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LTC4125: How to suppress the rise of FB terminal voltage after Optimum Power Search

Category: Hardware
Product Number: LTC4125

I want to minimize the rise of the FB terminal that occurs after Optimum Power Search. What is the method?

The attached figure is a figure of the manual of DC2330A Demo Board.

The part surrounded by the red frame is the rise in FB voltage.

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  • Hi Dachin, 

    The high FB rise is normal and it is designed to be like that so it is easy for LTC4125 to hit the exit condition of the optimum power search. However, if you would like to lower the FB rise, you can reduce the rated voltage for the zener diode (D4, on page 14 of the DC2330A demo manual) in the presence detect circuit. 

    Thanks,

    Wenwei. 

Reply
  • Hi Dachin, 

    The high FB rise is normal and it is designed to be like that so it is easy for LTC4125 to hit the exit condition of the optimum power search. However, if you would like to lower the FB rise, you can reduce the rated voltage for the zener diode (D4, on page 14 of the DC2330A demo manual) in the presence detect circuit. 

    Thanks,

    Wenwei. 

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