36-V, 1-kW, 99% Efficient, 18-cm2 Power Stage Reference Design for Three-Phase BLDC Motors


Design files


This 1kW power stage reference design achieves 99% efficiency for a three-phase, 36V brushless DC (BLDC) motor used in industrial applications such as power tools that operate from a 10-cell Li-ion battery. The design demonstrates the smallest inverter power stage for this power levels, implementing sensorbased trapezoidal control and supports 25ARMS continuous (60A peak for 2 seconds, 100A peak for 400 milliseconds) winding current. The design’s MOSFET power block and current controlled gate driver helps clean MOSFET switching and lowest EMI due to slew rate control and low parasitic inductance.

  • Operates at voltage ranging from 6V to 42V (10s li-ion battery) delivering 25ARMS continuous (60A peak for 2s, 100A peak for 400ms, 400A for 10ms) motor winding current
  • 36V/700W, 18ARMS support without heat sink in a small 50mm x 36mm PCB form factor
  • MOSFET current monitoring and overcurrent protection by VDS sensing with response time less than 1µs
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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.

TIDUDE5.PDF (6315 K)

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

TIDRSH7.ZIP (2709 K)

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

TIDCDS4.ZIP (1572 K)

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

TIDRSH6.PDF (1582 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT87-Q1Automotive ±2.7°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain

Data sheet: PDF | HTML
BLDC drivers

DRV8323R65-V max 3-phase smart gate driver with buck regulator & current shunt amplifiers

Data sheet: PDF
MSP430 microcontrollers

MSP430F513225 MHz MCU with 8KB Flash, 1KB SRAM, 10-bit ADC, comparator, DMA, 16-bit High Resolution timer

Data sheet: PDF | HTML
Power blocks

CSD88599Q5DC60-V, N channel synchronous buck NexFET™ power MOSFET, SON 5 mm x 6 mm Dual-Cool™ power block, 40 A

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide 36-V/1-kW, 99% Efficient, 18-cm2 Power Stage Ref Design for 3-Phase BLDC Motors Aug. 30, 2017

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