INA240-Q1

現行

具有強化型 pwm 抑制功能的 AEC-Q100、-4 至 80V、雙向、超精密電流感測放大器

產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 25 Input offset drift (±) (typ) (µV/°C) 0.05 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Automotive Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 120 Bandwidth (kHz) 400 Iq (max) (mA) 2.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.2 Gain error drift (±) (max) (ppm/°C) 2.5 Slew rate (V/µs) 2 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -4 Input offset (±) (max) (µV) 25 Input offset drift (±) (typ) (µV/°C) 0.05 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Automotive Voltage gain (V/V) 20, 50, 100, 200 CMRR (min) (dB) 120 Bandwidth (kHz) 400 Iq (max) (mA) 2.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.2 Gain error drift (±) (max) (ppm/°C) 2.5 Slew rate (V/µs) 2 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
TSSOP (PW) 8 19.2 mm² (3 mm × 6.4 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • AEC-Q100 Qualified for Automotive Applications
    • Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Temperature Grade 0: –40°C to +150°C Ambient Operating Temperature Range
    • HBM ESD Classification Level H2
    • CDM ESD Classification Level C5
  • Functional Safety-Capable
  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain Error: 0.20% (Maximum) With 2.5 ppm/°C (Maximum Drift)
    • Offset Voltage: ±25 µV (Maximum) With 250 nV/°C (Maximum Drift)
  • Available Gains:
    • INA240A1-Q1: 20 V/V
    • INA240A2-Q1: 50 V/V
    • INA240A3-Q1: 100 V/V
    • INA240A4-Q1: 200 V/V
  • AEC-Q100 Qualified for Automotive Applications
    • Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Temperature Grade 0: –40°C to +150°C Ambient Operating Temperature Range
    • HBM ESD Classification Level H2
    • CDM ESD Classification Level C5
  • Functional Safety-Capable
  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain Error: 0.20% (Maximum) With 2.5 ppm/°C (Maximum Drift)
    • Offset Voltage: ±25 µV (Maximum) With 250 nV/°C (Maximum Drift)
  • Available Gains:
    • INA240A1-Q1: 20 V/V
    • INA240A2-Q1: 50 V/V
    • INA240A3-Q1: 100 V/V
    • INA240A4-Q1: 200 V/V

The INA240 -Q1 device is an automotive-qualified, voltage-output, current-sense amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative common-mode voltage allows the device to operate below ground, accommodating the flyback period of typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as motor drives and solenoid control systems). This feature allows for accurate current measurements without large transients and associated recovery ripple on the output voltage.

This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale. Grade 1 versions are specified over the extended operating temperature range (–40°C to +125°C) and are offered in an 8-pin TSSOP and 8-pin SOIC packages. Grade 0 versions are specified over the extended operating temperature range (–40°C to +150°C) and are offered in an 8-pin SOIC package.

The INA240 -Q1 device is an automotive-qualified, voltage-output, current-sense amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative common-mode voltage allows the device to operate below ground, accommodating the flyback period of typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as motor drives and solenoid control systems). This feature allows for accurate current measurements without large transients and associated recovery ripple on the output voltage.

This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale. Grade 1 versions are specified over the extended operating temperature range (–40°C to +125°C) and are offered in an 8-pin TSSOP and 8-pin SOIC packages. Grade 0 versions are specified over the extended operating temperature range (–40°C to +150°C) and are offered in an 8-pin SOIC package.

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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 INA240-Q1 AEC-Q100, –4-V to 80-V, Bidirectional, Ultra-Precise Current Sense Amplifier With Enhanced PWM Rejection datasheet (Rev. E) PDF | HTML 2021/12/14
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 Mode Control in Switching Power Supplies (Rev. E) PDF | HTML 2023/4/12
Application brief Low-Drift, Precision, In-Line Motor Current Measurements With PWM Rejection (Rev. D) PDF | HTML 2023/4/7
Application brief Current Sensing in an H-Bridge (Rev. D) PDF | HTML 2023/4/7
Application brief Switching Power Supply Current Measurements (Rev. E) PDF | HTML 2023/4/7
Application brief Integrating the Current Sensing Resistor (Rev. D) PDF | HTML 2023/4/7
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 2022/10/17
Application brief High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. D) PDF | HTML 2022/8/15
電子書 An Engineer's Guide to Current Sensing (Rev. B) 2022/4/12
Application brief 12-V Battery Monitoring in an Automotive Module (Rev. A) PDF | HTML 2022/3/10
選擇指南 Current Sense Amplifiers (Rev. E) 2021/9/20
技術文章 Solving the multidecade current-measurement challenge in your 48-V BMS application PDF | HTML 2021/6/14
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 2021/2/23
Application brief Shunt-Based Current-Sensing Solutions for BMS Applications in HEVs and EVs (Rev. B) PDF | HTML 2021/2/2
功能安全資訊 INA240-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMEA (Rev. A) 2020/3/23
應用說明 Evaluating Current Sensing Amplifiers in Body Control Modules Using Simulation 2019/12/16
技術文章 Current-sensing dynamics in automotive solenoids PDF | HTML 2019/11/1
Circuit design High-Side, Bidirectional Current-Sensing Circuit with Transient Protection (Rev. A) PDF | HTML 2019/2/1
類比設計期刊 Second-sourcing options for small-package amplifiers 2018/3/26
應用說明 Dual Motor Ctl Using FCL and Perf Analysis Using SFRA on TMS320F28379D LaunchPad (Rev. A) 2018/3/20
應用說明 Performance Analysis of Fast Current Loop (FCL) in Servo 2018/3/6
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 2017/9/5
技術文章 Understanding current sensing in HEV/EV batteries PDF | HTML 2017/8/2
Application brief Benefits of Intergated Low Inductive Shunt for PWM Applications 2017/6/17
Application brief Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers 2017/2/28
技術文章 Gallium nitride transistors open up new frontiers in high-speed motor drives PDF | HTML 2016/12/12
技術文章 Five benefits of enhanced PWM rejection for in-line motor control PDF | HTML 2016/11/8
應用說明 Current Sensing for Inline Motor-Control Applications 2016/10/20
技術文章 Precision current measurement enhances electronic power-steering systems PDF | HTML 2016/9/19

