• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 484 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.

LMD18200 working with 48V Supply

Kevin Wen
Intellectual 2235 points
Other Parts Discussed in Thread: LMD18200, DRV8412

Hi team,

My customer Neusoft is working on a new project to driver a 48V 3A DC motor, they have used LMD18200 before, so they wish to continue to use it. But in their old project the VM voltage is 24V and in the new project the supply voltage will be 48V, so customer wish to know if it is still safe to use LMD18200 and is there anything on the power supply, PCB layout or extra protection circuit that they should pay attention to?

Kevin Wen

  • 0
    TI__Mastermind 26065 points

    Hi Kevin

    I would say there are more things related to the VM pumping issue. Customer need to have good control with proper decelerating and stop control to avoid motor's regenerating. The following blog give some explaination on the VM pumping issue.

    http://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2013/10/18/the-art-of-stopping-a-motor.aspx

    To the PCB design, a local bulk capacitor (usually >100u) + 0.1u~1u ceramic caps should be placed close to the VM and GND pins. The high current tracks should be kept away from the signal traces. A good GND plane will help to lower the noise or issue related to grounding impedance. 

    Although customer may not want to change, DRV8412 will be a good one similar to this LMD device, with lower RDson and a SMT package, higher current margin. Just in case customer want to have a upgrade of the their system :)

    Best regards,