Efficiency, protection, and integration are important design factors for compact DC-fed drives up to 60VDC. This reference design shows a three-phase inverter with nominal 48-V DC input and a 10-ARMS output current. The 100-V intelligent three-phase gate driver DRV8350R with integrated buck converter and six 100-V NexFET™ power MOSFETs with ultra-low gate charge enable high efficiency of the power stage. Using the internal protection features of the DRV8350R, the power stage is protected against overtemperature, overcurrent, and short-circuit between the motor terminals and motor terminals to ground. Precision phase current sensing is achieved using the INA240. The interface is a 3.3-V I/O to connect a host MCU like the C2000™ MCU for brushless AC motor control.
Features
- Three-phase inverter with 24-60VDC input and 10 Arms continuous phase current for servo drives
- Very high peak efficiency (99.0%) eliminates need for heat sink or cooling fan
- Smart three phase gate driver DRV8350R with on-chip hardware protection and integrated DC/DC buck for gate drive supply
- Fully protected power stage: Shoot-through, over current, short circuit, under voltage, over temperature protection
- Programmable gate driver source/sink currents from 50mA to 2A eases optimization of efficiency and EMI performance including VGS handshake and minimum dead-time insertion to avoid shoot-through
- In-phase shunt measurement based (1mOhm) current sensing with INA240 high-common mode rejection zero-drift current sense amplifier