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TPS62130: About DCS-Control

user4811888
Intellectual 530 points
Part Number: TPS62130

Hi TI expert,

What is the difference between TI DCS-control and TI D-CAP control?

As you know, D-CAP control actually is basic constant on-time control with adaptive on-timer, also named "ACOT" in some paper or materials.

In this DCS-Control diagram, there's an extra ramp as ripple injection generated by VOS, compared with traditional COT(D-CAP in TI).

However, take below RC network across L as example, it is well known ripple(ramp) injection in COT can improve noise margin and PWM jitter performance, and the most important, can avoid sub-harmonic oscillation stability issue of low ESR output capacitor.

Refer to this App note: D-CAP with ripple injection

So In my view, DCS-control seems no difference from various of traditional COT in paper. What I only noticed is, the injected ramp generation source, coming from VOS-FB, top side resistor divider in parallel with a capacitor. Does it cause "DCS" naming?

  • 0
    TI__Genius 14455 points

    Hi 

        DCS (Direct Control with Seamless switching to Power Save mode) is a form of COT architecture.  There are slight differences in their implementation though as you can see that DCAP architectures, the FB pin directly feeds into the comparator. In DCS, the FB pin feeds into an error amplifier and then to the comparator.

    What is the problem that you are trying to solve?

    Regards,

    Gerold

  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    Intellectual 530 points

    Thanks for your reminding that FB connects to EA instead of comparator, and letting me the full name of DCS. It is then looking like V2COT with a voltage outer loop EA, to improve output accuracy.

    I'm just learning and summarizing TI control architectures, for better application understandings presently.

    I will come back again if I meet with a specific application issue, thanks again.