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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
Other Parts Discussed in Post: COT 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…
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 40120 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.