54-V: 1.5 kW: >99% Efficient: 70x69 mm2 power stage reference design for 3-phase BLDC drives
Description
This reference design demonstrates a 1.5-kW power stage for driving a three-phase brushless DC motor in cordless tools operating from a 15-cell Li-ion battery with a voltage up to 63-V. The design is a 70mm x 69mm compact drive: bringing 25-ARMS continuous current at 20-kHz switching frequency without heat sink and with natural convection: implementing sensorbased trapezoidal control. The design achieves optimized MOSFET switching loss and EMI by using a smart gate driver with optimized MOSFET and PCB. The design shows MOSFET operation within the safe operating area using enhanced protections including MOSFET over current and shoot-through protection by VDS monitoring: gate protection: switching voltage spike optimization with slew rate control and over temperature protection.
Features
- Operates at voltage ranging from 9 V to 63 V (15s li-ion battery) delivering 25 ARMS continuous current: 400-A peak54 V/1.5 kW: 25 ARMS support without heat sink in a small 70mm x 69mm PCB form factorMore than 99% efficiency at 20 kHz trapezoidal control for 54 V/1.5 kWMOSFET over current protection by VDS sensing with response time less than 1-µs with additional 4-µs deglitch time to eliminate false tripsEnhanced protection at MOSFET gate including VGS under-voltage: over-voltage: gate to source short circuit and open circuit protections
Applications
- Cordless power tool
- Cordless handheld garden tool
- Lawn mower
- Linear motor power stage
- 2-wheeler & 3-wheeler traction drive
Product Categories
- Motor drivers