Reference Design for Automotive, Proportional-Solenoid Current Sensor
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Key Document


Precision control of automotive proportional solenoids is necessary to achieve the precise control in an automatic transmission, in electronic fuel injectors, and in several automotive actuator applications. In proportional solenoids, the current flowing through the coil is directly  oportional to the magnetic field generated. The designer can estimate armature position by knowing the current that is flowing through the solenoid. By forming a closed-loop solenoid control with high-accuracy current sensors, the designer is able to control the proportional  olenoid in a precise manner. This order of control implies that highaccuracy current sensors are critical to achieve precise control of solenoids. Some of the main aspects to consider when selecting a current sensor are less offset, less drift, and higher pulse-width-modulation (PWM) rejection ration. By combining the above three features, this reference design shows a way to precisely measure the current flowing through the solenoid using TI's current shunt monitoring portfolio.

  • Uncalibrated accuracy: less than 1% for more than 10 mA over temperature (–40°C to 125°C)
  • Suitable for various solenoid current ranges
  • Low drift, high precision
  • High-side drive, high-side solenoid monitor
  • Enhanced PWM rejection facilitates uniform current profile
  • Lowers blanking time and enables accurate measurements at lower duty cycle

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA240-Q1  AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS1H100-Q1  40-V, 100-mΩ, 1-ch automotive smart high-side switch with adjustable current limit  Power switches  Not Available View Design Kits & Evaluation Modules
TPS709-Q1  Automotive 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA240-Q1 Download
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TPS1H100-Q1 Download Download
TPS709-Q1 Download Download
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User guide (1)
Title Type Size (KB) Date
PDF 1891 14 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 335 19 Dec 2017
ZIP 448 19 Dec 2017
PDF 348 19 Dec 2017
PDF 79 19 Dec 2017
PDF 52 19 Dec 2017
PDF 189 19 Dec 2017

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