%/°C temperature 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 ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.
The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | LM134/LM234/LM334 3-Terminal Adjustable Current Sources 数据表 (Rev. E) | 2013-6-20 | |||
| 应用手册 | 使用电压基准的精密电流源和电流阱 | PDF | HTML | PDF | HTML | 2026-4-20 | ||
| 更多文献资料 | 使用电压基准进行设计的提示和技巧 (Rev. A) | 2021-5-7 | ||||
| 电子书 | Tips and tricks for designing with voltage references (Rev. A) | 2021-5-7 | ||||
| 电子书 | 电压监测仪和电压检测器：提示、技巧和基础知识 | 英语版 | 2019-8-28 | |||
| 应用手册 | AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) | 2013-5-6 | ||||
| 应用手册 | AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) | 2013-4-29 | ||||
| 应用手册 | AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) | 2013-4-23 | ||||
| 应用手册 | TO-92 Packing Options / Ordering Instructions (Rev. A) | 2010-6-23 | ||||
| 应用手册 | Applying a New Precision Op Amp | 2004-10-4 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt Voltage Reference External Resistor Quick Start Calculator
该外部电阻器快速入门计算器工具支持您根据电压基准、电源和负载电流限值轻松计算有效的外部电阻值。根据这些输入，您可以马上查看计算结果并通过以颜色标记的指示了解计算出的输出是否有效。
TIDA-00500 — 用于 PLC 模块且基于电容器的备用电源参考设计
TIDA-00500 作为参考设计，用于在发生电源中断后在短时间内为负载供电。传统上，可编程逻辑控制器 (PLC) 配备了可充电电池源来提供替代电源。这种电池源通常存在充电拓扑复杂、充电时间长、需要定期维护和引发生态危险等缺点。如果在电源中断后需要使 PLC 在短时间内正常工作，那么使用基于电容器的备用电源是一种更简单、更高效的方法，因为相较于基于电池的解决方案，前者的功率密度更高。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| WAFERSALE (YS) | — | Ultra Librarian |
| TO-92 (LP) | 3 | Ultra Librarian |