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In many applicaTIons, a DC/DC Converter is used toproduce a regulated voltage or current, derived from anunregulated power supply, or from a battery. Examplesof these applicaTIons include battery chargers, electronicair purifiers, emergency exit signs, and distributedpower systems.In some of those applicaTIons, a dedicated SwitchedMode Power Supply (SMPS) Controller IC is used inconjuncTIon with a microcontroller. In other applications,however, a dedicated SMPS Controller IC may beoverkill. An alternative approach is to generate a lowcost SMPS function in a smart microcontroller, such asthe PIC16C620A. This Application Note shows amethod of using the microcontroller to perform simpleSMPS control functions.Two circuits were built for evaluation. One circuit providesa Constant Voltage output, the other a Constant Current output.
