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類比電流感測放大器

INA225

現行

具四接腳可選增益設定的 36V 雙向電流感測放大器

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INA225

現行
產品規格表 立即訂購

產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Features Bidirectional, Low-side Capable, Programmable Gain Rating Catalog Voltage gain (V/V) 25, 50, 100, 200 CMRR (min) (dB) 95 Bandwidth (kHz) 200, 70, 125, 250 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.35 Number of channels 1 Comparators (#) 0 Gain error (%) 0.05, 0.1, 0.15 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 0.4 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 150 Input offset drift (±) (typ) (µV/°C) 0.1 Features Bidirectional, Low-side Capable, Programmable Gain Rating Catalog Voltage gain (V/V) 25, 50, 100, 200 CMRR (min) (dB) 95 Bandwidth (kHz) 200, 70, 125, 250 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.35 Number of channels 1 Comparators (#) 0 Gain error (%) 0.05, 0.1, 0.15 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 0.4 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Wide Common-Mode Range: 0 V to 36 V
  • Offset Voltage: ±150 µV (Max, All Gains)
  • Offset Voltage Drift: 0.5 µV/°C (Max)
  • Gain Accuracy, Over Temperature (Max):
    • 25 V/V, 50 V/V: ±0.15%
    • 100 V/V: ±0.2%
    • 200 V/V: ±0.3%
    • 10-ppm/°C Gain Drift
  • 250-kHz Bandwidth (Gain = 25 V/V)
  • Programmable Gains:
    • G1 = 25 V/V
    • G2 = 50 V/V
    • G3 = 100 V/V
    • G4 = 200 V/V
  • Quiescent Current: 350 µA (Max)
  • Package: MSOP-8
  • Wide Common-Mode Range: 0 V to 36 V
  • Offset Voltage: ±150 µV (Max, All Gains)
  • Offset Voltage Drift: 0.5 µV/°C (Max)
  • Gain Accuracy, Over Temperature (Max):
    • 25 V/V, 50 V/V: ±0.15%
    • 100 V/V: ±0.2%
    • 200 V/V: ±0.3%
    • 10-ppm/°C Gain Drift
  • 250-kHz Bandwidth (Gain = 25 V/V)
  • Programmable Gains:
    • G1 = 25 V/V
    • G2 = 50 V/V
    • G3 = 100 V/V
    • G4 = 200 V/V
  • Quiescent Current: 350 µA (Max)
  • Package: MSOP-8

The INA225 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 µA of supply current. The device is specified over the extended operating temperature range (–40°C to +125°C), and is offered in an MSOP-8 package.

The INA225 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 µA of supply current. The device is specified over the extended operating temperature range (–40°C to +125°C), and is offered in an MSOP-8 package.
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重要文件 類型 標題 格式選項 日期
* Data sheet INA225 36-V, Programmable-Gain, Voltage-Output, Bidirectional, Zero-Drift Series, Current-Shunt Monitor datasheet (Rev. A) PDF | HTML 2014年 3月 11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 Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML 2023年 8月 8日
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 2022年 10月 17日
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 2022年 1月 25日
Selection guide Current Sense Amplifiers (Rev. E) 2021年 9月 20日
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 2021年 2月 23日
Application brief Precision, Low-Side Current Measurement (Rev. B) 2019年 3月 6日
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 2019年 2月 19日
Technical article How to detect insulation failures in electrical equipment – part 2 PDF | HTML 2016年 5月 2日
Technical article How to get started with current sense amplifiers – part 1 PDF | HTML 2015年 5月 19日

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開發板

INA225EVM — 適用於 36-V 可編程增益、電流分流監控器的 INA225 評估模組

The INA225 is a voltage output current-shunt monitor that senses drops across shunts at common-mode voltages from 0V to 36V, independent of the supply voltage. The four gain versions are selectable using the 2 external gain select pins, GS0 and GS1. These pins allow a gain of 25, 50, 100, and 200 (...)

使用指南: PDF
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模擬型號

INA225 PSpice Model (Rev. A)

SBOM933A.ZIP (508 KB) - PSpice Model
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模擬型號

INA225 TINA-TI Reference Design (Rev. A)

SBOM881A.TSC (4254 KB) - TINA-TI Reference Design
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模擬型號

INA225 TINA-TI Spice Model (Rev. A)

SBOM882A.ZIP (10 KB) - TINA-TI Spice Model
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模擬型號

REF6045 TINA-TI Reference Design (Rev. A)

SBOM993A.ZIP (22 KB) - TINA-TI Reference Design
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計算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

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

此雙向電流感測解決方案採用電流感測放大器與高速雙比較器，並具備軌對軌輸入共模範圍，可在比較器輸出 (OUTA 和 OUTB) 處建立過電流 (OC) 警示訊號，如果輸入電流 (IG1) 高於 100 A 或降至 -35 A 以下。在此實作中，兩個過電流警示訊號都是高電位作動，因此當超過 100 A 或 -35 A 閾值時，比較器輸出將會變高。在兩個比較器上實作外部磁滯，因此當電流降低 10% (90 A 和 -31 A) 時，比較器輸出將回到邏輯低狀態。雖然下方電路將分流電阻器 R8 連接至接地，但相同的電路仍適用於高壓側電流感測，最高可達 INA 的共模電壓範圍。
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設計工具

CIRCUIT060037 — 精密過電流閂鎖電路

這個高壓側電流感測解決方案採用電流感測放大器、含整合式參考的比較器以及 P 通道 MOSFET，以建立過電流閂鎖電路。當偵測到負載電流大於 200 mA 時，電路會中斷系統與電源的連接。比較器輸出將閂鎖 (將 P 通道 MOSFET 的閘極電壓保持在 0 V)，直到電路的電源開始循環，因為比較器會驅動 P 通道 MOSFET 的閘極，並將訊號傳送回電流感測放大器的參考針腳。
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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。 

在 PSpice for TI 設計與模擬工具中，您可以搜尋 TI (...)
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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 (...)
使用指南: PDF
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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

This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

Design guide: PDF
電路圖: PDF
參考設計

TIDA-00440 — 用於判斷絕緣電阻的漏電流量測參考設計

This reference design measures insulation resistance up to 100 MΩ. It has an on-board isolated 500-Vdc power supply and an isolated signal conditioning circuit to measure the leakage current. This design is useful to find leakage due to insulation breakdown in transformer and motor windings.
Design guide: PDF
電路圖: PDF
參考設計

PMP40182 — 雙向電池初始化系統電源板參考設計

本參考設計是適用於汽車與電池應用的電池初始化解決方案。此模組可實現電池充放電的高效率單級轉換。本設計採用高性能 INA225 電流感測放大器，具備 0.1% 準確度的電流控制迴路。此設計以精巧外型尺寸 (40mm x 143mm x 20mm) 實現完整功能。 
Test report: PDF
電路圖: PDF
參考設計

TIDA-00328 — 50 mA-20 A、單電源、低壓側或高壓側電流感測解決方案

This TI Reference Design implements a low-side or high-side wide dynamic range current sensing solution.  Wide dynamic range is achieved by a unique gain switching method.  Switching gain in hardware allows a faster response time than what can typically be achieved with other (...)
Design guide: PDF
電路圖: PDF
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