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INA381 - Current Sense Amplifier

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General Description

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator.

This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin.

The current-shunt monitor can measure differential voltage signals on commonmode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

Overview

Product Folder Order Now Technical Documents Tools & Software Support & Community INA381 SBOS848B – DECEMBER 2017 – REVISED OCTOBER 2019 INA381 26-V, High-Speed, Current Sense Amplifier With Integrated Comparator.

Key Features

  • 1 Common-mode input range:.
  • 0.2 V to +26 V.
  • High accuracy amplifier:.
  • Offset voltage at TA = 25°C.
  • 500 µV (maximum) at VCM = 12 V.
  • 150 µV (maximum) at VCM = 0 V.
  • Offset voltage drift: 1 µV/°C (maximum).
  • Gain error: 1% (maximum) at 25°C.
  • Gain error drift: 20 ppm/°C (maximum).
  • Available amplifier gains:.
  • INA381A1: 20 V/V.
  • INA381A2: 50 V/V.
  • INA381A3: 100 V/V.
  • INA381A4: 200 V/.

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