DER-94
LCD Monitor Internal Supply
September 12, 2005
10 Waveforms
10.1 Drain Voltage and Current, Normal Operation
Figure 10 – 90 VAC, Full Load
Upper: VDRAIN, 200 V / div
Figure 11 – 265 VAC, Full Load
Upper: VDRAIN, 200 V / div
Lower: IDRAIN, 1 A, 5 us/div
Lower: IDRAIN, 1 A, 5 µs / div
10.2 Output Voltage Start-up Profile
Figure 12 – Start-up Profile, 90 VAC, 10 ms / div.
Top Trace – 12 V Output, 2 V / div
Figure 13 – Start-up Profile, 265 VAC, 10 ms / div.
Top Trace – 12 V Output, 2 V / div
Bottom Trace – 5 V Output, 2 V / div
Bottom Trace – 5 V Output, 2 V / div
Power Integrations
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