Functional check

AN3014

14/29

Doc ID 16064 Rev 2

Standby and no-load operation

In Figure 10 and Figure 11, some burst-mode waveforms are displayed. As illustrated, both

the L6599A and L6563H operate in burst-mode. In Figure 11 it can be observed that the

PFC and LLC bursts are synchronized.

In Figure 12 and Figure 13 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

controller. As visible in the images, both transitions are clean and there is no output voltage

Figure 8.

Secondary waveforms at

230 V - 50 Hz

Figure 9.

Startup sequencing at

230 V - 50 Hz

Figure 10.

No load operation at

230 V - 50 Hz

Figure 11.

No load operation - detail at

230 V - 50 Hz