Current Mode-Controlled DC-DC Regulators (Part 3): CC-CV Regulation

Focus:

This article examines a constant-current, constant-voltage (CC-CV) dual-loop architecture for a dc-dc regulator. The author outlines existing designs for the CC circuit that work as an add-on to a conventional dc-dc regulator. He then details a CC-CV integrated circuit (IC) approach with low external component count, reduced cost, accurate current-setpoint performance and improved transient response. The IC implementation is unique in that it selects the minimum of the currents from the transconductance error amplifiers in the CV and CC loops. This error current then flows in a shared compensation component network, the resultant compensation voltage becoming the reference command of the inner current loop of the current-mode architecture. Simulation results of the CV and CC loops, and a laboratory testbed based on a commercially available CC-CV synchronous buck controller (the LM5190-Q1) illustrate the performance characteristics of the dual-loop architecture.

What you’ll learn:

• How to implement a CC-CV dual-loop architecture for a dc-dc regulator with a shared compensation network for the two control loops
• How to implement CC-CV control using the LM5190 synchronous buck controller for charging batteries and supercaps

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Author & Publication:

Timothy Hegarty, Texas Instruments, Phoenix, Ariz., How2Power Today, Feb 14 2025

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