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Calibrate power supply with digital potentiometer

Posted: 06 Nov 2012 ?? ?Print Version ?Bookmark and Share

Keywords:power supply? potentiometer? automatic calibration?

A resistive feedback network is often utilised to set the output voltage of a power supply. A mechanical potentiometer (pot) conveniently solves the problem of adjusting a power supply. For easier automatic calibration, a mechanical pot can be replaced with a digital pot. This application note presents a calibration solution that uses a digital pot, because digipots are smaller, do not move with age or vibration, and can be recalibrated remotely. This proposed solution reduces the susceptibility of the system to the tolerance of the digital pot's end-to-end resistance, making the solution optimal for designers. This application note also explains some of the equations required to calculate the resistor chain values and to use a digital pot in this way. A spreadsheet with standard resistor values is available for easy calculations.

View the PDF document for more information.

Originally published by Maxim Integrated at as "Calibrating a Power Supply with a Digital Potentiometer".

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