STMicroelectronics 250W TRANSITION-MODE PFC PRE-REGULATOR WITH L6563S EVL6563S-250W EVL6563S-250W Scheda Tecnica
Codici prodotto
EVL6563S-250W
Test results and significant waveforms
AN3119
16/32
Doc ID 16849 Rev 2
voltage has a significant deviation from the nominal value. The circuit has the same behavior
in the case of mains surge at any input voltage, and it is not affected even if the input mains
surge happens at any point of the input sinewave.
in the case of mains surge at any input voltage, and it is not affected even if the input mains
surge happens at any point of the input sinewave.
In
the circuit behavior in the case of mains dip is shown; as previously described,
the internal circuitry has detected the decreasing of the mains voltage and it has activated
the C
the C
FF
internal fast discharge. As seen, in this case the output voltage changes but in a few
mains cycles it comes back to the nominal value. The situation is different if we compare it
with the performance of a controller without the V
with the performance of a controller without the V
FF
function. In
the behavior of a
PFC using the L6562A and delivering similar output power is shown; in the case of a mains
dip from 140 Vac to 90 Vac the output voltage variation is not very different but the output
voltage requires a longer time to restore the original value. In tests with a wider voltage
variation (e.g. 265 Vac to 90 Vac) the output voltage variation of a PFC without the voltage
feed-forward fast discharging is far more emphasized.
dip from 140 Vac to 90 Vac the output voltage variation is not very different but the output
voltage requires a longer time to restore the original value. In tests with a wider voltage
variation (e.g. 265 Vac to 90 Vac) the output voltage variation of a PFC without the voltage
feed-forward fast discharging is far more emphasized.
Figure 20.
L6562A input mains surge 90 Vac to
140 Vac - no V
140 Vac - no V
FF
input
Figure 21.
EVL6563S-250W TM PFC: input
mains surge 90 Vac to 140 Vac
mains surge 90 Vac to 140 Vac
CH1: Vout, CH2: MULT (pin #3), CH4: I_AC
CH1: Vout, CH3: V
FF
(pin #5), CH2: MULT (pin #3)
CH4: I_AC
Figure 22.
L6562A: input mains dip 140 Vac to
90 Vac - no V
90 Vac - no V
FF
input
Figure 23.
EVL6563S-250W TM PFC: input
mains dip 140 Vac to 90 Vac
mains dip 140 Vac to 90 Vac
CH1: Vout, CH2: MULT (pin #3), CH4: I_AC
CH1: Vout, CH2: MULT (pin #3), CH2: V
FF
(pin #5)
CH4: I_AC