INA281

現行

-4-V 至 110-V、1.3-MHz、高精密電流感測放大器

產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 110 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 150, 200, 250, 300, 500 Input offset drift (±) (typ) (µV/°C) 0.07 Features High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 120 Bandwidth (kHz) 900, 1000, 1300 Supply voltage (max) (V) 20 Supply voltage (min) (V) 2.7 Iq (max) (mA) 2.25 Number of channels 1 Comparators (#) 0 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2.5 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 110 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 150, 200, 250, 300, 500 Input offset drift (±) (typ) (µV/°C) 0.07 Features High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 120 Bandwidth (kHz) 900, 1000, 1300 Supply voltage (max) (V) 20 Supply voltage (min) (V) 2.7 Iq (max) (mA) 2.25 Number of channels 1 Comparators (#) 0 Gain error (%) 0.5 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2.5 Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • 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)
  • 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
  • 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)
  • 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.

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.

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技術文件

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重要文件 類型 標題 格式選項 日期
* Data sheet INA281, –4-V to 110-V, 1.3-MHz Current-Sense Amplifier datasheet (Rev. A) PDF | HTML 2023年 11月 14日
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 2024年 11月 18日
Application brief Current Sensing in Collaborative and Industrial Robotic Arms (Rev. B) PDF | HTML 2023年 7月 24日
Application brief Current Sensing in an H-Bridge (Rev. D) PDF | HTML 2023年 4月 7日
Application brief Current Sensing in Mobile Robots PDF | HTML 2022年 11月 29日
Application brief High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. D) PDF | HTML 2022年 8月 15日
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 2022年 1月 25日
Certificate INA281EVM EU Declaration of Conformity (DoC) 2020年 7月 1日
Technical article How current sensors help monitor and protect the world’s wireless infrastructure PDF | HTML 2019年 12月 30日

設計與開發

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開發板

INA281EVM — INA281 -4-V 至 110-V、1.3-MHz 電流感測放大器評估模組

這是一個小型模組,具有 10 個完全獨立的電路板,可由使用者拆開。INA281 五種增益變體和兩種針腳配置變體的 10 個相同架構電路板,具有高達 110V 共模輸入與和 5A (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 | HTML
TI.com 無法提供
模擬型號

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計算工具

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計算工具

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This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
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設計工具

CIRCUIT060035 — 具有窗型比較器電路的雙向電流感測

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模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一,涵蓋我們的類比和電源產品組合,以及特定類比行為模型,且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前,建立完整的終端設備設計和解決方案原型,進而縮短上市時間並降低開發成本。 

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參考設計

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Design guide: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-23 (DBV) 5 Ultra Librarian

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  • 認證摘要
  • 進行中的可靠性監測
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