LM134
- 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.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | LM134/LM234/LM334 3-Terminal Adjustable Current Sources データシート (Rev. E) | 2013/06/20 | |||
| アプリケーション・ノート | 電圧リファレンスを使用した高精度電流ソースおよびシンク | PDF | HTML | PDF | HTML | 2026/04/20 | ||
| e-Book（PDF） | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 2019/06/28 | ||||
| アプリケーション・ノート | AN-211 New Op Amp Ideas (Rev. A) | 2013/05/06 | ||||
| アプリケーション・ノート | LB-41 Precision Reference Uses Only Ten Microamperes (Rev. B) | 2013/05/03 | ||||
| アプリケーション・ノート | AN-460 LM34/LM35 Precision Monolithic Temperature Sensors (Rev. C) | 2013/05/01 |
設計と開発
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SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt Voltage Reference External Resistor Quick Start Calculator
この外部抵抗クイック スタート カリキュレータ ツールを使用すると、電圧リファレンス、電源電圧、負荷電流の範囲を基準にして、外部抵抗の適切な値を素早く計算できます。これらの入力を使用すると、計算結果を素早く表示し、色分けされた表示を使用して、計算済みの出力が有効と無効のどちらであるかを判断できます。
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| TO-CAN (NDV) | 3 | Ultra Librarian |
| DIESALE (Y) | — | Ultra Librarian |