5V, 3-Phase, Sensorless Motor System With Variable Speed Control


Design files


This reference design provides a simple way to spin and control a 5V, 3-phase, BLDC fan motor with minimum development time and overhead. It utilizes the DRV10866, a sensorless BLDC motor driver, for the power stage and a TLC555 timer to provide a variable duty cycle PWM signal for speed control. The DRV10866 uses a 150 degree sensorless BEMF control scheme that takes away the need for external sensors on the motor.

  • Low Voltage, 150 Degree BEMF Sensorless Motor Control
  • Speed Control Through Onboard Potentiometer
  • Compact Board Size (Can Fit Onto Fan Itself)
  • Can Be Powered From Micro-USB Cable, No Power Supply Required
  • Low Development Overhead, Design is Orderable and Tested
  • No Firmware Required, No MCU Required
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Design files & products

Design files

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

TIDU004.PDF (162 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDC025.ZIP (138 K)

Detailed schematic diagram for design layout and components

TIDR292.PDF (68 K)

Detailed schematic diagram for design layout and components

TIDR293.PDF (101 K)

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


Includes TI products in the design and potential alternatives.

Integrated control BLDC drivers

DRV108665-V nominal, 0.85-A peak sensorless trapezoidal control, 3-phase BLDC motor driver

Data sheet: PDF | HTML

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Evaluation board

DRV10866EVM — DRV10866 Evaluation Module for 5V, 3-Phase, Sensorless, Brushless DC Motor Driver

The DRV10866EVM (evaluation module) provides a cost effective, low voltage, sensorless-solution for running a 3-phase BLDC motor in 150 degree trapezoidal commutation.
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Technical documentation

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Type Title Date
Test report TIDA-00112 Test Results Nov. 13, 2013

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