EPR-68 Datasheet, PDF (17/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 68 - 6.6 W DC-DC Flyback Converter Using DPA-Switch- (DPA423G)

19-Jul-2005
EP68 3.3 V, 2 A DC-DC Power Supply
10.4 Load Transient Response (75% to 100% Load Step)
In the following two oscilloscope screen shots (Figures 17 and 18), signal averaging was
used to more clearly capture the output voltage response to a load transient. Averaging
minimizes the appearance of the 400 kHz switching ripple in the output voltage scope
plot. The load current step was used to trigger the horizontal sweep of the oscilloscope.
Figure 17 - Transient Response,
36 VDC, 75-100-75% Load Step.
Top: Load Current, 1 A / div.
Bottom: Output Voltage,
20 mV, 500 µs / div.
Figure 18 - Transient Response,
57 VDC, 75-100-75% Load Step.
Top: Load Current, 1 A / div.
Bottom: Output Voltage,
20 mV, 500 µs / div.
Page 17 of 28
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