AN4154

Operating waveforms

Doc ID 023578 Rev 2

11/21

5

Operating waveforms

The converter is operated at different mains conditions (refer to

Figure 5 and Figure 11),

starting from 90 to 450 Vac and the drain switching waveform and drain current waveforms

are captured at each line voltage at typical load conditions. Referring to

Figure 10, the peak-

to-peak voltage across the MOSFET is 775 V. It clearly indicates that there is a good safe

margin (=125 V) in operating the device even at worst line voltage 450 Vac and therefore it

confirms the reliable operation of the converter at high line operating conditions.

Figure 5.

Drain-source voltage and current at 90 Vac and typical load on all outputs

Figure 6.

Drain-source voltage and current at 150 Vac and typical load on all

outputs