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| PFC / PWM Combination IC FA5533/34 Features Features *Critical mode Power Factor Correction and PWM are combined : suitable for smaller power supply *Internal start-up circuit with 500V rating and low frequency operation achieves 340mW input at no load when PFC stops. * Small Output Capacitance : Linearly reduced frequency for light load makes small ripple voltage. * PFC stops below half load ( only for FA5533 ) *Vcc rating 28V allows no series regulator for PW M_ FB LV Block Diagram Block Diagram COMP MUL AC under development under development PFC_ IS ZCD LIGHT_ LOAD ZCD ERR PFC_ FB + MUL R TIMER R 1shot Overvoltage detection OVP LV OVP S + - R Q RESTART UVLO PFC_ REG_ OK LIGHT_ LOAD UVLO_ AC PFC_ OUT PFC section UVLO_ AC + UVLO_ AC LIGHT_ LOAD UVLO_ VCC VCC START off + LV - - + PFC_ REG_ OK VH Common section REG_ PFC on - AC detect ACD PW M_ REG_ OK REG_ PW M on PWM section PW M_ REG Q VCO OSC FOSC PW M_ DELAY Dma PW M T Q CLR 1shot T S R Q auxiliary winding to clamp Vcc voltage. *Adjustable Soft Start time *Auto-Restart Over Load Protection *Auto-Restart Over-Voltage Protection for Vcc *Adjustable Start-up sequence for PFC and PWM: easy Full Load Start-up *Brown-Out below 70Vac and 70Vdc of PFC Output *16 pins package ( DIP/SO ) CS VCC PW M OVP slope + RESTART UVLO PW M_ REG_ OK LV UVLO_ AC PW M_ OUT + - + + + PW M VCC + RESTART PW M_ REG UVLO + LIGHT_ LOAD delay GND + Overload RESTART LIGHT_ LOAD PW M_ IS Usage : Notebook PC, LCD Monitor, LCD-TV, Laser Beam Printer etc. PFC / PWM Combination IC FA5533/34 Application Circuit Application Circuit under development under development PFC section PFC section PWM section PW M section PFC / PWM Combination IC FA5533/34 Timing Chart FA5533 Timing Chart ((FA5533 )) Heavy Load Light Load Heavy Load PFC Gate of PFC OUTPUT MOSFET (drive) under development under development Start-up ( Power-ON ) AC Line AC line voltage voltage Stop ( Power-OFF ) AC Line AC line voltage voltage PFC PFC output OUTPUT voltage voltage PW M Gate of PWM OUTPUT (drive) MOSFET VCC pin Vcc voltage voltage Vcc VCC pin voltage voltage PFC Gate of OUTPUT PFC (drive) MOSFET Gate of PFC OUTPUT PFC (drive) MOSFET PFC PFC output OUTPUT voltage voltage 0.5V PWM Output DC voltage OUTPUT Full load PFC PFC output OUTPUT voltage voltage Heavy Load Light load 70Vdc Light Load Full load Heavy Load CS pin CS voltage pin 0.5V PW M Gate of PWM OUTPUT (drive) MOSFET Gate of PWM PW M MOSFET (drive) OUTPUT PWMOutput DC voltage OUTPUT Output PWMvoltage DC OUTPUT 5m s 5ms |
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