INA138
- Complete Unipolar High-Side Current Measurement Circuit
- Wide Supply and Common-Mode Range
- INA138: 2.7 V to 36 V
- INA168: 2.7 V to 60 V
- Independent Supply and Input Common-Mode Voltages
- Single Resistor Gain Set
- Low Quiescent Current (25 µA Typical)
- Wide Temperature Range: –40°C to +125°C
- 5-Pin SOT-23 Package
The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.
Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.
The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.
Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | INA1x8 High-Side Measurement Current Shunt Monitor datasheet (Rev. E) | PDF | HTML | 2017/12/20 | ||
| 應用說明 | Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) | PDF | HTML | 2026/4/27 | |||
| Circuit design | High-voltage, high-side floating current sensing circuit using current output, c (Rev. A) | PDF | HTML | 2024/9/26 | |||
| 應用說明 | Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors (Rev. A) | PDF | HTML | 2022/3/21 | |||
| Application brief | Extending Beyond the Max Common-Mode Range of Discrete Current-Sense Amplifiers (Rev. A) | PDF | HTML | 2022/3/10 | |||
| 技術文章 | How to get started with current sense amplifiers – part 1 | PDF | HTML | 2015/5/19 | |||
| 類比設計期刊 | Harnessing wasted energy in 4- to 20-mA current-loop systems | 2012/9/25 | ||||
| 類比設計期刊 | 4Q 2012 Issue Analog Applications Journal | 2012/9/25 | ||||
| 類比設計期刊 | Q4 2008 Issue Analog Applications Journal | 2008/10/22 | ||||
| 使用指南 | UCC38C42 30-W Synchronous Buck Converter Reference Design | 2003/2/4 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。
除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。
CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool
CIRCUIT060032 — 使用電流輸出、電流感測放大器的高電壓、高壓側浮動電流感測電路
SGLC001 — Source Files for SBOA295
TIDA-00332 — 高電壓 12 V – 400 V DC 電流感測參考設計
此經驗證設計顯示了使用 INA138 測量高達 400V 共模電壓的電路。這是透過建立簡單的浮動電源供應器，並直接從高電壓來源對 INA138 進行偏壓來實現的。此設計中的 400V 為範例。使用不同元件，甚至可實現更高的共模電壓。此電路經過測試，包含 Gerber 檔案、測試結果和功能詳細說明。
TIDA-00799 — 具有低雜訊、低失真、DC 與 AC 輸入的四通道 12 位元 50 MSPS ADC 參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |