Hi guys
I am working on a new motor controller solution for 250W/500W/1500W. The approach is design the same three-phase inverter architecture for each power rate. This controller is focused on E-Bikes and Small electric vehicles with a Li-ion Battery: 36Vnom(30-42V) or 51Vnom(40-58V)
I want to use the DRV8301at each board (250W/500W/1500W) just changing the 6 mosfets, this will make easy the PCB design. But I have the following questions:
1.- Considering that each board (250W/500W/1500W) has a different Mosfet (different Qg), How can I calculate the GATE_CURRENT (Gate driver peak current 1.7A/0.7A/0.25A) value of the DRV8301 in order to enable properly the mosfet gates? I have been looking for this calculation in the DRV8301 datasheet but I cannot find it
2.- In the 51V Battery solution, the DCBUS can be 58V when battery is fully charged. DRV8301 datasheet says: PVDDnom=60V; PVDDmax= 70V. Do you recommend to use the DRV8301 when battery is fully charged? Remember that motor bEMF can increase the DCBUS over 58V
3.- I want to use the buck converter of the DV8301 for generate a 15V-1A power supply in order to feed 3V and 5V power supplies for the MCU. What is the efficiency of this buck converter at this configuration when the PVDD1 is 58V? I want to calculate the device dissipation but there is not an example at this configuration in the datasheet.
Thanks in advance
