EPR-33 Datasheet, PDF (22/32 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 33 - 45 W LCD Monitor External Power Supply using TOP247Y (TOPSwitch-GX)

EPR-33 – 45 W External Adapter Supply
28-Mar-2003
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 20 - 115 VAC Transient Response.
75%-100%-75% Load Step.
Top: Load Current, 2 A/div.
Bottom: Voltage at Supply Output
100 mV, 500 µs/div.
Figure 21 - 230 VAC Transient Response.
75%-100%-75% Load Step.
Top: Load Current, 2 A/div.
Bottom: Voltage at Supply Output
100 mV, 1 ms/div.
Figure 22 - 115 VAC Transient Response.
75%-100%-75% Load Step
at End of Cable.
Top: Load Current, 2 A/div.
Bottom: Voltage at End of Cable
100 mV, 500 µs/div.
Figure 23 - 230 VAC Transient Response
75%-100%-75% Load Step
at End of Cable.
Top: Load Current, 2 A/div.
Bottom: Voltage at End of Cable
100 mV, 1 ms/div.
Power Integrations, Inc.
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www.powerint.com
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