DER-50
Set Top Box Design using TOP245R
April 20, 2005
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 17 – Transient Response, 90 VAC, 60-100-
60% Load Step.
Figure 18 – Transient Response, 90 VAC, 60-100-
60% Load Step
Top: Load Current, 1 A/div.
Bottom: 3V3 Output Voltage
10 mV, 10 ms / div.
Upper: Load Current, 1 A/ div.
Bottom: 5V Output Voltage
10 mV, 10 ms / div.
Figure 19 – Transient Response, 90 VAC, 50-100-
50% Load Step.
Figure 20 – Transient Response, 90 VAC, 50-100-
50% Load Step
Top: Load Current, 0.5 A/div.
Bottom: 18V Output Voltage
10 mV, 10 ms / div.
Upper: Load Current, 0.5 A/ div.
Bottom: 23V Output Voltage
10 mV, 10 ms / div.
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