Current Mode-Controlled DC-DC Regulators (Part 2): Loop Compensation And Load Transient Performance

Focus:

This part 2 article examines loop compensation of current-mode dc-dc regulators, uncovering simple expressions derived from the small-signal model to yield an intuitive compensator design procedure applicable to single- and multiphase regulator circuits. The simplicity of the design procedure, even with an error amplifier of finite gain bandwidth, will make it convenient for everyday use. A design example using a commercially available two-phase synchronous buck controller (the LM5137F-Q1), along with circuit simulation in SIMPLIS in the time and frequency domains, will substantiate the theoretical analysis and demonstrate how to select values for the compensation network to achieve a target crossover frequency. The simulations will then reveal how a lower compensation capacitance helps reduce the output voltage settling time following a load current transient.

What you’ll learn:

• How to compensate single- and multi-phase, current-mode-controlled dc-dc converters

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Author & Publication:

Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Dec 15 2024

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