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類比電流感測放大器

INA290

現行

採用小型 (SC-70) 封裝的 2.7V 至 120V、1.1 MHz、超精密電流感測放大器

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INA290

現行
產品規格表 立即訂購

產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 120 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 12, 15, 20, 25 Input offset drift (±) (typ) (µV/°C) 0.2 Features Ultra precise Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 140 Bandwidth (kHz) 800, 850, 900, 1100 Iq (max) (mA) 0.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.1, 0.15 Gain error drift (±) (max) (ppm/°C) 5 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 120 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 12, 15, 20, 25 Input offset drift (±) (typ) (µV/°C) 0.2 Features Ultra precise Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 140 Bandwidth (kHz) 800, 850, 900, 1100 Iq (max) (mA) 0.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.1, 0.15 Gain error drift (±) (max) (ppm/°C) 5 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
SOT-SC70 (DCK) 5 4.2 mm² (2 mm × 2.1 mm)
  • Wide common-mode voltage:
    • Operational voltage: 2.7 V to 120 V
    • Survival voltage: −20 V to +122 V
  • Excellent CMRR:
    • 160-dB DC
    • 85-dB AC at 50 kHz
  • Accuracy
    • Gain:
      • Gain error: ±0.1% (maximum)
      • Gain drift: ±5 ppm/°C (maximum)
    • Offset:
      • Offset voltage: ±12 µV (maximum)
      • Offset drift: ±0.2 µV/°C (maximum)
  • Available gains:
    • A1 devices: 20 V/V
    • A2 devices: 50 V/V
    • A3 devices: 100 V/V
    • A4 devices: 200 V/V
    • A5 devices: 500 V/V
  • High bandwidth: 1.1 MHz
  • Slew rate: 2 V/µs
  • Quiescent current: 370 µA (per channel)
  • Wide common-mode voltage:
    • Operational voltage: 2.7 V to 120 V
    • Survival voltage: −20 V to +122 V
  • Excellent CMRR:
    • 160-dB DC
    • 85-dB AC at 50 kHz
  • Accuracy
    • Gain:
      • Gain error: ±0.1% (maximum)
      • Gain drift: ±5 ppm/°C (maximum)
    • Offset:
      • Offset voltage: ±12 µV (maximum)
      • Offset drift: ±0.2 µV/°C (maximum)
  • Available gains:
    • A1 devices: 20 V/V
    • A2 devices: 50 V/V
    • A3 devices: 100 V/V
    • A4 devices: 200 V/V
    • A5 devices: 500 V/V
  • High bandwidth: 1.1 MHz
  • Slew rate: 2 V/µs
  • Quiescent current: 370 µA (per channel)

The INAx290 is an ultra-precise, current-sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. The ultra-precise current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±12 µV (maximum), a small gain error of ±0.1% (maximum), and a high DC CMRR of 160 dB (typical). The INAx290 is not only designed for DC current measurement, but also for high-speed applications (such as fast overcurrent protection, for example) with a high bandwidth of 1.1 MHz (at gain of 20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INAx290 provides the capability to make ultra- precise current measurements by sensing the voltage drop across a shunt resistor over a wide common- mode range from 2.7 V to 120 V. The INAx290 devices come in highly space-efficient packages. The single-channel INA290 device is featured in the SC-70 package, the dual-channel INA2290 device is available in the MSOP-8 package, and the quad-channel INA4290 device is available in the 4 mm x 4 mm QFN package.

The INAx290 operates from a single 2.7-V to 20-V supply with the single channel device only drawing 370-µA supply current per channel (typical). The devices are available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset of the zero-drift architecture enables current sensing with low ohmic shunts as specified over the extended operating temperature range (−40°C to +125°C).

The INAx290 is an ultra-precise, current-sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. The ultra-precise current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±12 µV (maximum), a small gain error of ±0.1% (maximum), and a high DC CMRR of 160 dB (typical). The INAx290 is not only designed for DC current measurement, but also for high-speed applications (such as fast overcurrent protection, for example) with a high bandwidth of 1.1 MHz (at gain of 20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INAx290 provides the capability to make ultra- precise current measurements by sensing the voltage drop across a shunt resistor over a wide common- mode range from 2.7 V to 120 V. The INAx290 devices come in highly space-efficient packages. The single-channel INA290 device is featured in the SC-70 package, the dual-channel INA2290 device is available in the MSOP-8 package, and the quad-channel INA4290 device is available in the 4 mm x 4 mm QFN package.

The INAx290 operates from a single 2.7-V to 20-V supply with the single channel device only drawing 370-µA supply current per channel (typical). The devices are available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset of the zero-drift architecture enables current sensing with low ohmic shunts as specified over the extended operating temperature range (−40°C to +125°C).
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技術文件

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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 INAx290 2.7-V to 120-V, 1.1-MHz, Ultra-Precise Current Sense Amplifier datasheet (Rev. C) PDF | HTML 2021/6/29
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 Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML 2023/8/8
Application brief Improving Power Amplifier Efficiency With Current Monitors (Rev. B) PDF | HTML 2023/7/24
Application brief Current Sensing in an H-Bridge (Rev. D) PDF | HTML 2023/4/7
Application brief Safety and Protection for Discrete Digital Outputs in a PLC System Using Current (Rev. B) PDF | HTML 2022/3/10
Application brief Introduction to Current Sense Amplifiers PDF | HTML 2022/2/2
證書 INA290EVM EU Declaration of Conformity (DoC) (Rev. A) 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)。

開發板

INA290EVM — INA290 電流感測評估模組

這是一個小型模組，具有 5 個完全獨立的電路板，可由使用者拆開。INA290 五種增益變體中任一種的五個相同架構電路板，具有高達 110 V 共模輸入與 5 A（板載分流）輸入功能。各電路板都會提供 VS、GND、OUT，以及 VIN+ 和 VIN- 的端子區塊測試點。焊盤和插槽允許快速實作輸入和輸出濾波，以及板載 2512 尺寸的分流電阻器。
使用指南: PDF
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模擬型號

INA290A1 PSpice Model

SBOMC14.ZIP (15 KB) - PSpice 模型
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模擬型號

INA290A2 PSpice Model

SBOMC22.ZIP (14 KB) - PSpice 模型
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模擬型號

INA290A3 PSpice Model

SBOMC23.ZIP (14 KB) - PSpice 模型
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模擬型號

INA290A4 PSpice Model

SBOMC13.ZIP (15 KB) - PSpice 模型
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模擬型號

INA290A5 PSpice model

SBOMC12.ZIP (14 KB) - PSpice 模型
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模擬型號

TINA SPICE models for INA290 (Rev. A)

SBOMB26A.ZIP (50 KB) - TINA-TI Spice 模型
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模擬型號

TINA-TI REFERENCE DESIGN for INA290 (Rev. A)

SBOMB25A.ZIP (69 KB) - TINA-TI 參考設計
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計算工具

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。

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計算工具

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

此 Excel 計算機提供兩個與五個標準電流感測放大器的比較，並提供包含各裝置基本參數的圖表。此計算機也會採用使用者的系統條件輸入，例如共模電壓、供應電壓、分流電阻器值與公差，然後在可調整電流範圍中繪製錯誤曲線。此外，計算機會根據計算的全刻度輸入電壓除以最大量測電流，輸出最大分流值 (mΩ)。
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參考設計

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。

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-SC70 (DCK) 5 Ultra Librarian
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