10.8V/250W Compact Brushless DC Motor Driver Reference Design with 97% Efficiency and Stall Current Limit

The TIDA-00771 is a 20A RMS driver for three-phase brushless DC (BLDC) motors in power tools powered by 3-cell Li-ion batteries (voltage range 5V to 12.6V). The design is a compact 45 x 50 mm actuator that enables sensor-based trapezoidal control. The design uses a discrete compact MOSFET-based three-phase inverter that delivers 20A RMS continuous (70A peak for 1 second) winding current without the need for any external cooling devices or heat sinks. The gate driver's slew rate control and charge pump ensure maximum inverter efficiency (>97% at 10.8V DC) from 5V to 12.6V with optimal EMI performance. Cycle-by-cycle overcurrent protection prevents large stall currents in the power stage, and the board can operate in ambient temperatures up to 55°C. The small form factor allows placement of the plate close to the battery pack, the high efficiency allows the battery to last longer, and the 70A peak current capacity delivers high instantaneous peak torque in power tools.

characteristic

• ● Operates from 5V to 12.6V (3-cell Li-Ion) with up to 20A RMS continuous (70A peak for 1 second) winding current without heatsink or airflow
• ●PCB compact size: 45mm x 50mm
• ● Best inverter efficiency (>97% at 10.8V) from 5V to 12.6V with best EMI performance by using the gate driver's slew rate control and charge pump functionality
• ● Cycle-by-cycle overcurrent protection, response time is less than 1us, and short-circuit latch protection is provided through VDS sensing
• ● Breakdown protection, under-voltage protection, over-temperature protection and rotor stall protection