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LM5085: Dynamically control output

na na78
Guru 16770 points
Part Number: LM5085

Hi

I have question for the following blog.

How to dynamically control the output voltage with a COT regulator
Constant-On-Time (COT) regulators provide a simple , cost-effective way of implementing step-down buck regulators with nearly fixed frequency. COT regulators do not require loop compensation and provide…
By in Technical articles > Power management

In the blog, the value of Rf is set as 10Kohm.

Is this value of resistance impacted for the efficiency?

For example, if Rf is too small what impact is considered?  Or it doesn't matter?

BestRegards

  • 0
    TI__Mastermind 40040 points
    The Value of Rf will impact how much Vout will adjust for a given change in the DAC voltage. In effect, Rf effects the gain of the Vout adjustment as a result of voltage change on the DAC. It will have no tangible effect on the efficiency.

    Hope this helps?

    David.