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DP Lib CNTL 2P2Z output < 0?

TobyM
Genius 5200 points

Looking at the documentation for the f2802x DPLib it seems that the output of the CNTL 2P2Z macro cannot go negative... is this correct? Even with negative smin values?

Thanks

  • 0
    Genius 5200 points

    Seems like this is actually an error in the documentation (p. 21 & p. 26) as where it specifies [0, 1) for the output pointers, it should in fact specify something along the lines of (-1, 1).

  • 0 in reply to TobyM
    TI__Mastermind 43730 points

    Toby,

    You are correct, it does work for negative numbers. However typically in digital power we never want the output to be a negative number at least for DC-DC,

    what kind of application is yours?

    The reason why this is documented this was is because of test coverage before releasing the module, 

    Regards

    Manish Bhardwaj 

  • 0 in reply to Manish Bhardwaj
    Genius 5200 points

    Hi Manish

    I guess this is the case if the output of the CNTL macro is to be directed directly to a PWM duty register for example as one could not have a negative duty cycle! However, for our application we have a source that is both voltage and current controlled, the output of the voltage CNTL feeds into the ref input of the current CNTL macro, which only then outputs a duty value.

  • 0 in reply to TobyM
    TI__Mastermind 43730 points

    Toby, 

    Thanks for the info, I have filed this an an enhancement to the test routine after which we will document it that way.

    Regards

    Manish Bhardwaj