TIDA-00772
18-V/400-W 98% Efficient Compact Brushless DC Motor Drive w/Stall Current Limit Reference Design
TIDA-00772
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
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
TIDCCA2.ZIP (333 K)
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
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 sheetAnalog temperature sensors
LMT87 — ±2°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain
Data sheetBrushless DC (BLDC) motor drivers
DRV8305 — 45-V max 3-phase smart gate driver with current shunt amplifiers & SPI
Data sheetMSP430 microcontrollers
MSP430G2553 — 16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer
Data sheetNoninverting buffers & drivers
SN74LVC126A — 4-ch, 1.65-V to 3.6-V buffers with 3-state outputs
Data sheetStart development
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 |
| More literature | TIDA-00772 Firmware | Jun. 09, 2016 |
Related design resources
Reference designs
REFERENCE DESIGN
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