12- to 24-V, 27-A Brushed DC Motor Reference Design
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Key Document


Brushed motors are a relatively popular option for motor designs because of their low price and simple control scheme.  A brushed motor has a wire-wound rotor and permanent magnet stator.  The commutation of the motor is achieved using conductive rings that are connected to the rotor using brushes that scrape against the commutator rings.  This allows the direction of current through the motor to change based on the orientation of the brushes and different commutation rings.  Utilizing an H-Bridge allows for easy direction and speed control changes to be applied quickly and efficiently to the brushed DC motor.  An electronic drive is required to control the motor currents in a brushed DC motor.  The electronic drive circuit consists of a power stage with two-phase inverter meeting the required power capability, a microcontroller to implement the motor speed commands and fault handling, current sensing for motor startup / stall protection, gate driver for controlling the two-phase inverter, and a power supply for microcontroller and other low voltage devices.

  • 343 Watt RMS Power Stage with MSP430G2553 Control Scheme
  • Tested to operate with 18 Volt External Battery
  • Delivers up to 27.47 ARMS Continuous Motor Current with No External Heat Sinking or Air Flow Aids
  • Dual Layer, Small PCB Form Factor of 76.3 mm by 38.1 mm
  • Utilizes TI’s 60 V N-Channel NexFETs with an RDS of 1.8 mΩ Packaged In a SON 5-mm × 6-mm footprint
  • User Configurable Gate Drive Current Allows for Ease in Adapting to Custom MOSFET Selection

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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
CSD18540Q5B  60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
DRV8701  47-V H-bridge smart gate driver  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
LMT86  2.2V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
MSP430G2553  16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18540Q5B VSON-CLIP (DNK)| 8 Download Download
DRV8701 Download Download
LMT86 Download
MSP430G2553 Download
Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3082 12 Oct 2015
Design files (6)
Title Type Size (KB) Date
ZIP 988 12 Oct 2015
ZIP 863 12 Oct 2015
PDF 1053 12 Oct 2015
PDF 154 12 Oct 2015
PDF 212 12 Oct 2015
PDF 381 12 Oct 2015
More literature (1)
Title Type Size (KB) Date
ZIP 47 12 Oct 2015

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