Easy Calculation Yields Load Transient Response

by 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

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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