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類比電流感測放大器

INA381

現行

具有整合式過電流比較器的 26-V、350-kHz 電流感測放大器

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產品規格表

INA381

現行
產品規格表 立即訂購

產品詳細資料

Product type Analog output with integrated comparator Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.45 Number of channels 1 Comparators (#) 1 Gain error (%) 1 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output with integrated comparator Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 84 Bandwidth (kHz) 105, 150, 210, 350 Iq (max) (mA) 0.45 Number of channels 1 Comparators (#) 1 Gain error (%) 1 Gain error drift (±) (max) (ppm/°C) 20 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² (3 mm × 4.9 mm) WSON (DSG) 8 4 mm² (2 mm × 2 mm)
  • Common-mode input range: –0.2 V to +26 V
  • High accuracy amplifier:
    • Offset voltage at TA = 25°C
      • 500 µV (maximum) at VCM = 12 V
      • 150 µV (maximum) at VCM = 0 V
    • Offset voltage drift: 1 µV/°C (maximum)
    • Gain error: 1% (maximum) at 25°C
    • Gain error drift: 20 ppm/°C (maximum)
  • Available amplifier gains:
    • INA381A1: 20 V/V
    • INA381A2: 50 V/V
    • INA381A3: 100 V/V
    • INA381A4: 200 V/V
  • Open-drain comparator:
    • Hysteresis: 50 mV
    • Propagation delay: 400 ns (typ)
    • Alert threshold set through external reference voltage
    • Supports transparent and latching modes
  • Packages: VSSOP-10 and WSON-8
  • Common-mode input range: –0.2 V to +26 V
  • High accuracy amplifier:
    • Offset voltage at TA = 25°C
      • 500 µV (maximum) at VCM = 12 V
      • 150 µV (maximum) at VCM = 0 V
    • Offset voltage drift: 1 µV/°C (maximum)
    • Gain error: 1% (maximum) at 25°C
    • Gain error drift: 20 ppm/°C (maximum)
  • Available amplifier gains:
    • INA381A1: 20 V/V
    • INA381A2: 50 V/V
    • INA381A3: 100 V/V
    • INA381A4: 200 V/V
  • Open-drain comparator:
    • Hysteresis: 50 mV
    • Propagation delay: 400 ns (typ)
    • Alert threshold set through external reference voltage
    • Supports transparent and latching modes
  • Packages: VSSOP-10 and WSON-8

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in two modes: transparent or latched. In transparent mode, the output status follows the input state. In latched mode, the alert output is cleared only when the latch is reset. The standalone comparator large-signal alert response time is less than 2 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection response time provided by the INA381 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C, and is available in 8-pin WSON and 10-pin VSSOP packages.

 

 

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in two modes: transparent or latched. In transparent mode, the output status follows the input state. In latched mode, the alert output is cleared only when the latch is reset. The standalone comparator large-signal alert response time is less than 2 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection response time provided by the INA381 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C, and is available in 8-pin WSON and 10-pin VSSOP packages.

 

 
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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 INA381 26-V, High-Speed, Current Sense Amplifier With Integrated Comparator datasheet (Rev. B) PDF | HTML 2019/10/10
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 Improving Power Amplifier Efficiency With Current Monitors (Rev. B) PDF | HTML 2023/7/24
Application brief Current Sensing in Mobile Robots PDF | HTML 2022/11/29
電子書 An Engineer's Guide to Current Sensing (Rev. B) 2022/4/12
Application brief Measuring Current To Detect Out-of-Range Conditions (Rev. D) PDF | HTML 2022/3/10
Application brief Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) PDF | HTML 2021/10/4
選擇指南 Current Sense Amplifiers (Rev. E) 2021/9/20
類比設計期刊 Current sensing in high‐power USB Type‐C applications 2020/12/21
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 2019/3/6
技術文章 A key to accurate system thermal management: monitoring both current flow and temp PDF | HTML 2018/10/4
Circuit design Overcurrent event detection circuit 2018/7/31
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 2017/9/5

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

INA381EVM — 含整合式過電流比較器的 INA381 電流感測放大器評估模組

INA381 是一款電流感測監視器解決方案，內建比較器用於偵測過電流狀況，為成本敏感型應用提供易用性及高性能。  INA381EVM 旨在提供對裝置系列的基本功能評估。此固定裝置配置不作為目標電路模型使用，也非為電磁 (EMI) 測試進行布局。INA381EVM 包含單一 PCB，可分為 4 個獨立部分以評估不同的裝置變體。
使用指南: PDF
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模擬型號

INA381 TINA-TI Reference Design

SBOMAL8.TSC (5235 KB) - TINA-TI 參考設計
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模擬型號

INA381 TINA-TI Spice Model

SBOMAL9.ZIP (40 KB) - TINA-TI Spice 模型
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模擬型號

INA381A1 PSpice Model

SBOMBD6.ZIP (29 KB) - TISpice 模型
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模擬型號

INA381A2 PSpice Model

SBOMBC0.ZIP (29 KB) - PSpice 模型
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模擬型號

INA381A3 PSpice Model

SBOMBF6.ZIP (28 KB) - PSpice 模型
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模擬型號

INA381A4 PSpice Model

SBOMBF3.ZIP (28 KB) - PSpice 模型
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模擬工具

SBOC519 — Low-Side OCP Source Files for SBOA297

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模擬工具

SBOC520 — High-Side OCP Source Files for SBOA297

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模擬工具

TINA-TI — 基於 SPICE 的類比模擬程式

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

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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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設計工具

CIRCUIT060034 — 過電流事件偵測電路

這是一款單向電流感測解決方案，通常稱為過電流保護 (OCP)，可提供過電流警示訊號以關閉系統臨界電流，並在輸出降至低於過電流輸出臨界電壓 (Vout_OC) 所需電壓 (Vout_release) 時重新啟用系統。在此特定設定中，感測範圍為 1.5 A 至 40 A，過電流閾值定義為 35 A (IOC_TH)。當電流降至低於 32 A (IRelease_TH) 時，系統會重新宣告警示為高。電流分流監控器由 3.3-V 電源軌供電。OCP 可套用至高壓側與低壓側拓撲。本文介紹的解決方案為高壓側實作。
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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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參考設計

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

此參考設計展示各種電源架構，可為需要 >1A 負載電流和高效率的應用處理器模組產生多重電壓軌。所需的電源是使用來自背板的 5、12 或 24-V DC 輸入所產生。電源供應器是使用配備整合式 FET 的 DC-DC 轉換器，以及具尺寸整合式電感器的電源模組所產生。此設計採用 HotRod™ 封裝類型，適合需要低 EMI 的應用。此外也最適合設計時間有限的應用。其他功能包括 DDR 終端穩壓器、輸入電源 OR-ing、電壓序列、用於過載保護的 eFuse，以及電壓和負載電流監控。此設計可搭配處理器、數位訊號處理器以及現場可編程邏輯閘陣列使用。已通過輻射發射測試，符合 A 類和 B 要求的 (...)
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VSSOP (DGS) 10 Ultra Librarian
WSON (DSG) 8 Ultra Librarian
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