DER-94
LCD Monitor Internal Supply
September 12, 2005
10.3 Load Transient Response (75% to 100% Load Step)
In the figures shown below, the oscilloscope was triggered using the load current step as
a trigger source.
Figure 14 – Transient Response, 115 VAC, 75-100- Figure 15 – Transient Response, 230 VAC, 75-100-
75% Load Step on 5 V Output, 500 µs /
div. Top: 5 V Output, 50 mV / div.
Bottom: 5 V Load current, 1 A / div
75% Load Step on 5 V Output, 500 µs
/ div. Top: 5 V Output, 50 mV / div.
Bottom: Load Current, 1A / div.
10.4 Overvoltage Protection
Figure 16 – Overvoltage Protection Waveforms
with R15 shorted, 115 VAC Input,10
msec/div Top Trace: 12 V output, 2 V /
div Bottom Trace: 5 V Output, 2 V / div
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