TIDUF77 June 2024 MSPM0G1507
The DRV7308 is a three phase motor driver IPM that consists of 205mΩ, 650V e-mode Gallium- Nitride (GaN) for driving three-phase BLDC motors up to 450V DC rails. These applications include field oriented control (FOC), sinusoidal current control, and trapezoidal current control of BLDC motors. The device integrates the pre-drivers for all the GaNFETs with slew rate control of phase node voltages. The device helps to achieve more than 99% efficiency for a 3-phase modulated FOC driven 250W motor drive application in a QFN 12mm x 12mm package, eliminating the need of heat sink. The device enables minimum dead time and hence ultra quiet operation even without dead time compensation.
The integrated bootstrap rectifier with current limit eliminates the need for an external bootstrap diode with related reverse recovery inefficiency and also eliminates the external current limit resistor. The DRV7308 brings out all the three low side source pins of the GaN FETs to support 3- or 2- or 1-shunt current sensing. The device integarets a 12MHz, 15V/μs operational amplifier for single shunt current sensing in FOC and trapezoidal control of BLDC motors.