INA281
- Wide common-mode voltage:
- Operational voltage: −4 V to +110 V
- Survival voltage: −20 V to +120 V
- Excellent CMRR:
- 120-dB DC CMRR
- 65-dB AC CMRR at 50 kHz
- Accuracy:
- Gain:
- Gain error: ±0.5% (maximum)
- Gain drift: ±20 ppm/°C (maximum)
- Offset:
- Offset voltage: ±55 µV (typical)
- Offset drift: ±0.1 µV/°C (typical)
- Gain:
- Available gains:
- INA281A1, INA281B1 : 20 V/V
- INA281A2, INA281B2 : 50 V/V
- INA281A3, INA281B3 : 100 V/V
- INA281A4, INA281B4 : 200 V/V
- INA281A5, INA281B5 : 500 V/V
- High bandwidth: 1.3 MHz
- Slew rate: 2.5V/µs
- Quiescent current: 1.5 mA
The INA281-Q1 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281-Q1 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).
The INA281-Q1 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281-Q1 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.
The INA281-Q1 is specified over an operating temperature range of −40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.
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 | INA281, –4-V to 110-V, 1.3-MHz Current-Sense Amplifier datasheet (Rev. A) | PDF | HTML | 2023/11/14 | ||
| 應用說明 | Using a PCB Copper Trace as a Current Sense Shunt Resistor (Rev. A) | PDF | HTML | 2026/4/27 | |||
| 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 | Current Sensing in Collaborative and Industrial Robotic Arms (Rev. B) | PDF | HTML | 2023/7/24 | |||
| Application brief | Current Sensing in an H-Bridge (Rev. D) | PDF | HTML | 2023/4/7 | |||
| Application brief | Current Sensing in Mobile Robots | PDF | HTML | 2022/11/29 | |||
| Application brief | High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. D) | PDF | HTML | 2022/8/15 | |||
| 證書 | INA281EVM EU Declaration of Conformity (DoC) | 2020/7/1 | ||||
| 技術文章 | How current sensors help monitor and protect the world’s wireless infrastructure | PDF | HTML | 2019/12/30 |
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)。
INA281EVM — INA281 -4-V 至 110-V、1.3-MHz 電流感測放大器評估模組
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。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 5 | Ultra Librarian |