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類比電流感測放大器

INA302

現行

具雙比較器的 36V、雙向、550kHz、4V/µ s、高精度電流感測放大器

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INA302

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) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 30, 50, 80 Input offset drift (±) (typ) (µV/°C) 0.02 Features Alert Function, Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 400, 440, 550 Iq (max) (mA) 1.15 Number of channels 1 Comparators (#) 2 Gain error (%) 0.075, 0.1, 0.15 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) 30, 50, 80 Input offset drift (±) (typ) (µV/°C) 0.02 Features Alert Function, Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 400, 440, 550 Iq (max) (mA) 1.15 Number of channels 1 Comparators (#) 2 Gain error (%) 0.075, 0.1, 0.15 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
TSSOP (PW) 14 32 mm² (5 mm × 6.4 mm)
  • Wide common-mode input range: –0.1 V to +36 V
  • Dual comparator outputs:
    • INA302: Two independent overlimit alerts
    • INA303: Window comparator
    • Threshold levels set individually
    • Comparator 1 alert response: 1 µs
    • Comparator 2 adjustable delay: 2 µs to 10 s
    • Open-drain outputs with independent latch control modes
  • High accuracy amplifier:
    • Offset voltage: 30 µV (max, A3 version)
    • Offset voltage drift: 0.5 µV/°C (max)
    • Gain error: 0.15% (max, A3 version)
    • Gain error drift: 10 ppm/°C
  • Available amplifier gains:
    • INA302A1, INA303A1: 20 V/V
    • INA302A2, INA303A2: 50 V/V
    • INA302A3, INA303A3: 100 V/V
  • Wide common-mode input range: –0.1 V to +36 V
  • Dual comparator outputs:
    • INA302: Two independent overlimit alerts
    • INA303: Window comparator
    • Threshold levels set individually
    • Comparator 1 alert response: 1 µs
    • Comparator 2 adjustable delay: 2 µs to 10 s
    • Open-drain outputs with independent latch control modes
  • High accuracy amplifier:
    • Offset voltage: 30 µV (max, A3 version)
    • Offset voltage drift: 0.5 µV/°C (max)
    • Gain error: 0.15% (max, A3 version)
    • Gain error drift: 10 ppm/°C
  • Available amplifier gains:
    • INA302A1, INA303A1: 20 V/V
    • INA302A2, INA303A2: 50 V/V
    • INA302A3, INA303A3: 100 V/V

The INA302 and INA303 (INA30x) devices feature a high common-mode, bidirectional, current-sensing amplifier and two high-speed comparators to detect out-of-range current conditions. The INA302 comparators are configured to detect and respond to overcurrent conditions. The INA303 comparators are configured to respond to both overcurrent and undercurrent conditions in a windowed configuration. These devices feature an adjustable limit threshold range for each comparator set using an external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from –0.1 V up to +36 V, independent of the supply.

The open-drain alert outputs can be configured to operate in either a transparent mode (output status follows the input state), or in a latched mode (alert output is cleared when the latch is reset). The alert response time for comparator 1 is under 1 µs, and the alert response for comparator 2 is set through an external capacitor ranging from 2 µs to 10 s.

These devices operate from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 950 µA. The devices are specified over the extended operating temperature range of –40°C to +125°C, and are available in a 14-pin TSSOP package.

The INA302 and INA303 (INA30x) devices feature a high common-mode, bidirectional, current-sensing amplifier and two high-speed comparators to detect out-of-range current conditions. The INA302 comparators are configured to detect and respond to overcurrent conditions. The INA303 comparators are configured to respond to both overcurrent and undercurrent conditions in a windowed configuration. These devices feature an adjustable limit threshold range for each comparator set using an external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from –0.1 V up to +36 V, independent of the supply.

The open-drain alert outputs can be configured to operate in either a transparent mode (output status follows the input state), or in a latched mode (alert output is cleared when the latch is reset). The alert response time for comparator 1 is under 1 µs, and the alert response for comparator 2 is set through an external capacitor ranging from 2 µs to 10 s.

These devices operate from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 950 µA. The devices are specified over the extended operating temperature range of –40°C to +125°C, and are available in a 14-pin TSSOP package.
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INA301 現行 具比較器的 36V、550kHz、4V/µs、高精度電流感測放大器 The INA301 has a single ALERT with similar performance
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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 INA30x 36-V, Overcurrent Protection, Precision, Current-Sense Amplifiers With Dual Integrated Comparators datasheet (Rev. C) PDF | HTML 2019/3/26
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 Integrating the Current Sensing Resistor (Rev. D) PDF | HTML 2023/4/7
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
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
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

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

INA302EVM — INA302 高速精密電流感測放大器評估模組

INA302EVM 評估模組 (EVM) 是一款精巧、易於使用的平台，在指定輸入電壓、共模電壓與溫度範圍下運用雙整合式比較器，評估 INA302 高速精密電流感測放大器的主要功能與性能。EVM 配備所有可獨立評估的 3 個增益變體，並提供測試點以輕鬆探查所有關鍵訊號。該 EVM 也包含 LED 指示燈，可方便監控比較器輸出訊號。
使用指南: PDF
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模擬型號

INA302 PSpice Model

SBOMB41.ZIP (64 KB) - PSpice 模型
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模擬型號

INA302 TINA-TI Reference Design

SBOMAC2.TSC (324 KB) - TINA-TI 參考設計
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模擬型號

INA302 TINA-TI Spice Model

SBOMAC1.ZIP (30 KB) - TINA-TI Spice 模型
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模擬型號

INA302A1 PSpice Model

SBOMBH3.ZIP (35 KB) - PSpice 模型
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模擬型號

INA302A2 PSpice Model

SBOMBH4.ZIP (35 KB) - PSpice 模型
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模擬型號

INA302A3 PSpice Model

SBOMBH5.ZIP (35 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

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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TSSOP (PW) 14 Ultra Librarian
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