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DRV8353: Is 100V really the maximum voltage?

Part Number: DRV8353
Other Parts Discussed in Thread: DRV8323,

Hey forum,

We're looking at making our power stage for a BLDC motor more robust by switching from the DRV8323 to the DRV8353, but I've got a couple questions that we're clear to me from studying the datasheets.

1) Can the DRV8353 be operated from 100V on all the input pins, I see in the datasheet the max Vm pin voltage is 80V?

2) Other than the slight differences in pinning, is the SPI configuration, and general operation, of this device identical to the DRV8323 (if so we don't need to overhaul our firmware).

Thanks for your help!

Josh

  • Josh,

    The 100V mentioned in the datasheet title is the VDRAIN voltage which the output FETs use to drive the load. The VM pin does have a max recommended voltage of 75V. That being said, the VM pin only needs 9V or higher, it's not the output power supply, VDRAIN is.

    As an example, some of our customers use the internal Buck regulator to create a 12V source for VM from the VDRAIN voltage. The datasheet discusses this in section 9.2.2.

    Regards,

    -Adam
  • Awesome, makes a lot of sense, thanks again Adam