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類比電流感測放大器

INA301

現行

具比較器的 36V、550kHz、4V/µs、高精度電流感測放大器

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INA301

現行
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產品詳細資料

Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm)
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.
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INA300 現行 36V 電流感測比較器 The INA300 offers only an ALERT signal
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INA303 現行 具有窗型比較器的 36V、雙向、550kHz、4V/µs、高精密度電流感測放大器 The INA303 has window comparotor functionality

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 INA301 36-V, High-Speed, Zero-Drift, Voltage-Output, Current-Shunt Monitor with High-Speed, Overcurrent Comparator datasheet (Rev. A) PDF | HTML 2016/2/11
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 Integrating the Current Sensing Resistor (Rev. D) PDF | HTML 2023/4/7
技術文章 4 key current-sensing design trends that are powering electrification PDF | HTML 2023/2/21
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 2022/10/17
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
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 2021/9/29
選擇指南 Current Sense Amplifiers (Rev. E) 2021/9/20
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 2021/2/23
技術文章 Use fast, precise overcurrent detection to enable diagnostics in automotive safety PDF | HTML 2019/6/24
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 2019/3/6
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 2019/2/19
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
應用說明 Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout 2017/10/27
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 2017/9/5
白皮書 Overcurrent protection enables more efficient and reliable systems 2016/5/16

設計與開發

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開發板

INA301EVM — INA301 評估模組

同一個 EVM 封裝中提供三種不同的增益裝置，讓客戶能視需求快速設定並評估任何或所有裝置。

使用指南: PDF
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模擬型號

INA301 PSpice Model

SBOMA60.ZIP (71 KB) - PSpice 模型
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模擬型號

INA301 TINA-TI Reference Design (Rev. A)

SBOM959A.TSC (468 KB) - TINA-TI 參考設計
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模擬型號

INA301 TINA-TI Spice Model (Rev. A)

SBOM960A.ZIP (22 KB) - TINA-TI Spice 模型
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模擬型號

INA301A1 PSpice Model

SBOMBH1.ZIP (28 KB) - PSpice 模型
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模擬型號

INA301A2 PSpice Model

SBOMBF4.ZIP (27 KB) - PSpice 模型
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模擬型號

INA301A3 PSpice Model

SBOMBH2.ZIP (28 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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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

PMP22125 — 電池備援開關、充電器和監測器參考設計

此參考設計已實現完整的電池備援、充電器和監控。  包括在 12/24-Vdc 電源和 12/24-V 鉛酸電池之間切換、一般為 1 A 的定電流電池充電、電池維持浮動充電、以及電池和輸入電源的電路監控。
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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-010065 — 基於高效、低排放、隔離式 DC/DC 轉換器的類比輸入模組參考設計

此參考設計為一簡化架構，可產生隔離式電源供應，適用於測量隔離電壓與電流的隔離式放大器。具 5-V 輸入之強化隔離操作的完全整合式 DC/DC 轉換器，並具備可設定 5-V 或 5.4-V 輸出 (適用於低壓降穩壓器 (LDO) 的空餘空間) 可產生隔離電源。介接至 ±50-mV 輸入範圍隔離放大器，且配置爲通道隔離輸入的分流，可測量電流。連接至 ±250-mV 或 ±12-V 輸入範圍隔離放大器，且配置爲群組隔離輸入的潛在分頻器，可測量電壓。隔離放大器介面直接輸出至 24 位元 ΔΣ 類比轉數位轉換器 (ADC)，或使用增益放大器擴展至 ±10 V，並連接至 16 位元 SAR ADC (...)
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VSSOP (DGK) 8 Ultra Librarian
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