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PFC / PWM Combination IC FA5533/34
TTiimmiinnggCChhaarrtt((FFAA55553333))
uunnddeerrddeevveellooppmmeenntt
Heavy Load → Light Load → Heavy Load
Gate of PPFFCC
MOSOF(UdETriTvPeU)T
AC Line
AC line
voltavoglteage
Start-up ( Power-ON )
PFC PFC
output
OUTPvUoltTage
voltage
Gate of PWPWMM
OUTPUT
MOSF(dEriTve)
PWM ODuCtput
OUTPvUoltTage
Full load
Heavy
Load
Light load
Light
Load
VCC pVicnc
voltavoglteage
GaOtUePTFPoCUf T
P(dFrivCe)
MOSFET
Full load
Heavy
Load
PFC PFC
OUTPoUutTput
voltagveoltage
CS pin
voltagCeS pin 0.50V.5V →
Gate of PWPWMM
OUTPUT
MOSF(dEriTve)
Stop ( Power-OFF )
AC Line
voltaAvogCltealign
e
e
VCC pVincc
voltavoglteage
GatePFoCf
OPUFTPCUT
MOS(FdErivTe)
PFC PFC
OUTPoUutpTut
voltagvoeltage
70Vdc
Gate of PWPWMM
OUTPUT
MOSF(dEriTve)
PWMODutCput
OUTPvoUltaTge
PWMODutCput
voltage
OUTPUT
5ms
5ms