The TI Reference Design Library is a robust reference design library spanning analog, embedded processor, and connectivity. Created by TI experts to help you jump start your system design, all reference designs include schematic or block diagrams, BOMs, and design files to speed your time to market. Search and download designs at the Select TI reference designs page.
36V/1kW Brushless DC Motor Drive with Stall Current Limit of <1us Response Time Reference Design
This reference design is a power stage for brushless motors in battery-powered garden and power tools rated up to 1 kW, operating from a 10-cell lithium-ion battery with a voltage range from 36 V to 42 V. The design uses 60-V, N-channel NexFET™ technology featuring a very low drain-to-source resistance (RDS_ON) of 1.8 mΩ in a SON5x6 SMD package, which results in a very small PCB form factor of 57 mm × 59 mm. The 3-phase gate-driver is used to drive a 3-phase MOSFET bridge, which can operate from 6 V to 60 V and supports programmable gate current with a maximum setting of 2.3-A sink/1.7-A source. The C2000 F28027 LaunchPad™ development kit (LAUNCHXL-F28027) is used with this power stage, and 120-degree trapezoidal control of BLDC motor with Hall sensors is implemented in software. The cycle-by-cycle current limit feature in the gate-driver protects the board from excessive current that is caused during motor stalls, by limiting the maximum current allowed in the power stage to a safe level.
Single-Ended Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors
This design provides a 4-channel signal conditioning solution for single-ended SAR ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external SAR ADCs as well as circuits for high-speed overcurrent and earth fault detection. Proper signal conditioning improves noise immunity on critical current measurements in motor drives. This reference design can help increase the effective resolution of the analog-to-digital conversion, improving motor drive efficiency.