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DRV8307 for BLDC at 28V

Andy Tuthill74
Prodigy 20 points
Other Parts Discussed in Thread: DRV8307, DRV8308

I have a design on the horizon that requires a 28VDC brushless DC motor pulling up to 200 amps.  I'm thinking of using a IGBT module instead of mosfets.  I'm looking through app notes and other information but wanted to ask here for advice as well.  The IGBT is different enough from mosfet half bridges I want to ask before I'm really under pressure to deliver a design.

It looks like I could use the DRV8307 as the gate driver for the 3 phase motor but it's apparently more intended for mosfets. Is this driver suitable or is there another gate driver I should use?

Thanks,

Andy

  • 0
    TI__Mastermind 20985 points
    Andy, the DRV8307 is designed to drive N-channel MOSFETs, and it wouldn't work to just replace those with IGBTs. Besides voltage level differences, the output PWM frequency is 25kHz, which I think is too fast for IGBTs which have high switching loss.

    The DRV8308 with N-channel MOSFETs would be the better choice. The DRV8307 has a fixed gate drive current of 30mA, whereas the DRV8308 is configurable up to 130mA. 200A FETs are going to have a large gate capacitance to overcome, and 130mA would be more suitable for reasonable switching times.

    Do you need 200A from your motor, or is that just tied to a motor spec? The DRV8308 easily lets you limit motor current based on the VLIMITER. For example, you could cap peak current to 100A if you wanted, using 2.5 milliohm sense resistance.

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 20 points
    The spec is for the motor to have peak drive at 200 amps which will be around 4800 rpm. There will be a 100 amp version but I'm only designing to the peak spec. I'd prefer to use mosfets but want to consider the IGBT option for the current rating. I need to offer a few options for the initial design review.
    Thanks,
    Andy