12V BLDC Server Fan with Sensorless Sinusoidal Control
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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.

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DRV10975  12-V nominal, 2-A peak sensorless sinusoidal control 3-phase BLDC motor driver  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DRV10975 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 517 17 Mar 2015
Design files (6)
Title Type Size (KB) Date
ZIP 149 17 Mar 2015
ZIP 150 17 Mar 2015
PDF 300 17 Mar 2015
PDF 61 17 Mar 2015
PDF 198 17 Mar 2015
PDF 136 17 Mar 2015
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