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DRV8302: 3-Phase BLDC Pre-Driver for 48 V board voltage

jgerhardy
Intellectual 485 points
Part Number: DRV8302

Hello Motor Driver Experts,

were are looking for 3 Ph. BLDC pre-Drivers for new development in a 48 V Environment.

Are the DRV830x Drivers appropiate for a 48 V supply? I feel a Little uncertain because the 
DRV830x datasheets give an absolute max supply voltage of 65 V and a supply voltage of
up to  60 V. We generally use a 1.5 factor in our applications as a general rule between maximul 
voltage and nominal voltage which would be 72 V for a 48 V supply which is more than the
absolute max. rating of the the DRV830x's. Are there any concerns here?

Regards,

John

  • 0
    TI__Genius 14485 points
    Hi John,

    So long as you plan to operate the device at 48 V, there isn't a problem, but the upper recommended limit for supply voltage is fixed at 60 V.

    Regarding your 72-V requirement, I think we need to consider the risk of that condition actually happening, and decide if the 1.5x factor of safety is reasonable for your system. How likely is it that a DRV830x would operate at a voltage greater than 60 V in your design? Would it be continuous operation or a transient of 72 V on a 48 V supply? If you have 72-V transients, there might be ways you could suppress those transients to 60-V in your design. If it is continuous operation, they you may need to use some kind of power supply circuitry to regulate 72 V to 48 V.
  • 0 in reply to James Lockridge19
    Intellectual 485 points
    Hello James,

    I see your point, which is well taken. As our customer is in automotive, there is a lot of fluctuation in the supply voltage as you may know and our customes require the 1.5 factor for the supply ranges. However, for this project I have not yet received any specifics for the desired supply range at 48 V Nominal. Does TI have any references or future plans for 48 V nominal in automibile? At the Moment, we are in the early development stage and I am looking for a compatable pre-Driver that I can start with. Is this something you can recommend?

    Regards,
    John
  • 0 in reply to jgerhardy
    TI__Genius 14485 points
    John,

    Thanks for your feedback. Now that you say it's for automotive, I understand the reason for the requirement. I will recommend this device to our systems team for a possible next generation IC.

    If you're looking for something to use for early development/proof of concept, I think any of our 60-V DRV83xx devices should be sufficient. Any future devices we might develop for higher voltages will have similar features and interface.

    Please check back on our forum or TI.com closer to the time you need the 72-V device to see if we offer one.

    Are you supported by any of our field sales reps or apps engineers? They can also help to keep you updated on product releases.
  • 0 in reply to James Lockridge19
    Intellectual 485 points
    Hello James,

    okay, thanks for the Information.

    Regards,
    John