EVL6563H-100W 데이터 시트보기 (PDF) - STMicroelectronics

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EVL6563H-100W

250 W transition-mode PFC pre-regulator with the new L6563H

STMicroelectronics 

Test results and significant waveforms

AN3118

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 if the input mains surge happens at any point of the input

sinewave.

Figure 20. L6562A input mains surge 90 Vac to Figure 21. EVL6563H-250W TM PFC input

140 Vac - no VFF input

mains surge 90 Vac to 140 Vac

CH1: Vout, CH2: MULT (pin #3), CH4: I_AC

CH1: Vout, CH3: VFF (pin #5), CH2: MULT (pin #3)

CH4: I_AC

In Figure 23 the circuit behavior in case of mains dip is shown; as previously described, the

internal circuitry has detected the decrease of the mains voltage and it has activated the

CFF internal fast discharge. As seen, in this case the output voltage changes but in a few

mains cycles it returns to the nominal value. The situation is different if we compare it with

the performance of a controller without the VFF function. In Figure 22, the behavior of a PFC

using the L6562A 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 much more emphasized.

Figure 22. L6562A: input mains dip 140 Vac to Figure 23. EVL6563H-250W TM PFC input

90 Vac - no VFF input

mains dip 140 Vac to 90 Vac

CH1: Vout, CH2: MULT (pin #3), CH4: I_AC

CH1: Vout, CH2: MULT (pin #3), CH3: VFF (pin #5), CH4: I_AC

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Doc ID 16847 Rev 2

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