Reference Design for Automotive, Proportional-Solenoid Current Sensor


Design files


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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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUDF9.PDF (1891 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA240-Q1AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection

Data sheet: PDF | HTML
High-side switches

TPS1H100-Q140-V, 100-mΩ, 1-ch automotive smart high-side switch with adjustable current limit

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709-Q1Automotive 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection

Data sheet: PDF | HTML

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* Design guide Reference Design for Automotive, Proportional-Solenoid Current Sensor Nov. 14, 2017

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