Using Single-Phase Online Design Calculator To Analyze Stability Of Interleaved Power Stage Designs

by David Baba, Texas Instruments, Chandler, Ariz., How2Power Today, Jul 15 2024

Focus:
Performing stability analysis on stacked, single-output, multiphase converter designs is more difficult than for a single-phase converter. That’s because online design calculators such as Texas Instruments’ Power Stage Designer, which generate Bode plots for assessing converter stability, are typically designed to work only with single-phase power stages. Consequently, the power supply designer must run simulations to determine loop response, and these simulations take more time. In this article, the author describes how to take a single-output multiphase design (based on the LM5148 controller) and modify it to a single-output, single-phase equivalent circuit, allowing loop stability to be analyzed using an online design calculator. Results are verified with SIMPLIS simulations.

What you’ll learn:

• How to use TI’s design calculators to perform stability analysis on interleaved, multiphase, buck converter designs
• How to converter a single-output, multiphase buck converter to its single-phase equivalent circuit

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