Current Mode-Controlled DC-DC Regulators (Part 2): Loop Compensation And Load Transient Performance
by Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Dec 15 2024
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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