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DRV8301: Protection of DRV8301 and MOSFETS

Roman Simonyan
Intellectual 440 points
Part Number: DRV8301
Other Parts Discussed in Thread: DRV8305

This schematic is used to drive a brushless motor with DRV8301. But the datasheet of DRV8301 doesn't show the diodes. What is their purpose?

What other protective mesures should I take? Or should I?

Thanks,

Roman

  • 0
    TI__Guru** 114905 points
    Hi Roman,

    Can you tell me where you found the top schematic? This may provide some context.
  • 0 in reply to Rick Duncan
    Intellectual 440 points

    It is a BLDC ESC. It uses STM32F103 with DRV8301 to drive a motor from 4S lipo battery.

    I built my ESC on Piccolo MCU and DRV8305. I used examples from TI datasheets. But I found several examples where some kind of protection is implemented. I do not know what is necessary as I do not have big experience. May be someone can suggest some methods.

    Best regards,

    Roman

  • 0 in reply to Roman Simonyan
    TI__Expert 4650 points
    Hi Roman,

    The discrete components included in the top schematic you linked are uneeded for the DRV8305.

    In section 7.3.8.3.2 (Page 27) of the DRV8305 datasheet outlines the different integrated gate driver protection features that are included in the device. Over voltage protection is one of the features, meaning the diodes on the MOSFET gates are uneeded.

    The DRV8305 also includes a hard pull down on the MOSFET gates called "TDRIVE". This integrated pull down means the external pulldown resistor is not needed.

    Finally the DRV8305 has a feature called "IDRIVE", which is a scalable source / sink MOSFET gate drive current setting. Using this feature there is not a need for an external series current limiting resistor.
  • 0 in reply to Phil Beard
    Intellectual 440 points

    Thanks Phil. Great news.