Datasheet

Test results and significant waveforms AN3119
18/32 Doc ID 16849 Rev 2
Figure 26. EVL6563S-250W TM PFC: startup attempt at 80 Vac-60 Hz - full load
In Figure 26 a startup tentative below the threshold is shown. As seen, at startup the RUN
pin does not allow the PFC startup even if the Vcc has reached the turn-on threshold. PFC
output voltage remains at the peak of the input sinewave.
In Figure 27 and 28 the waveforms of the circuit during operation of brown-out protection are
shown. In both cases the mains voltage was increased or decreased slowly; as seen, both
at turn-on or turn-off there are no bouncing or starting attempts by the PFC converter.
CH1: PFC output voltage
CH2: Vcc voltage (pin #14)
CH3: RUN (pin #10)
CH4: gate drive (pin #13)
Figure 27. EVL6563S-250W TM PFC: startup
with slow input voltage increasing -
full load
Figure 28. EVL6563S-250W TM PFC: turn-off
with slow input voltage decreasing
- full load
CH1: PFC output voltage
CH2: gate drive (pin #13)
CH3: RUN (pin #10)
CH4: PWM_stop (pin #9)
CH1: PFC output voltage
CH2: gate drive (pin #13)
CH3: RUN (pin #10)
CH4: PWM_stop (pin #9)