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Difference between Error Amplifier and Loop comparator in Buck

GARAM AN
Intellectual 1950 points

Hello,

In the feedback part of the buck converter, voltage mode and current mode uses "error amplifier" to compare between Vfb and Vref.

And COT(Constant on time) and AOT(Adaptive on time) uses just "loop comparator" instead of error amplifier to compare between Vfb and Vref.

I think the purpose of "loop comparator" and "error amplifier" is same that they are comparing Vfb and Vref.

1. What is the difference between error amplifier and loop comparator?

COT control has faster load transient performance than VMC or CMC, because there is no delay in the comparator.

2. Why the loop comparator in the COT does not have delay?

Thank you

  • 0
    TI__Mastermind 27045 points

    Hi Garam,

    1. What is the difference between error amplifier and loop comparator?

    ---------Error amplifier works as precision amplifier with linear voltage or current output, the loop comparator works as voltage comparator with high/low output,   

    2. Why the loop comparator in the COT does not have delay?

    ----------loop comparator has no integration  on the input difference between Vref and Vout, so there is no delay in control loop