Current-Mode Control Stability Analysis For DC-DC Converters (Part 2)

Focus:

This article discusses current-mode control loop compensation for industrial and automotive applications. Starting from the small-signal model, simple expressions are derived that yield an intuitive procedure for designing the compensator for a current-mode-controlled buck converter. Even with an error amplifier of finite gain-bandwidth, the simplicity and convenience of this design procedure makes it viable for everyday use by the practicing power electronics engineer. To bolster the theoretical analysis, an actual design example based on a commercially available PWM regulator (the LM21305) is presented here with a SIMetrix/SIMPLIS simulation used to verify the results obtained from the aforementioned design procedure. The article begins by reviewing operation of a type 2 compensator.

What you’ll learn:

• How to design the type 2 compensation circuitry for a current-mode-controlled converter

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Author & Publication:

Timothy Hegarty, Silicon Valley Analog, Texas Instruments, Phoenix, Ariz., How2Power Today, Jul 15 2014

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