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18-V/400-W 98% Efficient Compact Brushless DC Motor Drive w/Stall Current Limit Reference Design
TIDA-00772
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
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.
