Functional check

AN2690

12/31

In Figure 10 and 11 the transitions from full load to no load and vice versa at maximum input

voltage have been checked. The maximum input voltage has been chosen because it is the

most critical input voltage for transition. In fact at no load the burst pulses have the lower

or restarting attempt that could affect the proper power supply operation.

Figure 8.

EVL6566-75WADP no-load

operation waveforms at 90 V-60 Hz

Figure 9.

EVL6566-75WADP no-load

operation waveforms at 265 V-50 Hz

CH1: Drain voltage

CH3: COMP pin voltage

CH1: Drain voltage

CH3: COMP pin voltage

Figure 10.

EVL6566-75WADP transition full

Figure 11.

EVL6566-75WADP transition no

CH1: Drain voltage

CH3: Output voltage

CH4: Output current

CH1: Drain voltage

CH3: Output voltage

CH4: Output current