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Original question:

TMS320F28379D: TMS320F28379D

TMS320F28379D: TMS320F28379D

robin gangopadhya18
Mastermind 6326 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: TIDM-1001

In SLUA733, Dr. Leisten seems to show that the best operation occurs at or below resonance frequency of the LLC.

Am I concluding this correctly?

My concern comes from the fact that forever, LLC has been controlled in a way that avoids the "capacitive" mode of the resonance. I.E., switching freq going below freq of resonance.

There used to be algorithms in the MCU to detect & prevent switching freq going below a certain gain range.

Is that not true anymore?

Then does the algorithm in Delfino Interleaved  LLC run within the range indicated in SLUA733 design guide? 

-appreciate any clarification of this situation.

robin

  • 0
    TI__Mastermind 43730 points

    1. We don't have an implementation of algroithm that auto detect which mode the LLC is working in, there are several challenges with this type of detection. Typically a greater than series resonant frequency operation is preferred. 

    2. On the TIDM-1001 we used a fixed range, whether the range was calculated using SLUA733 I am not sure, some basic simulation may have been carried out to verify the range and basic software clamps put in the software to ensure operation only during this region (this is common for most LLCs), 

    3. We do have reference design whcih can work below, at and above resonance. Typically this is guaranteed by carefull power limitation on the converter and margin analysis for variation in process of building the converter.

    http://www.ti.com/tool/TIDM-02002