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UCC2626: Setting the PWM-I, C-TACH, and PI network

Taufik Taufik
Prodigy 10 points
Part Number: UCC2626

Hello,

For the UCC2626DW, I have the following questions:

1. Which level of voltage level should we aim for as the input to the PWM-I pin? Do we target 5V (mid-way between 2.5V and 7.5V) at the rated speed of the motor to give the 50% duty cycle at rated speed?

2. In equation (3) of the datasheet, does V represent the rated RPM speed of the motor?

3. In Figure 17 of the datasheet, is there an example or application notes that show how to select the components (C7, C8, and R10) of the PI opamp network that connects into the PWM-I pin?

Thank you very much for your help.

Taufik

  • 0
    TI__Mastermind 26476 points

    Hi Taufik,

    Thank you for posting your question on the motor drives forum! Let me look into this in more detail and aim to get back to you by the end of the week. The UCC2626 is an old device so we have limited support available for it, but I will see what I can do. If you are interested, I could also help you look into alternate parts in our portfolio that may meet your needs.

    Regards,

    Anthony Lodi

  • 0
    TI__Mastermind 26476 points

    Hi Taufik,

    For question 2, the V represents the actual RPM speed of the motor. This means that as the RPM speed of the motor changes during operation, the frequency of the TACHOUT will change proportionally. 

    I will need some more time to look into questions 1 and 3, I will aim to provide an update on those by the end of next week.

    Regards,

    Anthony Lodi

  • 0 in reply to Anthony Lodi
    Prodigy 10 points

    Hi Anthony,

    Thanks for helping me on this. Any chance you've found the answers to my questions #1 and #3? For #3, if there is any application note or documentation that you can share with me on this subject that will be great.

    Thanks,

    Taufik

  • 0 in reply to Taufik Taufik
    TI__Mastermind 26476 points

    Hi Taufik,

    My apologies for my delayed response, I haven't yet found answers for questions #1 and #3, but I haven't dug too deeply into it yet. Unfortunately we do not have any application notes for #3 that I am aware of, but I will let you know if I find anything. This device is quite old and we have limited collateral for it. I will try to prioritize getting a response to you at least on #1 by the end of the week. 

    Regards,

    Anthony Lodi

  • 0 in reply to Taufik Taufik
    TI__Mastermind 26476 points

    Hi Taufik,

    I am struggling to find an answer for questions 1 and 3, but I was able to find this app note (https://www.ti.com/lit/an/slva662/slva662.pdf) that covers type 2 compensators that might be of some help. Unfortunately I don’t think we have any app note specific for the UCC2626 for selecting those components.

    I will spend a little more time looking into question 1 to see if I can find an answer.

    Regards,

    Anthony

  • 0 in reply to Anthony Lodi
    Prodigy 10 points

    Thank you again for your help. Likewise, I've also been struggling to find more information about this part. The app note does help, and I used a similar one, but I am not sure if it is applicable for motor drives. Please let me know if you could provide any further info on #1 and #3.

    Related to this. What would you suggest I should look into if I were to use a newer alternative part to UCC2626?

    Best,

    Taufik

  • 0 in reply to Taufik Taufik
    TI__Mastermind 26476 points

    Hi Taufik,

    I will let you know if I can find any additional info on #1 and #3. 

    If you would like to let me know your key requirements for your system I can recommend alternative part/s for your needs. I have attached a questionnaire that you could fill out to help me understand what are the key considerations for your system. Feel free to add additional details that are important for you.

    Regards,

    Anthony Lodi

    Information to Help Select the Correct Motor Driver.docx