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Any Logic chips/solutions to avoid backflow current

fang circle
Prodigy 210 points
Other Parts Discussed in Thread: TMS320F28335, DRV8412

Hi there,

I am planning to use PWM signal from C2000 DSP (TMS320F28335) to drive brused motor via DRV8412 (MOSFET bridge). The good news is: PWM VHO from C2000 is around 3.3v, and safe VHI to drive DRV8412  is between 2v-3.6v, so basically i don't think I need voltage level translation here, which can simplify hardware design, and is also good for performance.

However, it may be dangerous to drive MOSFET with PWM directly from C2000, since high frequency PWM may result in backflow current which further damage DSP. 

I checked some isolators but it seems no chips are good for my application.

So, any advice for me?

Thanks.

  • 0
    Expert 2420 points

    Hi,

    I do not really understand the problem you are afraid of. Because you will not be driving the MOSTs directly. There is a lot of circuitry inside the motor driver for timing, protection, level shifting, gate driving and so on. Hence, I see nothing dangerous for the DSP. Moreover when using such a motor driver you will not be dealing with really huge currents, just some Amperes. (I never had a problem with the combination of a DSP with such a motor driver).

    Best regards,
    Edwin Krasser