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Original question:

DRV8329AEVM: DRV8329

DRV8329AEVM: DRV8312

turguy goker
Prodigy 220 points
Part Number: DRV8329AEVM
Other Parts Discussed in Thread: DRV8312, MCT8316Z

Tool/software:

I have a slightly different application question regarding the use of a BLDC motor in a space-constrained environment. The application operates at 48VDC with Hall sensor feedback, requiring SPI interface and a single PWM control signal. The average operating DC current is 1.5A, and I am considering the DRV8312, which has a peak current rating of 6.5A.

However, due to the compact footprint of this chip, I am concerned about its performance in low-airflow environments. Specifically, if the motor becomes locked with a 48VDC supply and a motor resistance of 20 ohms, resulting in a 2.4A DC current in a locked-rotor condition, and the ambient temperature reaches 40°C, will the chip be able to withstand these conditions? Or is the DRV8312 unsuitable for such harsh environments, where high ambient temperatures and reliability are critical?

  • 0
    TI__Mastermind 19886 points

    Hey Turguy,

    With Mosfets being integrated into the package the heating during operation would be larger than our gate drivers with external MOSFETs due to current flowing through the RDS on of the Fets. Our DS mentions the operating temperature range of our drivers along with recommended ambient temp range, so you will have to test to see if the driver might hit the OTW and OTshutdown temperature in your system.

    It is hard to make prediction on how much heating will occur as it depends heavily on PCB construction.

    Few resources I recommend checking out:

    1) https://www.ti.com/video/6313302480112

    2) https://www.ti.com/lit/an/spra953d/spra953d.pdf

    What is the application, volume and timeline for this project? We have some new drivers in the pipeline that might be good to consider.

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 220 points

    thanks please stay tune for my reply. We have a robotic application that is industrial application where ambient temp is max 40C and internal temps due to self heating can reach to 45C. Due to space requirements for a specific BLDC we need to consider integrated device. I am thinking using MCT8316Z Sensored Trapezoidal Integrated FET BLDC Motor Driver with 24 VDC supply and operating current max wth locked rotor is 1.5 Amps. I like to know is this can currently meet my application if rotor is locked at max temp for prolonged periods without damaging the IC. I am also interested in knowing your pipe line. Note i am thinking 8316Z because its voltage and 8 Amp current. But given package of IC same as other integrated devices how the max 8 Amp is achieved this is also a question.

  • 0 in reply to turguy goker
    TI__Mastermind 22991 points

    Hi Turguy, 

    Thanks for the follow up, we will aim to provide a response next week. 

    Regards,

    Anthony Lodi

  • 0 in reply to Anthony Lodi
    TI__Genius 16230 points

    Hi Turguy,

    Using our BLDC Thermal Calculator, assuming the ambient temp around the MCT8316Z is 45C, a small PCB, and minimal losses from the buck, the MCT8316Z should not have any issues with your application even if the rotor locks for extended periods. 

    turguy goker said:
    given package of IC same as other integrated devices how the max 8 Amp is achieved

    The design of the internal MOSFETs determine the max current that can be supported without the MOSFETs destroying themselves. Differences in current support by similar package devices is mostly due to a difference in the internal MOSFET design.

    I have sent you an email to further discuss the pipeline products.

    Regards,

    Joshua