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TIDA-00772

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

Design files

TIDA-00772

Design files

Overview

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.

Features
  • 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.

download Design guide — TIDA-00772
TIDUBX0.PDF (11349 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00772
TIDRM70.PDF (1334 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00772
TIDRM71.PDF (56 K)

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

download Assembly drawing — TIDA-00772
TIDRM72.PDF (311 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00772
TIDRM74.ZIP (2014 K)

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

download Gerber file — TIDA-00772
TIDCCA2.ZIP (333 K)

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

download PCB layout — TIDA-00772
TIDRM73.PDF (2560 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD18502Q5B — 40-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

DRV8305 — 45-V max 3-phase smart gate driver with current shunt amplifiers & SPI

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430G2553 — 16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer

Data sheet: PDF
Noninverting buffers & drivers

SN74LVC126A — 4-ch, 1.65-V to 3.6-V buffers with 3-state outputs

Data sheet: PDF | HTML

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Software

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

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

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