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DRV8300-Q1：DRV8300DRGE ISSUE

David Huang
Prodigy 40 points
Part Number: DRV8300-Q1
Other Parts Discussed in Thread: DRV8300

Tool/software:

SINGLE ESC GATE DRIVER.pdf

Hello:


Design Requirements:
1. Input Power: 12S Lithium Battery, approximately 40V-51V
2. Driving a BLDC Motor (output continuous current 60A, instantaneous maximum current 100A)

The design circuit is attached. I have the following questions:
1. Can the DRV8300DRGE gate pin drive three MOSFETs (TPH4R50ANH1) simultaneously?
2. Is the damping resistor connected in series with the gate pin still 10 ohms?
3. Is the gate drive voltage still designed to be 10V, or does it need to be increased?
4. Does DT need to be adjusted to drive multiple MOSFETs at once? Are there any recommended values ​​or calculation formulas I can use? Design Requirements:
5. My design circuit diagram is attached. Could you provide some design advice?

Thank you!

  • 0
    TI__Expert 4695 points

    Hello,

    1. Yes, the DRV8300 should be able to drive 3 MOSFETs simultaneously. The device does however have protections to prevent INHx and INLx of the same phase being turned on a the same time.

    2. You can change the value of the external gate resistor in order to limit drive current to the MOSFET and allow more configurability in your circuit. 10ohm is reasonable value.

    3. The GVDD is usually 10-12V. This does not need to be increased

    4. The main thing to consider when you are driving multiple MOSFETs in parallel is making sure that the device is able to supply enough drive current to turn on all 3 MOSFETs. (Look at the Qgd and Qtotal of your MOSFETs)

    5. I reviewed the schematic. It looks good. Again, just make sure your MOSFET Qg total values are not too high for the driver to supply, since you will have 3 of them at one time. This driver can source 750mA so it should be able to handle as long as your MOSFETs are not huge. you may even need to manipulate the gate resistor to limit the current if it is too much.

    Thanks,

    Joseph