DSCs Ease Migration to Digital Loop Control

Focus:

With their high execution rates, availability of on-chip power peripherals, and microcontroller-like ease-of-use, digital signal controllers (DSCs) make it easier for designers to switch from conventional analog loop control to the more-versatile digital loop control. This article explains the factors that must be considered when selecting a DSC to implement a power supply design. A DSC-based synchronous buck converter design is used to illustrate the principles discussed here, but the use of other topologies is briefly alluded to. Calculation of control loop delay is described and considerations relating to use of the PID algorithm are discussed. As part of the example synchronous buck design, the article provides a code listing for implementation of a PID algorithm on a PIC DSC, a compressed file with source listings, a hex file, Gerber files, and a bill of materials.

What you’ll learn:

• How to select a DSC for a digitally controlled power supply design
• How to design a DSC-based synchronous buck converter

Notes:

Article appeared in PET's November 2006 supplement on Digital Control.

View the Source

Author & Publication:

Bryan Kris, Staff Architect, Architecture & Applications, Digital Signal Controller Division, Microchip Technology, Phoenix, Power Electronics Technology, Nov 01 2006

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