Testing Transient Response In DC/DC Converters
by no author specified, Beta Dyne, Vendor website, Jan 23 2003
Focus:
This 9-page application note offers a practical guide to measuring the transient response of
dc-dc converters such as the dc-dc converter modules offered by this and other vendors. This
app note focuses mostly on testing of isolated dc-dc converters, including the variations
(single, dual, and triple output) but also includes some discussion on testing nonisolated
point-of-load converters with synchronous rectification. It begins by briefly explaining what
transient response is, why it’s important, and what factors contribute to the converter’s
transient response. Then, diagrams of basic test setups are presented with instruction on how
to apply them, followed by numerous example waveforms to illustrate the variations in transient
response (stable, unstable, overcompensated, undercompensated) under different types of load
steps. There is some explanation of the waveforms, relating the output voltage transitions back
to converter operation and the influence of factors such as output filter capacitance and
inductor saturation is discussed.
What you’ll learn:
- How to measure the transient response of dc-dc converters, particularly isolated converter modules
- How to interpret the results of transient response measurements on dc-dc converters
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