設計與開發

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開發板

INA240EVM — 適用於 PWM 應用的高壓側或低壓側電流感測放大器評估模組

使用 INA240 評估模組評估 INA240 電流感測放大器的性能。INA240EVM 封裝包含一塊大型 PCB,可分割成四塊獨立電路板,分別對應四種增益版本 (INA240A1/A2/A3/A4)。

該 EVM 包含用於外部硬體連接的測試點、可加裝濾波元件的預留焊墊,以及便於設定參考電壓的表面黏著電阻。

使用指南: PDF
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模擬型號

INA240 PSpice Model

SBOMB42.ZIP (48 KB) - PSpice 模型
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模擬型號

INA240 TINA-TI Reference Design (Rev. A)

SBOMAC8A.TSC (440 KB) - TINA-TI 參考設計
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模擬型號

INA240 TINA-TI Spice Model (Rev. A)

SBOMAC7A.ZIP (28 KB) - TINA-TI Spice 模型
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模擬型號

INA240A1 PSpice Model

SBOMBE4.ZIP (23 KB) - PSpice 模型
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INA240A2 PSpice Model

SBOMBG4.ZIP (23 KB) - PSpice 模型
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模擬型號

INA240A3 PSpice Model

SBOMBC6.ZIP (23 KB) - PSpice 模型
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模擬型號

INA240A4 PSpice Model

SBOMBG5.ZIP (25 KB) - PSpice 模型
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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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參考設計

TIDA-01421 — 用於無感測器位置量測的車用有刷馬達波紋電流計數器參考設計

隨著現代汽車中的小型馬達持續演進,對保留座椅、車窗、滑動車門、後視鏡、升降門與其他由馬達驅動之位置記憶的需求也隨之增加。現有解決方案利用連接至馬達本體的多個磁性感測器,為馬達控制模組提供回饋迴路。無感測器方法可為現有解決方案提供備援,在某些情況下,可省去對附有感測器馬達的需求。透過導入直列式電流感測訊號調整電路,無感測器方法變得越來越受歡迎。此參考設計提供的解決方案可輕鬆修改,以適用於許多控制位置量測的汽車馬達系統。
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參考設計

TIDA-01506 — 車用比例式電磁閥電流感測器的參考設計

若要在自動變速箱、電子噴油器和多個汽車致動器應用中進行精確控制,請務必精準控制汽車比例電磁閥。在比例電磁閥中,流過線圈的電流會與產生的磁場成正比。設計人員可以透過了解流過電磁閥的電流來估計電樞位置。透過使用高精度電流感測器形成閉環螺線管控制,設計人員能夠以精確的方式控制比例電磁閥。此控制順序意味著高準確度電流感測器是實現電磁閥精確控制的關鍵。選擇電流感測器時,需考慮的一些主要層面包括較小的偏移、較小的漂移及較高的脈衝寬度調變 (PWM) 拒斥比。透過結合以上三項特性,此參考設計展示了一種使用 TI 的電流分流監控產品組合精確測量流過電磁閥電流的方法。
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參考設計

TIDA-03050 — 車用 mA 至 kA 級電流分流感測器參考設計

此參考設計展示如何使用匯流排式分流電阻器,偵測來自 mA 至 kA 範圍的電流。電動車 (EV) 與混合動力電動車 (HEV) 對高容量電池的需求與日俱增,推動了對更大電流跨度與高準確度電流感測器的需求。由於系統中有大量雜訊,因此在三個數量級(mA 至 A、1A 至 100A 和 100A 至 1000A)內要獲得良好準確度相當具挑戰性。此設計使用 TI 的高解析度類比轉數位轉換器 (ADC) 和高準確度電流分流監控器,可解決此問題。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
TSSOP (PW) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian

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