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DCAP control versus constant on time (COT) control

Xiaoying Lu
Expert 4240 points

Hi,

I am a FAE NCG and am learning dc/dc control mode recently.

Could you please help explain the advantages of DCAP control compared with COT control?

Some notes show that in DCAP, the converter switching frequency is compared to a reference clock frequency, while the on-time adjusts to maintain a switching frequency within a relatively narrow variation range. And for COT control, the converter generates a proper on-time based on the input and output voltage. But based on the statement, seems that the results are similar in steady state, especially when Vout and Vin are stable. Could you please help explain that or recommend some more detailed technical paper/note for me to learn? Thanks.

  • 0
    TI__Expert 5470 points

    Hi Xiaoying,

    D-CAP is a TI's controller architecture to implement COT control. COT is a control method about basic principle. D-CAP is not only a control method but also the controller architecture to implement the control method. For example, the D-CAP2 control architecture includes the integrated ripple injection circuit inside controller. 

    Application note:

    Regards,

    Andrew