EPR-71 Datasheet, PDF (16/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 71 - 6.6 W DC-DC Converter Using DPA Switch- (DPA423G)

EP-71 3.3 V, 2 A DC-DC Power Supply
10.2 Output Voltage Start-Up Profile
19-Jul-2005
Figure 13 - Start-up Profile, 36 VDC, No Load (Worst-
case).
Upper: V_OUT, 1 V / div.
Lower: V_DRAIN, 50 V, 10 ms / div.
Figure 14 - Start-up Profile, 57 VDC, No Load
(Worst-case).
Upper: V_OUT, 1 V / div.
Lower: V_DRAIN, 50 V, 10 ms / div.
10.3 Drain Voltage and Current Start-Up Profile
Figure 15 – 36 VDC Input, 2 A Resistive Load.
Upper: I_DRAIN, 0.5 A / div.
Lower: V_DRAIN, 100 V, 10 ms / div.
Figure 16 – 57 VDC Input, 2 A Resistive Load.
Upper: I_DRAIN, 0.5 A / div.
Lower: V_DRAIN, 100 V, 10 ms / div.
10.4 Load Transient Response (75% to 100% Load Step)
In the following two oscilloscope screen shots (Figure 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.
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