INA250
- Precision Integrated Shunt Resistor:
- Shunt Resistor: 2 mΩ
- Shunt Resistor Tolerance: 0.1% (Max)
- 15 A Continuous from –40°C to 85°C
- 0°C to 125°C Temperature Coefficient: 10 ppm/°C
- High Accuracy:
- Gain Error (Shunt and Amplifier): 0.3% (Max)
- Offset Current: 50 mA (Max, INA250A2)
- Four Available Gains:
- INA250A1: 200 mV/A
- INA250A2: 500 mV/A
- INA250A3: 800 mV/A
- INA250A4: 2 V/A
- Wide Common-Mode Range: –0.1 V to 36 V
- Specified Operating Temperature: –40°C to 125°C
The INA250 is a voltage-output, current-sensing amplifier family that integrates an internal shunt resistor to enable high-accuracy current measurements at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, low- or high-side current-shunt monitor that allows an external reference to be used to measure current flowing in both directions through the internal current-sensing resistor sensor. The integration of the precision current-sensing resistor provides calibration equivalent measurement accuracy with ultra-low temperature drift performance and ensures an optimized Kelvin layout for the sensing resistor is always obtained.
The INA250 family is available in four output voltage scales: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A. This device is fully tested and specified for continuous currents up to 10 amps at the maximum temperature of 125°C. The INA250 operates from a single 2.7-V to 36-V supply and draws a maximum of 300 µA of supply current. All INA250 gain versions are specified over the extended operating temperature range (–40°C to 125°C), and are available in a TSSOP-16 package.
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 | INA250 36-V, Bidirectional, Precision Current Sense Amplifier With Integrated Shunt Resistor datasheet (Rev. C) | PDF | HTML | 2023/9/13 | ||
| 應用說明 | Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers | PDF | HTML | 2024/11/18 | |||
| Application brief | Integrating the Current Sensing Resistor (Rev. D) | PDF | HTML | 2023/4/7 | |||
| 電子書 | An Engineer's Guide to Current Sensing (Rev. B) | 2022/4/12 | ||||
| 選擇指南 | Current Sense Amplifiers (Rev. E) | 2021/9/20 | ||||
| Application brief | Precision, Low-Side Current Measurement (Rev. B) | 2019/3/6 | ||||
| Application brief | Integrated-Resistor Current Sensors Simplify PCB Design | 2017/6/30 | ||||
| Application brief | Benefits of Intergated Low Inductive Shunt for PWM Applications | 2017/6/17 | ||||
| 技術文章 | How to get started with current sense amplifiers – part 3 | PDF | HTML | 2015/7/9 | |||
| 設計指南 | 30-A Range Bidirectional Current Shunt Monitor Design Guide | 2015/6/30 |
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
TIDA-00302 — 具瞬態穩定性的電流分流監控器參考設計
此高壓側電流分流監控器可用於測量電流通過电流感测電阻器時在电阻器上所形成的電壓。
此外，實作外部保護電路以提供突波和快速暫態保護，並針對 IEC61000-4-4 和 IEC61000-4-5 展示不同的抗擾度等級。
TIDA-00614 — 30-A 範圍雙向電流分流監控器參考設計
此經過驗證的設計能夠精確測量匯流排上 30A 範圍內的電流，匯流排共模電壓最高可達 36V，工作溫度範圍為 -40°C 至 +85°C。此設計在接地參考電壓下可測量 0A 至 30A 的電流，在 16V 參考電壓下可測量 -30A 至 0A 的電流。 此設計將兩個 INA250A2 裝置的輸出相加，產生一個接地參考輸出電壓。 INA250 是一款電壓輸出、電流檢測放大器系列，整合了一個內部分流電阻器，可實現高準確度電流測量。
TIDA-010011 — 用於保護繼電器處理器模組的高效電源供應架構參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |