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


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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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD88599Q5DC  60-V, N channel synchronous buck NexFET™ power MOSFET, SON 5 mm x 6 mm Dual-Cool™ power block, 40 A  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
DRV8323R  65-V max 3-phase smart gate driver with buck regulator & current shunt amplifiers  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
LMT87-Q1  Automotive ±2.7°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain  Temperature sensors  Sample & Buy Not Available
MSP430F5132  25 MHz MCU with 8KB Flash, 1KB SRAM, 10-bit ADC, comparator, DMA, 16-bit High Resolution timer  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD88599Q5DC Download Download
DRV8323R Download Download
LMT87-Q1 Download
MSP430F5132 Download -
Download -
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 6315 30 Aug 2017
Design files (6)
Title Type Size (KB) Date
ZIP 1572 30 Aug 2017
ZIP 2709 30 Aug 2017
PDF 1582 30 Aug 2017
PDF 202 30 Aug 2017
PDF 102 30 Aug 2017
PDF 902 30 Aug 2017
More literature (1)
Title Type Size (KB) Date
ZIP 4779 30 Aug 2017

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