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Selection of TM4C microcontroller based for required switching frequency.

anupsingh chandel
Expert 1385 points
Other Parts Discussed in Thread: UC3853

Dear All,

I have a basic doubt regarding selection of microcontroller. I have a system which needs 4 PWM channels at the rate of 150kHz. Added to that 4 current sensing and PI control. So what things I need to consider while choosing the appropriate TM4C device.

Does this requirement have relation with clock frequency selection, timers etc. Please guide.

Thanks.

Regards,

Anup.

  • 0
    Guru 117855 points

    Would not your (brief) review of vendor's, "MCU Selection Guide" prove worthwhile?

    To locate it - the bright red-stripe across the top of this forum page (may potentially) serve - but not here - nor now. (highly sought/useful: "Blogs & Groups" serve (some) purpose but FAIL all posters in the "direct & efficient" search of most necessary MCU tech info!)

    Vendor's current "method" (seemingly to: bury, hide, obscure) vital tech data must make sense - but few (perhaps none) here can comprehend...

  • 0
    TI__Guru**** 244380 points
    Hello Anup,

    What is the type of PI implementation that you plan to have and what is the time it takes to run an input through it and get the output. The current sense via ADC and PWM are kind of autonomous, so the processor overhead on them would be limited to reading the data or changing the DC or Period. It is the PI computation that you need to see, as to how much time do you plan between updates.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Expert 1385 points

    Hello Amit,

    Thank you for your suggestions. So I studied my hardware. I am designing a DC/DC converter (SEPIC) with 100kHz switching frequency. We are operating 4 converters in parallel/interleaved for current sharing. so I will be needing 4 PWM signels. It is going to be a 2kW system.

    What I seen on threads peaople tend to use C2000 series and CONTROL SUIT  for this kind of application. Is there any perticular reason for that. Please suggest.

    Can we use TM4C123/129 for the same application keeping in mind future expansion/development. As it is a very initial phase for me I need to test the system using analog (UC3853) and digital (after finalising the controller) way.

    Please help.

    Thank you.

    Regards,

    Anup.

  • 0 in reply to anupsingh chandel
    TI__Guru**** 244380 points
    Hello Anup,

    As far as I know, C2000 series and Control Suite have dedicated support for DC/DC converter application. Since an equivalent support is not there on TM4C, it would be an uphill task developing one as of this moment. I would suggest considering C2000 device as a better alternative since application note, TI designs and collateral would be available.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Expert 1385 points
    Thank you Amit.

    Regards,
    Anup.