Bumalik sa Texas Instruments

Texas Instruments INA280/INA280-Q1 Current Sense Amplifier

Texas Instruments INA280/INA280-Q1 High-Precision Current Sense Amplifier is a current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7V to 120V. It is in a highly space-efficient SC-70 package with a PCB footprint of only 2.0mm × 2.1mm. The current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±150µV (maximum), a small gain error of ±0.5% (maximum), and a high DC CMRR of 140 dB (typical). The INA280/INA280-Q1 is not only designed for DC current measurement but also high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.1MHz (at a gain of 20V/V) and an 85dB AC CMRR (at 50kHz).

The Texas Instruments INA280/INA280-Q1 operates from a single 2.7V to 20V supply and draws a 370µA supply current (typical). The INA280 has five gain options: 20V/V, 50V/V, 100V/V, 200V/V, and 500V/V. The low offset and drift of the INA280/INA280-Q1 enables accurate current sensing over the extended operating temperature range of -40°C to +125°C. The INA280-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Wide common-mode voltage
    • 2.7V to 120V operational voltage
    • −20V to +122V survival voltage
  • Excellent CMRR
    • 120dB DC (minimum)
    • 85dB AC at 50kHz
  • Accuracy
    • Gain
      • ±0.5% (maximum) gain error
      • ±20ppm/°C (maximum) gain drift
    • Offset
      • ±150µV (maximum) offset voltage
      • ±1µV/°C (maximum) offset drift
  • Available gains
    • INA280A1 - 20V/V
    • INA280A2 - 50V/V
    • INA280A3 - 100V/V
    • INA280A4 - 200V/V
    • INA280A5 - 500V/V
  • 1.1MHz high bandwidth
  • 2V/µs slew rate
  • 370µA quiescent current

Applications

  • Active antenna system mMIMO (AAS)
  • Macro remote radio unit (RRU)
  • 48V rack server
  • 48V merchant network and server power supply
  • Test and measurement

Datasheets

Simplified Schematic

Block Diagram - Texas Instruments INA280/INA280-Q1 Current Sense Amplifier

Related Development Tool

Texas Instruments INA280EVM Current Sensing Evaluation Module

Five schematically identical boards for each of the five gain variations of the INA280.

Learn Moretungkol sa Texas Instruments INA280EVM Current Sensing Evaluation Module View Productskaugnay ng Texas Instruments INA280EVM Current Sensing Evaluation Module
Inilathala: 2020-12-01 | Na-update: 2024-10-02