INA191
- Low power:
- Supply voltage, V S: 1.7 V to 5.5 V
- Shutdown current: 100 nA (max INA191)
- Quiescent current: 43 µA at 25 °C (INA191)
- Low input bias currents: 100 pA (typical) (enables microamp current measurement)
- Bidirectional current measurement (INA2191)
- Accuracy:
- ±0.25% max gain error (A2 to A5 devices)
- 7-ppm/°C gain drift (maximum)
- ±12 µV (maximum) offset voltage
- 0.13-µV/°C offset drift (maximum)
- Wide common-mode voltage: –0.2 V to +40 V
- Gain options:
- INAx191A1: 25 V/V
- INAx191A2: 50 V/V
- INAx191A3: 100 V/V
- INAx191A4: 200 V/V
- INAx191A5: 500 V/V
- Packages:
- INA191: 0.895-mm 2 DSBGA
- INA2191: 1.79-mm 2 DSBGA
The INAx191 is a low-power, voltage-output, current-shunt monitor (also called a current-sense amplifier) that is commonly used for overcurrent protection, precision-current measurement for system optimization, or in closed-loop feedback circuits. This device can sense drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage. The low input bias current of the INAx191 permits the use of larger current-sense resistors, and thus provides accurate current measurements in the µA range. Five fixed gains are available: 25 V/V, 50 V/V, 100 V/V, 200 V/V, or 500 V/V. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement, and allows for smaller sense resistors with lower power loss while still providing accurate current measurements.
The INA191 operates from a single 1.7-V to 5.5-V power supply, drawing a maximum of 65 µA of supply current when enabled and only 100 nA when disabled. The device is specified over the operating temperature range of –40 °C to +125 °C, and offered in a DSBGA-6 (INA191) and DSBGA-12 (INA2191) packages.
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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 | INAx191 40-V, Bidirectional, Ultra-Precise Current Sense Amplifier With picoamp IB and ENABLE in WCSP Package datasheet (Rev. C) | PDF | HTML | 2021/8/2 | ||
| 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 | |||
| 技術文章 | Why current and magnetic sensing matters for wireless earbud design | PDF | HTML | 2019/11/11 | |||
| 技術文章 | The need for current sensing in optical modules for 100G and beyond | PDF | HTML | 2019/3/15 | |||
| Application brief | Precision, Low-Side Current Measurement (Rev. B) | 2019/3/6 | ||||
| Application brief | External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) | 2019/2/19 |
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)。
TINA-TI — 基於 SPICE 的類比模擬程式
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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 |
|---|---|---|
| DSBGA (YFD) | 6 | Ultra Librarian |