54-V, 1.5 kW, >99% Efficient, 70x69 mm2 power stage reference design for 3-phase BLDC drives


Design files


This reference design demonstrates a 1.5-kW power stage for driving a three-phase brushless DC motor in cordless tools operating from a 15-cell Li-ion battery with a voltage up to 63-V. The design is a 70mm x 69mm compact drive, bringing 25-ARMS continuous current at 20-kHz switching frequency without heat sink and with natural convection, implementing sensorbased trapezoidal control. The design achieves optimized MOSFET switching loss and EMI by using a smart gate driver with optimized MOSFET and PCB. The design shows MOSFET operation within the safe operating area using enhanced protections including MOSFET over current and shoot-through protection by VDS monitoring, gate protection, switching voltage spike optimization with slew rate control and over temperature protection.

  • Operates at voltage ranging from 9 V to 63 V (15s li-ion battery) delivering 25 ARMS continuous current, 400-A peak
  • 54 V/1.5 kW, 25 ARMS support without heat sink in a small 70mm x 69mm PCB form factor
  • More than 99% efficiency at 20 kHz trapezoidal control for 54 V/1.5 kW
  • MOSFET over current protection by VDS sensing with response time less than 1-µs with additional 4-µs deglitch time to eliminate false trips
  • Enhanced protection at MOSFET gate including VGS under-voltage, over-voltage, gate to source short circuit and open circuit protections
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRZV4.ZIP (4526 K)

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


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

TIDRZV3.PDF (1816 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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TIDCFI3 TIDA-010056 Firmware

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Type Title Date
* Design guide 54-V, 1.5 kW, >99% Efficient, 70x69 mm^2 Power Stage Reference Design (Rev. A) Jul. 31, 2019

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