INA138

現行

2.7 至 36V、800kHz 可變增益電流感測放大器

產品詳細資料

Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 1 Features Current Output Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 100 Bandwidth (kHz) 32 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.06 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 100 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 2.7 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 1 Features Current Output Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 100 Bandwidth (kHz) 32 Supply voltage (max) (V) 36 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.06 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 100 Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Complete Unipolar High-Side Current Measurement Circuit
  • Wide Supply and Common-Mode Range
  • INA138: 2.7 V to 36 V
  • INA168: 2.7 V to 60 V
  • Independent Supply and Input Common-Mode Voltages
  • Single Resistor Gain Set
  • Low Quiescent Current (25 µA Typical)
  • Wide Temperature Range: –40°C to +125°C
  • 5-Pin SOT-23 Package
  • Complete Unipolar High-Side Current Measurement Circuit
  • Wide Supply and Common-Mode Range
  • INA138: 2.7 V to 36 V
  • INA168: 2.7 V to 60 V
  • Independent Supply and Input Common-Mode Voltages
  • Single Resistor Gain Set
  • Low Quiescent Current (25 µA Typical)
  • Wide Temperature Range: –40°C to +125°C
  • 5-Pin SOT-23 Package

The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.

The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.

Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.

 

The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, which permits connecting the power supply to either side of the current measurement shunt with minimal error.

The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting.

Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.

 

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重要文件 類型 標題 格式選項 日期
* Data sheet INA1x8 High-Side Measurement Current Shunt Monitor datasheet (Rev. E) PDF | HTML 2017年 12月 20日
Circuit design High-voltage, high-side floating current sensing circuit using current output, c (Rev. A) PDF | HTML 2024年 9月 26日
Application note Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors (Rev. A) PDF | HTML 2022年 3月 21日
Application brief Extending Beyond the Max Common-Mode Range of Discrete Current-Sense Amplifiers (Rev. A) PDF | HTML 2022年 3月 10日
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 2022年 1月 25日
Technical article How to get started with current sense amplifiers – part 1 PDF | HTML 2015年 5月 19日
Analog Design Journal 4Q 2012 Issue Analog Applications Journal 2012年 9月 25日
Analog Design Journal Harnessing wasted energy in 4- to 20-mA current-loop systems 2012年 9月 25日
Analog Design Journal Q4 2008 Issue Analog Applications Journal 2008年 10月 22日
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design 2003年 2月 4日

設計與開發

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模擬型號

INA138 PSpice Model (Rev. A)

SBOM140A.ZIP (25 KB) - PSpice Model
模擬型號

INA138 TINA-TI Reference Design (Rev. A)

SBOC152A.TSC (45 KB) - TINA-TI Reference Design
模擬型號

INA138 TINA-TI Spice Model

SBFC024.TSM (3 KB) - TINA-TI Spice Model
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

CIRCUIT060032 — 使用電流輸出、電流感測放大器的高電壓、高壓側浮動電流感測電路

本手冊旨在示範為具有高共模電壓的系統設計準確電流感測解決方案的方法。此設計的主要特點是使用單向電路來監控 Vcm = 400V 的系統,方法是在供應匯流排 (VCM) 上跨接一個稽納二極體來浮動裝置供電。本手冊以 TIDA-00332 高電壓 12 V – 400 V DC 電流感測參考設計為基礎。
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。
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。
設計工具

SGLC001 Source Files for SBOA295

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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 (...)
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
參考設計

TIDA-00332 — 高電壓 12 V – 400 V DC 電流感測參考設計

This Verified Design shows a circuit to measure currents with a common mode of up to 400V using an INA138. This is achieved by creating a simple floating power supply and biasing the INA138 directly from the high voltage source. The 400V in this design is an example. With different components even (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-00799 — 具有低雜訊、低失真、DC 與 AC 輸入的四通道 12 位元 50 MSPS ADC 參考設計

此參考設計展示如何實作單端至差動輸入路徑,可針對 ADC3422 進行 AC 耦合或 DC 耦合。此外也說明如何設計高輸入阻抗、DC 耦合輸入路徑。此參考設計可用於低功率資料擷取、可攜式儀器及 IGBT 診斷等應用。
Design guide: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-23 (DBV) 5 Ultra Librarian

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