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18-V/400-W 98% Efficient Compact Brushless DC Motor Drive w/Stall Current Limit Reference Design TIDA-00772 (ACTIVE)
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Key Document
- 18-V/400-W 98% Efficient Compact Brushless DC Motor Drive Design Guide
(PDF 11349 KB)
23 Aug 2016
Description
The TIDA-00772 is a 18 A RMS drive for a three phase brushless DC (BLDC) motor in power tools operating from a 5-cell Li-ion battery with a voltage up to 21 V. This design is a 45 x 50 mm compact drive implementing sensor-based trapezoidal control. The design uses a discrete, compact MOSFET-based three-phase inverter delivering 18 A RMS continuous (60 A peak for 1 second) winding current, without any external cooling or heat sink. The slew rate control and charge pump of the gate drive ensures maximum inverter efficiency (>98% at 18V DC) and optimum EMI performance. The cycle-by-cycle overcurrent protection feature protects the power stage from large stall currents and the board can work up to 55°C ambient. The small form factor enables flexible mounting of board, high efficiency brings more battery duration and the 60 A peak current capability provides high momentary peak torque in power tools.
Features
- Operates at voltage from 5 V to 21 V (5-cell Li-ion battery) with up to 18-ARMS continuous (60A peak for 1 second) winding current without heat sink or airflow
- Small PCB form factor of 45mm x 50mm
- Optimum inverter efficiency (>98% at 18 V) and EMI performance by using low RDS_ON NexFETs and utilizing the slew rate control and charge pump feature of the gate driver
- Cycle –by-cycle overcurrent protection with <1us response time and short circuit latch protection by VDS sensing
- Shoot-through, under voltage, over temperature and blocked rotor protection
See the Important Notice and Disclaimer covering reference designs and other TI resources.
