Hello,
We are in the process of developing a motor controller board using the DRV8306 IC and we would need a design review of the schematic before we proceed to layout. Attached you can find the PDF of the schematic, Altium design files and the datasheets of the used BLDC motor.
Here are some specifications of the application:
Battery voltage (motor voltage) V_m = 12.5 ~ 21 Vdc
Nominal motor current I_nom = 66 A
Stall motor current I_stall = 326 A
PWM modulation freq. f_pwm < 20kHz
I would also like to ask about the overcurrent protection features. How should I design them for the given application? If I want to use the V_DS_OCP feature as a thermal (RMS) protection therefore at 80 A phase current and 0.6mR of mosfet R_ds_on, gives me 80A * 0.6mR = 48mV. The lowest V_DC_OCP setting is 150mV so I guess this feature will not be effective?
Designing the cycle-by-cycle current protection to withstand the 326 A of stall current, I have chosen a 500uR shunt which will set the overcurrent protection at 500 A. Was this a smart decision?
Thank you for all the help and advice.
Best regards,
Samo Smodiš
Files:
231004 AlphaProto MotorDriver v01-1.zip
