Microchip Technology

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  • dsPIC33EP64GS502 Digital DC/DC Converter

  • Created: Dec 28, 2016

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New and high-end power supplies are becoming more efficient and flexible considering their small sizes and compact designs. These desirable enhancements have come about as Digital Signal Controllers (DSCs) are incorporated into Switch Mode Power Supply (SMPS) designs. The board provided in the kit is intended to introduce and demonstrate the capabilities and features of Microchip SMPS families of devices. The digital power starter kit is a Switch Mode Power Supply (SMPS) board that consists of one independent DC/DC synchronous buck converter and one independent DC/DC Boost converter.

The digital power starter kit is powered by a 9V supply through the power connector J2. It is designed to be a self-operating power supply with each converter having three on-board resistive loads. The total load of 3W is composed of two resistive 1.25W loads and a 0.5W load. The on-board programmer/debugger is powered up through the connection jack (J5) supplies power/connection. The Digital Power Starter Kit provides also closed-loop Peak Current Mode (PkCM) control using a 2-Pole, 2-Zero (2P2Z) compensator implemented in software to maintain the desired output voltage level of PkCM control and ensures stability during different line/load conditions. The LCD displays the voltage, current, temperature, and internal load setting and converter status of the kit. The functionality of the board also offers fault detection such as input over/under-voltage, over-temperature and soft-start on both buck and boost converter. These errors will be displayed on the LCD. The LCD refresh functions are called within the system idle routine. The routine refreshes the LCD screen based on both user input (SW1) and converter feedback (Fault flags/VIN measurement/converter output voltage).

The DSPIC33EP64GS502-I/SO can also be applied to power factor correction (PFC), resonant converters, half/full-bridge inverter, and resonant inverter.



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