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Digital Average Current Mode Control of Switch-Mode Power Supplies

by Andreas Reiter - Microchip Technology Average Current Mode Control (ACMC) of switch-mode power supplies has substantial, practical advantages over common Voltage Mode Control (VMC) or Peak Current Mode Control (PCMC) implementations in terms of robustness, reliability, and flexibility. Especially in dynamic applications, such as battery chargers, bidirectional converters, multiphase converters, PFC stages and inverters, ACMC solves key design challenges from low-level stability issues to high-level feature integration. However, the complex nature of this loosely coupled, non-serial cascaded feedback loop type requires proper analysis and a good understanding of its dependencies to prevent inner oscillations and hidden instability. This lecture guides through the design and configuration process of a digital ACMC implementation, showing how to tackle common challenges and how to avoid typical pitfalls.