Precise constant current generation with dc-dc converters

WURTH ELEKTRONIK MagI³C Power Modules are dc-dc converters with integrated controller IC, inductors and capacitors. The board is based on the MagI³C VDRM (Variable Step Down Regulator Module) to which two additional control loops have been added. The design is aimed at various applications that require an adjustable power source: The reference design generates a constant voltage with an adjustable maximum current on the one hand, or can be set to generate a constant current with adjustable maximum voltage on the other. In the two operating modes, the output voltage can be set from 0 to 15V and the current from 0 to 2.5A. The input voltage range is 7 to 36V. LEDs on the board indicate the voltage regulation mode, current regulation mode and a missing output voltage. The output voltage and output current are conveniently set on two potentiometers.