EPR-34 Datasheet, PDF (20/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 34 - Single Output 30 W AC-DC Power Supply

EPR-34 – 12 V, 30 W, Universal Input
10-Feb-2004
11.4 Load Transient Response (75% to 100% Load Step)
In the figures shown below, signal averaging was used to better enable viewing the load
transient response. The oscilloscope was triggered using the load current step as a
trigger source. Since the output switching and line frequency occur essentially at random
with respect to the load transient, contributions to the output ripple from these sources
will average out, leaving the contribution only from the load-step response.
Figure 18 – EP-34 Transient Response, 115 VAC,
75%-100%-75% Load Step.
Top: Load Current, 1 A/div.
Bottom: Output Voltage.
50 mV, 500 µs/div.
Figure 19 – EP-34 Transient Response, 230 VAC,
75%-100%-75% Load Step
Upper: Load Current, 1 A/div.
Bottom: Output Voltage.
50 mV, 2 ms/div.
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