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LM5010A-Q1: Regarding Article about how to dynamically control the output voltage with a COT regulator

Jonathan Geronga
Expert 7930 points
Part Number: LM5010A-Q1

Hi Team,

We have a customer that go through this article:

The customer would like to ask the following regarding the article above:

- Can this method also be applied to the LM5010A-Q?
- Is this method only suitable for small voltage adjustments or also for controlling an output voltage between 12V - 28V?

Please let me know if you have a question to ask with the customer.

Thanks,

Jonathan

  • 0
    TI__Mastermind 30430 points

    Hello Jonathan,

    Have some experience doing this with current mode, but not so much for constant on-time regulator.

    Allow me to do some research and get the model.

    Can you email customer specification and I can work on the analysis in the meantime?

  • 0 in reply to Marshall_Beck
    Prodigy 100 points

    Hi Marshall,

    I am Christian, Hardware Development Engineer at Vector Informatik GmbH in Germany and I asked this question about the article.

    First, thank you for your quick response.

    Our main specifications are an input voltage range of 8V - 32V, with a typical input voltage of 27V and the maximum output current is 1A.

    The regulator should supply a motor driver with either 12V or 27V (or a bit less). The accuracy of the output voltage is not that crucial (e.g. +-1V).

    Regarding the article, I got the impression that COT regulators are more suitable for this method than other regulators. It's very interesting to read that you have experience doing this with current mode regulators as well. In our case, the control mode is not specified. I chose the LM5010A-Q1 because it has the same control mode as the regulator in the article. If there is a regulator which is more suitable for this case, plesae let me know. But the regulator has to be AECQ quailifed and less external components are preferred.

    Thank you very much in advance and I am looking forward to your answer.

    Best regards

    Christian

  • 0 in reply to Christian Edhofer
    TI__Mastermind 30430 points

    Hello Christian,

    Either device will fulfill your needs. Current mode operates in same fashion: http://www.tij.co.jp/jp/lit/an/slva861/slva861.pdf

    Dynamic output can be controlled by current DAC or PWM filtered source from MCU.

    I believe LMR3310 might be better positioned to fulfill your needs of smaller size and componet count. Comes in small, hotrod package, as well.

    If you would like to have more integrated solution, same silicon is put into power module.

    LMZM33602

  • 0 in reply to Marshall_Beck
    Prodigy 100 points

    Hello Marshall,

    Thank you for your answer.

    This application note SLV861 also describes only a small adjustment of the output voltage.

    My question is, if these methods can be used for an adjustment from 12V to 27V?

    If yes, how do I design the external components like the inductor and output capcitors?

    Have you already had a look at the model of the LM5010A-Q, as you wrote in your first answer?


    Thank you,

    Christian

  • 0 in reply to Christian Edhofer
    TI__Mastermind 30430 points

    Yes. Big adjustment can be achieved.

    Can you have local sales support to connect with me over email?

    File sharing may be difficult over forum.

  • 0 in reply to Marshall_Beck
    Prodigy 100 points

    Okay, thank you.

    In the meantime, I ran some simulations with the LMR36015FSC-Q1 using the TI Webench Power Designer. Of course, I could not simulate the output voltage control with a DAC but I think it is a good point to start.

    For Vout = 12V and Vout = 26V, I used the same L and Couts and the simulations showed a proper performance for both output voltages.

    What exactly do I have to do to connect with you over email?

    Best regards

    Christian

  • 0 in reply to Christian Edhofer
    TI__Mastermind 30430 points

    Yes,

    I have done quite a few designs with that device.

    Email: m-beck1@ti.com