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AD5141 in feedback loop of buck regulator

Hello,

We intend to use a AD5141 in the feedback loop of a buck regulator, for example as RFB2 with an ADP2300. Can this be considered a 'common use' of the AD5141 or do we have to expect problems compared to using a standard resistor?

many thanks and kind regards, Felix

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  • Hi Felix,

    Happy New Year!

    Yes you can use the AD5141 as a feedback resistor in a regulator.

    But there are few things to consider before using in this application.

    1. The output voltage of the regulator should be less than the maximum allowable voltage at the terminal of the digipot. In this case if the output voltage is 28V in the regulator, AD5141 cannot be used as the maximum voltage at the terminal is +7V.
    2. The current flowing through the Digipot should be less than the maximum allowable limit mentioned in the datasheet.
    3. Consider the the resistor tolerance which will affect the accuracy of the output of the regulator. Also, consider the wiper Capacitance which might impact the stability of the output of the regulator. 

    Regards,

    Koushik

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  • Hi Felix,

    Happy New Year!

    Yes you can use the AD5141 as a feedback resistor in a regulator.

    But there are few things to consider before using in this application.

    1. The output voltage of the regulator should be less than the maximum allowable voltage at the terminal of the digipot. In this case if the output voltage is 28V in the regulator, AD5141 cannot be used as the maximum voltage at the terminal is +7V.
    2. The current flowing through the Digipot should be less than the maximum allowable limit mentioned in the datasheet.
    3. Consider the the resistor tolerance which will affect the accuracy of the output of the regulator. Also, consider the wiper Capacitance which might impact the stability of the output of the regulator. 

    Regards,

    Koushik

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