18-V/400-W 98% Efficient Compact Brushless DC Motor Drive w/Stall Current Limit Reference Design


Design files


The TIDA-00772 is a 18 A RMS drive for a three phase brushless DC (BLDC) motor in power tools operating from a 5-cell Li-ion battery with a voltage up to 21 V. This design is a 45 x 50 mm compact drive implementing sensor-based trapezoidal control. The design uses a discrete, compact MOSFET-based three-phase inverter delivering 18 A RMS continuous (60 A peak for 1 second) winding current, without any external cooling or heat sink. The slew rate control and charge pump of the gate drive ensures maximum inverter efficiency (>98% at 18V DC) and optimum EMI performance. The cycle-by-cycle overcurrent protection feature protects the power stage from large stall currents and the board can work up to 55°C ambient. The small form factor enables flexible mounting of board, high efficiency brings more battery duration and the 60 A peak current capability provides high momentary peak torque in power tools.

  • Operates at voltage from  5 V to 21 V (5-cell Li-ion battery) with up to 18-ARMS continuous (60A peak for 1 second) winding current without heat sink or airflow
  • Small PCB form factor of 45mm x 50mm
  • Optimum inverter efficiency (>98% at 18 V) and EMI performance by using low RDS_ON NexFETs and utilizing the slew rate control and charge pump feature of the gate driver
  • Cycle –by-cycle overcurrent protection with <1us response time and short circuit latch protection by VDS sensing
  • Shoot-through, under voltage, over temperature and blocked rotor protection
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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.

TIDUBX0.PDF (11349 K)

Reference design overview and verified performance test data

TIDRM70.PDF (1334 K)

Detailed schematic diagram for design layout and components

TIDRM71.PDF (56 K)

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

TIDRM72.PDF (311 K)

Detailed overview of design layout for component placement

TIDRM74.ZIP (2014 K)

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


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

TIDRM73.PDF (2560 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD18502Q5B40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.3 mOhm

Data sheet: PDF | HTML
Analog temperature sensors

LMT87±2°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain

Data sheet: PDF | HTML
BLDC drivers

DRV830545-V max 3-phase smart gate driver with current shunt amplifiers & SPI

Data sheet: PDF | HTML
MSP430 microcontrollers

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

Data sheet: PDF
Noninverting buffers & drivers

SN74LVC126A4-ch, 1.65-V to 3.6-V buffers with 3-state outputs

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide 18-V/400-W 98% Efficient Compact Brushless DC Motor Drive Design Guide Aug. 23, 2016

Related design resources

Reference designs

TIDA-00771 10.8V/250W, 97% Efficient,Compact Brushless DC Motor Drive w/Stall Current Limit Reference Design

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