25.2-V, 30-A High-speed sensorless (> 100 krpm) brushless DC motor drive reference design
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Key Document


This reference design is for high-speed sensorless trapezoidal control of 6–33.6 V DC-fed brushless DC (BLDC) motors up to 900 W and motor speeds of up to 180,000 rpm (verified up to 100,000 rpm). A costeffective smart microcontroller with a hardware detection of the commutation points accelerates the sensorless trapezoidal control using speed-adaptive Back EMF (BEMF) detection. The BLDC power stage is compact, optimized for efficiency, and fully protected against short circuit, motor stall, and overtemperature, due to the smart three-phase gate driver.

  • High-speed, sensorless trapezoidal control up to 3-kHz motor electrical frequency
  • Speed-adaptive dual-algorithm for BEMF detection
  • Operates at voltage ranging from 6 V to 33.6 V delivering up to 900-W output power, output current up to 30A RMS
  • Standby current consumption as low as 22 µA
  • Optimized FET switching for best efficiency and EMI
  • Cycle-by-cycle overcurrent, motor stall and short-circuit latch protection by MOSFET VDS monitoring

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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18514Q5A  40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.9 mOhm  MOSFETs  Sample & Buy Not Available
DRV8320  65-V max 3-phase smart gate driver  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR2355  24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18514Q5A VSONP (DQJ)| 8 Download Download
DRV8320 Download Download
MSP430FR2355 Download Download
Download Download
Download Download
Download Download
TPS709 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 9046 15 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 448 15 Jan 2019
ZIP 670 15 Jan 2019
PDF 852 15 Jan 2019
PDF 162 15 Jan 2019
PDF 57 15 Jan 2019
PDF 383 15 Jan 2019
More literature (1)
Title Type Size (KB) Date
ZIP 1726 15 Jan 2019

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