Electronically Commutated Motor Reference Design for HVAC Blowers with Low BOM Cost


Design files


The TIDA-01353 reference design is a discrete MOSFET based three-phase ECM control module for driving brushless (BLDC) motors rated up to 375W in HVAC blower applications using a sensorless trapezoidal control method. The cycle-by-cycle overcurrent protection feature protects the power stage from over currents and the board can work up to an ambient temperature of 85°C. This design also incorporates opto-isolation for 5 preset blower speed terminals available to the user, and is a direct replacement reference design for permanent split capacitor (PSC) motors.

  • On-board temperature sensing
  • Opto-coupling for circuit isolation
  • Low cost, high efficiency sensorless ECM motor controller
  • Current sensing using single shunt reistor on DC bus
  • Sensorless trapezoidal control using the TI InstaSPIN-BLDC back-EMF integration method
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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

TIDRPD0.PDF (2672 K)

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

TIDRPD4.ZIP (2391 K)

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

TIDCD21.ZIP (1185 K)

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

TIDRPD3.PDF (3604 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT841.5V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92

Data sheet: PDF | HTML
ESD protection diodes

TPD1E10B0612-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package

Data sheet: PDF | HTML
Flyback controllers

UCC28881700-V Lowest Quiescent current off-line switcher

Data sheet: PDF | HTML
General-purpose op amps

TLV316Single, 5.5-V, 10-MHz, RRIO operational amplifier

Data sheet: PDF | HTML
Half-bridge drivers

UCC277144-A, 600-V half bridge gate driver

Data sheet: PDF | HTML
MSP430 microcontrollers

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

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Electronically Commutated Motor Ref Design for HVAC Blowers With Low BOM Cost (Rev. A) Feb. 23, 2017
White paper How to optimize building and home automation designs for energy efficiency Apr. 08, 2020

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