Precise Constant Current Generation with DC/DC Converters
MagI³C Power Modules from Würth Elektronik are DC/DC converters with integrated controller IC, inductors and capacitors. Using the “MagI³C Power Supply Reference Design”, the manufacturer now demonstrates the ease with which an adjustable current or voltage source can be built with a MagI³C Power Module. 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 15 V and the current from 0 to 2.5 A. The input voltage range is 7 to 36 V. 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.
The reference design can be used as a driver for white, infrared and ultraviolet power LEDs or as a battery charger for lead, NiCd, NiMH or lithium-ion batteries. It can be used as super cap charger and mini lab power supply.
The board can be ordered immediately under article number 178002. The documentation DNS002 for the reference design and the CAD data are available online in the product catalog (Reference Designs).
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