STMicroelectronics 250W TRANSITION-MODE PFC PRE-REGULATOR WITH L6563S EVL6563S-250W EVL6563S-250W Data Sheet
Product codes
EVL6563S-250W
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.
output voltage remains at the peak of the input sinewave.
and
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.
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
with slow input voltage increasing -
full load
Figure 28.
EVL6563S-250W TM PFC: turn-off
with slow input voltage decreasing
- full load
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)