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DRV8302

akash chaurasia
Prodigy 30 points
Other Parts Discussed in Thread: DRV8302

iam try to make a 3 phase bldc motor controller using drv8302.My motor run with my pcb (but MOSFETs on the breadboard not on the PCB) but when i shift the MOSFETs on the PCB then my IC got burn.

can u please help me with this.

  • 0
    TI__Guru 74282 points
    Akash,

    This thread has been moved to the Motor Drivers forum for more appropriate support.

    Regards,
  • 0 in reply to Eric Hackett
    TI__Guru** 114905 points
    Hi Akash,

    What is different about the MOSFETs on the PCB vs the breadboard?
    Is the surrounding components the same?
    What is the PVDD voltage?
  • 0 in reply to Rick Duncan
    Prodigy 30 points

    yes,placement of the mosfets changes.On the PCB all the mosfets are in a line (side by side) while on the breadboard 3 high side mosfets are in a line and 3 low side mosfets are in a other line (Faces of the mosfets are towards each other).And while using MOSFETs on the breadboard ,the current in the mosfets flows in the breadboard not in the PCB.


    Above testing was done with PVDD voltage of 39V.


    If i use the PVDD of 55V the IC burned even using the mosfets on the breadboard(After giving about 20% throttle).

    And with PVDD of 24V the IC work perfectly even using the mosfets on the PCB.

    I am trying to run 1kw motor @48V for automotive purpose. using IRF260n mosfets.Total gate charge of the mosfets is 234nC.

    Can gate charge of the mosfets create the problem???

  • 0 in reply to akash chaurasia
    TI__Guru** 114905 points
    Hi Akash,

    At 55V, there could be voltage spikes on PVDD that exceed the absolute maximum ratings of the device.

    Please examine the voltage spikes at 24V when operating. This can be used as an indicator at 55V.

    You may need to increase the system bulk capacitor to reduce the voltage spikes.
  • 0 in reply to Rick Duncan
    Prodigy 30 points

    At 24V spikes of 5V occur at SH_X pins (means 39V with respect to GND) without connecting the motor.

    At 55V spikes of approx 6V occur at SH_X pins (means 61V with respect to GND) without connecting the motor.Do the spikes increases after connecting the motor?

    I am using 3000uF bulk capacitor.I think that is enough for 1KW motor.

    Can u please tell me how to calculate the bootstrap,GVDD,AVDD capacitor and gate resistor values?