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TMS320F280049: Bi Directional DC/DC PCMC Slope Compensation?

Trey German8
Expert 1930 points
Part Number: TMS320F280049
Other Parts Discussed in Thread: TIDM-DC-DC-BUCK, TIDM-02000

Systems Team,

I've got a prototype design similar to the DC/DC boosterpack but ultimately I'm trying to use the power stage as both a buck and boost depending on power stored in an external device.  To measure current in both operating modes with the same sense element I've biased the inductor current feedback around 1.65V.  Am I correct in thinking that the built in ramp generator won't work or would only work for inductor currents above the 1.65V midpoint?  Is the solution to implement the slope compensation using the CLA as described in SPRABE7A?  Or is there another clever way to do this using the hardware that I'm not thinking of?

Thanks for your time,

Trey

  • 0
    TI__Genius 15685 points

    Hi Trey,

    Sorry for the late reply. The ramp generator should work as long as the current feedback signal is within the 3.3 V range. You can set the proper offset(does not have to be 1.65V) based on your specific application. For PCMC and slope compensation, you can refer to TIDM-DC-DC-BUCK or TIDM-02000 which are based on f28004x device. There is no big difference for slope compensation in cla and c28.

    Regards,

    Chen