• State Resolved
  • +1 person also asked this people also asked this
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 821 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MCF8316A: Adding external power mosfets to integrated gate driver motor control IC

Ryan Sheehan
Prodigy 150 points
Part Number: MCF8316A
Other Parts Discussed in Thread: MCT8316A,

Hello,

I have an interest in the MCF8316A and the MCT8316A for a potential BLDC motor control application, but this may require higher power than achievable with these ICs. I read in this article (https://e2e.ti.com/blogs_/b/analogwire/posts/code-free-motor-drivers-streamline-bldc-motor-design), at the end of paragraph 2 of "Method No 3" :

"For motor applications that use less than 70 W, such as vacuum robots, residential ceiling fans or pumps used in washing machines, you can choose devices with integrated MOSFETs to further reduce board space. The MCF8316A and MCT8316A devices support up to 8-A peak current for 24-V applications. For high-power applications, you can place power MOSFETs on the board with the gate driver and motor control integrated into one chip."

The last sentence makes it sound like I could add power mosfets with a higher current rating external to either of the two previously mentioned ICs for a higher power application. Is this correct? If so is there any reference documentation on this or an application note?

Thank you,

Ryan

  • +1
    TI__Expert 5578 points

    Hi Ryan,

    Thank you for your question on the motor drives E2E forum. 

    The line in the article you are citing refers to a solution that only includes integrated control and gate driver (the green and blue sections seen below). MC(T/F)8316A has the full motor driver architecture shown below (green + blue + purple) and adding an additional power stage (purple section) will not result in a higher current or power rating.

    If the specs of MC(T/F)8316A do not meet your project requirements, you may want to consider a different gate driver solution that has external control and power stage (blue section only).  

    For help with device selection please use our BLDC selection guide document (https://www.ti.com/lit/SLVAES1) and our Brushless DC (BLDC) motor drivers page on TI.com (https://www.ti.com/motor-drivers/brushless-dc-bldc-drivers/overview.html).

    If all of your questions have been addressed and answered please help mark this thread as resolved.

    Best Regards,

    Robert

  • 0 in reply to Robert Wedan
    TI__Genius 16700 points

    Just to add to Robert's comment, external MOSFET's would not work to a device that has them integrated for lack of a charge pump circuit to drive the gate of the top MOSFET above the bus voltage. 

    Our C2000 line of microcontrollers offer several reference designs that drive high power motors using motor driver controllers (external MOSFET's). Here is one reference design to serve as an example: https://www.ti.com/lit/SPRACB8 

  • 0 in reply to Lenio Cacula
    Prodigy 150 points

    Hi Robert and Lenio,

    Thank you both for your replies. This is about what I was expecting but wanted to verify. 

    Best,

    Ryan