Datasheet

Test results and significant waveforms AN3119
12/32 Doc ID 16849 Rev 2
load range during operation at low mains. THD increases and PF decreases during
European mains operation at light load because the circuit begins working in burst mode to
maintain good efficiency, preventing from operating at a too high switching frequency. In a
case where the burst mode operation cannot be accepted a compromise with efficiency
must be found. The burst mode threshold can be slightly adjusted by modifying the multiplier
divider ratio and/or the compensation network.
The measured efficiency is shown in Figure 13, measured according to the ES-2
requirements. It is excellent at all load and line conditions; at full load it is always higher than
94 %, making this design suitable for high efficiency power supply. The average efficiency
calculated according to the ES-2 requirements at different nominal mains voltages is shown
in Figure 14.
Figure 11. EVL6563S-250W TM PFC: power
factor vs. output power
Figure 12. EVL6563S-250W TM PFC: THD vs.
output power
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Figure 13. EVL6563S-250W TM PFC:
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Figure 14. EVL6563S-250W TM PFC: average
efficiency acc. to ES-2
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