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


Design files


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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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.

TIDUAW3.PDF (3082 K)

Reference design overview and verified performance test data

TIDRI70.PDF (381 K)

Detailed schematic diagram for design layout and components

TIDRI71.PDF (212 K)

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

TIDRI72.PDF (154 K)

Detailed overview of design layout for component placement

TIDRI74.ZIP (863 K)

Files used for 3D models or 2D drawings of IC components

TIDCB82.ZIP (988 K)

Design file that contains information on physical board layer of design PCB

TIDRI73.PDF (1053 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Brushed DC (BDC) motor drivers

DRV870147-V H-bridge smart gate driver

Data sheet: PDF | HTML
Analog temperature sensors

LMT862.2V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430G255316 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer

Data sheet: PDF
N-channel MOSFETs

CSD18540Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide TIDA-00620 Test Results Oct. 12, 2015

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