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Texas Instruments INA790A/INA790B Bidirectional Amplifiers

Texas Instruments INA790A/INA790B Bidirectional Amplifiers are designed with enhanced Pulse Width Modulation (PWM) rejection circuitry to suppress large (dv/dt) common-mode signals. The INA790B also enables real-time continuous current measurements in switching systems. These measurements are critical for inline current measurements in motor-drive applications and for solenoid valve control applications. The INA790B voltage output amplifier features an integrated shunt resistor of 400µΩ and monitors bidirectional current over a common-mode range of -4V to 110V, independent of the supply voltage. An adjustable gain option helps to optimize the system's dynamic range. Texas Instruments INA790B Bidirectional Current Sense Amplifier operates from a single 2.7V to 5.5V power supply, drawing a maximum supply current of 3.75mA. The INA790A/INA790B current sense amplifiers feature an operating temperature range of -40°C to 125°C and are available in a 15-pin VQFN package.

Features

  • Precision solution with integrated shunt resistor
  • Wide common-mode voltage range
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
  • Analog gain set
  • High measurement accuracy
  • Adjustable gain with external resistor divider network
  • VQFN-15 package

Applications

  • Motor drives
  • Solenoids and actuators
  • Injection molding machines
  • Cordless power tools
  • Medical cordless tools
  • Drone propeller speed control

Specifications

  • 75A continuous current (maximum)
  • 400µΩ shunt resistor
  • 2nH shunt inductance
  • 110V common-mode voltage (maximum)
  • -4V common-mode voltage (minimum)
  • 1% gain error
  • 5.5V supply voltage (maximum)
  • 2.7V supply voltage (minimum)
  • -40°C to +125°C operating temperature range

Typical Application

Application Circuit Diagram - Texas Instruments INA790A/INA790B Bidirectional Amplifiers

Additional Resources

Related Amplifiers

Texas Instruments INA791B Bidirectional Current Sense Amplifier

Integrated shunt resistor of 400µΩ, designed to monitor bidirectional current over -4V to 110V.

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Evaluation Modules

Texas Instruments INA79xEVM Evaluation Modules

Allows users to evaluate the INA790x and INA791x current-sense amplifiers.

Learn Moreabout Texas Instruments INA79xEVM Evaluation Modules View Productsrelated to Texas Instruments INA79xEVM Evaluation Modules
Published: 2024-05-31 | Updated: 2025-11-07