12V BLDC Server Fan with Sensorless Sinusoidal Control


Design files


This is a reference design for a 12V 3-phase brushless DC fan, intended for server cooling applications.  It is based on a single IC controller, the DRV10975, which drives sensorless BLDC motors with sinusoidal current that minimizes acoustic noise and torque ripple.  The design requires no microcontroller or firmware, enabling a faster time to market.

  • Cost-optimized and high performance.
  • Runs Sunon's standard off the shelf  BLDC  fan (SG40281B1), and PCB matches the form factor.
  • Supports 20k RPM with 12V 7W input.
  • Sinusoidal sensor-less control at 25kHz for minimized torque ripple and audible noise.
  • Flexible support across other fan models with its tunable register settings.
  • Design has been built and proven.
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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.

TIDU860.PDF (574 K)

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


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

TIDC973.ZIP (149 K)

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.

Integrated control BLDC drivers

DRV1097512-V nominal, 2-A peak sensorless sinusoidal control 3-phase BLDC motor driver

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
Test report TIDA-00525 Test Results Mar. 17, 2015

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