I am working on a motor controller design based on the DRV8307, and have the following questions:
1. The DRV8307 datasheet does not specify a parameter for dead-time during FET drive transitions. is this number available? We would like to know how much margin we have when considering FET on and off timing.
2. We are using TI's DRV8307EVM reference design and are modifying the drive section to support the BLDC motor indicated in the table below. There will also be a gearbox attached.
I am working out the details for interfacing International Rectifier IRFI1010NPbF power MOSFET for the inverter stage. We anticipate up to 10-20 amps for phase current. Are there particular recommendations for interfacing the DRV8307 to support this application? We have already worked out various details for adjusting sense resistor and bulk capacitance on the 24V supply bus, but we could use guidance on FET interfacing for the DRV8307 driver. Is selection of a sufficient gate resistor sufficient (for suppression of gate ringing and limited dV/dt), or should we consider other circuitry to keep the FETs within optimum operational limits?
I appreciate hearing any thoughts on the subject.
Thanks,
Aaron
Base motor, Bodine Electric model N3507 | ||
Speed (rpm) | 2500 | |
Rated Torque (oz-in) | 101 | |
Rated Voltage (volts) | 24 | |
Motor HP | 0.25 | |
Torque Constant (oz-in/A) | 9 | |
Voltage Constant (V/krpm) | 6.7 | |
Winding Resistance (ohms) | 0.17 | |
Winding Inductance (mH) | 0.4 |