Easy Calculation Yields Load Transient Response

Focus:

A power supply's load-step transient response can be approximated as the power supply output impedance at its crossover frequency times the magnitude of the load step. The choice of current-mode or voltage-mode control influences output impedance and thereby affects transient response. The requirement for output filter capacitance or ESR can be calculated easily from the transient load-step requirement and estimation of loop-crossover frequency.

What you’ll learn:

• How to calculate a power converter's requirement for output capacitance and bandwidth based on the desired transient response.
• How to understand the influence of current-mode versus voltage-mode control on load transient response

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Author & Publication:

John Betten, Application Engineer and Member of Group Technical Staff, and Robert Kollman, Distinguished Member of Technical Staff, Texas Instruments, Dallas, Power Electronics Technology, Feb 01 2005

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