DER-120
Triple Output Flyback – DPA424R
October 26, 2005
10.3 Load Transient Response (0.75 A to 2 A 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.
+9 V and +24 V Loads were set to maximum.
Figure 14 – Transient Response
Top: Load Current; 1 A/div.
Bottom: +3.3 V Output
100 mV, 1ms/div.
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