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TMS320F28P659DK-Q1: Digital control for DC-DC power supply

Unnimaya V
Prodigy 240 points
Part Number: TMS320F28P659DK-Q1
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hi Expert,

We are currently developing a digitally controlled 2kW DC-DC power supply utilizing Phase-Shifted Full-Bridge (PSFB) topology with Peak Current Mode Control (PCMC). I seek clarification on the following points:

1. How is the reference voltage (Vref) generated? Can it be generated internally, or does the controller provide it?
2. Is digital slope compensation feasible with the TMS320F28P659DK-Q1?
3. Are there any software tools available that support digital control design?
4. Is it possible to incorporate digital signal conditioning within the controller?

Thanks and Regards
Unnimaya V V

  • 0
    TI__Genius 11835 points

    How is the reference voltage (Vref) generated? Can it be generated internally, or does the controller provide it?

    There is no ref volt signal as is normally used in analog control. In this case (digital control) reference volt is represented by a value using a variable in software. This value represents the per unit or percentage of the full scale sensing voltage of the same signal that you are trying to control. Pls see our reference design in C2000 DP SDK. You have to download C2000Ware to see these ref designs


    2. Is digital slope compensation feasible with the TMS320F28P659DK-Q1? Yes, this is done by a ramp signal internal to the MCU. Again see our ref design that uses this feature


    3. Are there any software tools available that support digital control design? Yes, download C2000Ware
    4. Is it possible to incorporate digital signal conditioning within the controller? You apply digital filter on the sensed digital signals. But any signal you sense, you will need some external RC filter or signal conditioning circuits Again see the documentation associated with our ref designs