DER-55
TNY267 Multi Output Power Supply
April 20, 2005
9.4 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 15 – Transient Response, 230 VAC, 75-100- Figure 16 – Transient Response, 230 VAC, 75-100-
75% Load Step (5V Output).
Top: 5V Output
75% Load Step (3V3 Output)
Upper: 5V Output
Bottom: 3V3 Output
50 mV, 500 µs / div.
Bottom: 3V3 Output
50 mV, 2 ms / div.
Power Integrations
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